14 ms·

I think everyone was a txt file on their computer filled with FFmpeg commands. Care to share yours?

by godmode2019 6y ago

rimliu 6y ago
I have none. But I do gave HandBrake installed.
- edflsafoiewq 6y ago
  I always grep for ffmpeg in .bash_history.
  - m463 6y ago
    I use control-r very often.
bejelentkezni 6y ago
All I have that I'm not seeing elsewhere in the replies is: ffmpeg -r 1 -loop 1 -i 1.png -i 1.wav -c:v libvpx -c:a libvorbis -b:a 64k -shortest out.webm (clearly this is old) -max_muxing_queue_size 2048 (magically fixes some errors and microscopically increases quality, a no-brainer on machines with more than token amounts of RAM)
ducktective 6y ago
There is tldr: https://github.com/tldr-pages/tldr/blob/master/pages/common/ffmpeg.md https://github.com/tldr-pages/tldr/blob/master/pages/common/...
Ndymium 6y ago
Here's one I wrote a blog post[0] about on how to merge two audio tracks of a video into one track without re-encoding the video: ffmpeg -i 'input.mkv' -filter_complex '[0:a:1]volume=0.1[l];[0:a:0][l]amerge=inputs=2[a]' -map '0:v:0' -map '[a]' -c:v copy -c:a libmp3lame -q:a 3 -ac 2 'output.mp4' [0] https://blog.nytsoi.net/2017/12/31/ffmpeg-combining-audio-tracks https://blog.nytsoi.net/2017/12/31/ffmpeg-combining-audio-tr...
cm2187 6y ago
mine: h264: -c:v libx264 -preset medium -crf 22 h265: -c:v libx265 -preset medium -crf 26 no recompress: -c copy presets: ultrafast,superfast, faster, fast, medium, slow, slower, veryslow desinterlace: -vf yadif target size: -s 1920x1080 aspect ratio without recompressing: -aspect 16:9 rotate video: -vf "transpose=1" 0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip rotate without recompressing: -metadata:s:v rotate="90" audio aac two channels: -c:a aac -b:a 160k -ac 2 web fast start: -movflags +faststart autoscale to WxH with black bands: -vf "scale=W:H:force_original_aspect_ratio=decrease,pad=W:H:(ow-iw)/2:(oh-ih)/2" get jpeg snapshot: -vframes 1 -q:v 2 dest.jpg concatenate mp4 without recompressing: -f concat -safe 0 -i "files.txt" -c copy -movflags +faststart files.txt format: file 'filepath' ffprobe get videoinfo: ffprobe -v quiet -print_format xml -show_format -show_streams "filepath" > file.xml if override which sub track is default, use "-default_mode infer_no_subs" clear disposition (default sub): -disposition:s 0 default or forced disposition: -disposition:s forced track metadata (audio): -metadata:s:a title="xx" track metadata (video): -metadata:s:v title="xx" global metadata: -metadata title="xx" -metadata description="xx" -metadata comment="xx" extract sound from video to mp4 ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 sound.mp3 skip time (place after input file): -ss 00:05:00 stop after: -t 00:05:00 Approx fast seek (place before input file): -ss 00:05:00 -noaccurate_seek -i ....
- BigBalli 6y ago
  If you place -ss after the input file it will take longer. For true seek place -ss before -i.
  - rainbowzootsuit 6y ago
    It will only approximately seek to a te using GOP i-frames if you do -ss before -i which in MPEG2 is generally ~15frames=0.5s. But a GOP can be pretty long, like 30s, in MPEG4. https://ottverse.com/trim-cut-video-using-start-endtime-reencoding-ffmpeg/ https://ottverse.com/trim-cut-video-using-start-endtime-reen...
puzzlingcaptcha 6y ago
I only have one, and it's for a rather niche use: fixing incorrect or missing h264/h265 bitstream metadata without re-encoding, for example: ffmpeg -i source.avc -c copy -bsf:v h264_metadata=colour_primaries=1:matrix_coefficients=1 output.h264 https://ffmpeg.org/ffmpeg-bitstream-filters.html#h264_005fmetadata https://ffmpeg.org/ffmpeg-bitstream-filters.html#h264_005fme... https://www.itu.int/rec/T-REC-H.264-201906-I/en https://www.itu.int/rec/T-REC-H.264-201906-I/en
cooper12 6y ago
ffmpeg -i foo.mp4 -c:v h264_videotoolbox -b:v 1600k foo_out.mp4 On macOS, this uses hardware acceleration to reencode a video at a lower bitrate. My macbook is from 2012, so this does make a notable difference. There's also "hevc_videotoolbox" for H.265 if your machine supports it.
- izacus 6y ago
  It will also significantly tank the quality (HW encoders are horrible at quality-per-bit ratio) - libx264 at this bitrate will make a huge difference in how good the video will look.
eXpl0it3r 6y ago
Video to GIF SET filters="fps=%4,scale=%3:-1:flags=lanczos" ffmpeg -v warning -i %1 -vf "%filters%,palettegen" -y palette.png ffmpeg -v warning -i %1 -i palette.png -lavfi "%filters% \[x\]; \[x\]\[1:v\] paletteuse" -y %2 DEL palette.png togif.bat <input.mp4> <output.gif> <width> <fps> Extract audio from a video ffmpeg -i "path\to\my_input_video_file.mp4" "path\to\my_output_audio_only.wav" Extract specific video and audio stream ffmpeg -i "path\to\my_input_video_file.mp4" -map 0:0 -c copy video.mp4 -map 0:1 -c copy audio0.m4a -map 0:2 -c copy audio1.m4a Concatenate two or more video clips (echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4 Convert 10-bit H.265 to 10-bit H.264 ffmpeg -i input -c:v libx264 -crf 18 -c:a copy output.mkv Convert 10-bit H.265 to 8-bit H.265 ffmpeg -i input -c:v libx265 -vf format=yuv420p -c:a copy output.mkv Convert 10-bit H.265 to 8-bit H.264 ffmpeg -i input -c:v libx264 -crf 18 -vf format=yuv420p -c:a copy output.mkv
- jscholes 6y ago
  > Extract audio from a video If you use `-vn` and `-acodec copy` (I use both although not sure `-vn` is strictly necessary), you can demux the audio from the video in the same format it is already in. Of course, you're extracting to wav so not transcoding, but copying may be faster/use less space.
- joshspankit 6y ago
  > Extract audio from a video In my opinion, `ffmpeg -i filename.mp4 filename.wav` is one of the greatest known examples of powerful functionality with a simple interface.
paol 6y ago
Gladly. There's even some relatively advanced stuff in there: # Save a RTSP stream to file ffmpeg -i rtps://someserver/somevideo -c copy out.mp4 # encoding quality settings examples # H264 ffmpeg -i input.mp4 -a:c copy -c:v libx264 -crf 22 -preset slower -tune film -profile:v high -level 4.1 output.mp4 # H264 10bit (must switch to a different libx264 version) LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/x264-10bit ffmpeg -i input.mp4 -a:c copy -c:v libx264 -crf 22 -preset slower -tune film -pix_fmt yuv420p10le -profile:v high10 -level 5.0 output.mp4 # resize ffmpeg -i in.mp4 -s 480x270 -c:v libx264 out.mp4 # change source fps ffmpeg -r 10 -i in.mp4 out.mp4 # resample fps ffmpeg -i in.mp4 -r 10 out.mp4 # extract the audio from a video ffmpeg -i inputfile.mp4 -vn -codec:a copy outputfile.m4a # merge audio and video files ffmpeg -i inputfile.mp4 -i inputfile.m4a -codec copy outputfile.mp4 # cut (reencoding) # set the start time and duration as HH:MM:SS ffmpeg -ss 00:00:40.000 -i input.mp4 -t 00:00:10 -c:v libx264 output.mp4 # set the start time and duration as seconds ffmpeg -ss 40.0 -i input.mp4 -t 10.0 -c:v libx264 output.mp4 # skip an exact number of frames at the start (100) ffmpeg -i input.mp4 -vf 'select=gte(n\,100)' -c:v libx264 output.mp4 # cut (w/o reencoding - cut times will be approximate) ffmpeg -ss 40.0 -i input.mp4 -t 10.0 -c copy output.mp4 # save all keyframes to images ffmpeg -i video.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr video-%03d.png # encode video from images (image numbering must be sequential) ffmpeg -r 25 -i image_%04d.jpg -vcodec libx264 timelapse.mp4 # flip image horizontally ffmpeg -i input.mp4 -vf hflip -c:v libx264 output.mp4 # crop and concatenate 3 videos vertically ffmpeg -i cam_4.mp4 -i cam_5.mp4 -i cam_6.mp4 -filter_complex "[0:v]crop=1296:432:0:200[c0];[1:v]crop=1296:432:0:200[c1];[2:v]crop=1296:432:0:230[c2];[c0][c1][c2]vstack=inputs=3[out]" -map "[out]" out.mp4 # 2x2 mosaic (all inputs must be same size) ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -i video4.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[row1];[2:v][3:v]hstack=inputs=2[row2];[row1][row2]vstack=inputs=2[out]" -map "[out]" out.mp4 # picture-in-picture ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[1:v]scale=iw/3:ih/3[pip];[0:v][pip]overlay=main_w-overlay_w-20:main_h-overlay_h-20[out]" -map "[out]" out.mp4 # print framerate of every file in dir for f in *.mp4; do echo $f; mediainfo $f|grep "Frame rate"; done # print selected info of every file in dir in CSV format for f in *.mp4; do echo -n $f,; mediainfo --Inform="Video;%Duration%,%FrameCount%,%FrameRate%" $f; done
- hivacruz 6y ago
jonplackett 6y ago
-pix_fmt yuv420p Every damn time I have to export from after effects and need a file I can actually open.
bambax 6y ago
Here are two not present in the comments so far. Print subtitles (useful for old TVs that can't select a subtitle from streams or files; I use this to get my kids to watch movies in English): -vf "ass=subtitle.ass" or with .srt and in a huge yellow font -vf "subtitles=subtitles.srt:force_style='Fontsize=36,PrimaryColour=&H0000FFFF'" Extract 1 second of video every 90 seconds (if you have very long footage of a trip from a dashcam and you don't know what to do with it, that makes for a much shorter "souvenir"): -vf "select='lt(mod(t,90),1)',setpts=N/FRAME_RATE/TB" -af "aselect='lt(mod(t,90),1)',asetpts=N/SR/TB"
pchm 6y ago
mov2gif: ffmpeg -i input.mov -vf "fps=10,scale=600:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif
mjaniczek 6y ago
function grab-screen-lossless { ffmpeg -an -f x11grab -video_size 1920x1080 -framerate 60 -i :0.0 -c:v h264_nvenc -preset llhq -tune zerolatency -crf 0 -qp 0 "${1}" } function grab-screen { ffmpeg -an -f x11grab -video_size 1920x1080 -framerate 60 -i :0.0 -c:v h264_nvenc -preset llhq -tune zerolatency -qp 10 "${1}" } function vid_compress { ffmpeg -i "${1}" -codec:v libx264 -preset:v fast -pix_fmt yuv420p "${2}" }
- superasn 6y ago
  Wow never realized ffmpeg could be used like this! Unfortunately both these commands create a somewhat jerky video on my rx 550 on linux mint and drives CPU crazy (ryzen 3500). I guess it's my underpowered graphics card, but any way to tweak your grab-screen-lossless for a smoother capture?
  - zerocrates 6y ago
    I'm surprised those specific commands work at all on your machine, since they use the Nvidia-specific nvenc.
    - superasn 6y ago
      probably because i habe a gt 710 in the second slot for driving my 4 monitor setup. also it could be the reason why the capture is so choppy.
    - superasn 6y ago
      Also I tried with -vcodec huffyuv after searching the internet, but no change in performace :/
stevens37 6y ago
slow down by 10x (gopro 240fps to 24fps) ffmpeg -i ${1} -sn -an -c:v libx264 -r 24 -filter:v "setpts=10PTS" -crf 19 ${1}-10x.mkv reverse video ffmpeg -i $IFILE -s 3840x2160 -f image2 -q:v 1 -vf format=yuvj420p $tmpdir/p%8d.jpg cat $(ls -t $tmpdir/p.jpg) | ffmpeg -f image2pipe -c:v mjpeg -r 30 -i - -c:v libx264 -crf 18 -vf format=yuv420p -preset slow -f mp4 $OFILE loop a video: loopcount=$1 ffmpeg -stream_loop $1 -i $2 -c copy $3.mkv
hanselot 6y ago
I use various scripts, not a single file. This one I call recorder which I use to record meetings. ffmpeg -video_size 3840x1080 -framerate 25 -f x11grab -i :0.0+0,0 -f pulse -ac 2 -i default $1.mkv resolution needs to be adjusted for your setup
captn3m0 6y ago
avi2gif: ffmpeg -i $1 -vf scale=320:-1:flags=lanczos,fps=10 /tmp/frames/ffout%03d.png convert -loop 0 /tmp/frames/ffout*.png $1.gif flac2mp3 parallel-moreutils -i -j$(nproc) ffmpeg -i {} -qscale:a 0 {}.mp3 -- ./*.flac rename .flac.mp3 .mp3 ./*.mp3 screencast TIMESTAMP=`date +"%Y-%m-%d_%H"` TMP_AVI=$(mktemp /tmp/outXXXXXXXXXX.avi) ffcast -s % ffmpeg -y -f x11grab -show_region 1 -framerate 15 \ -video_size %s -i %D+%c -codec:v huffyuv \ -vf crop="iw-mod(iw\\,2):ih-mod(ih\\,2)" $TMP_AVI \ && convert -set delay 10 -layers Optimize $TMP_AVI /home/nemo/Desktop/GIFs/$TIMESTAMP.gif split-audio-by-chapters[0] to split a audiobook from Audible to multiple files by chapters. split-by-audible[1] to split a audiobook from Audible to multiple files by chapters using the copied timestamps from the Audible Web Player. split-by-silence[2] to split audiobooks by Silence instead audiobook2video[3] to generate a video file from audiobooks. Puts up a nice cover. [0]:https://github.com/captn3m0/Scripts/blob/master/split-audio-by-chapters https://github.com/captn3m0/Scripts/blob/master/split-audio-... [1]: https://github.com/captn3m0/Scripts/blob/master/split-by-audible https://github.com/captn3m0/Scripts/blob/master/split-by-aud... [2]: https://github.com/captn3m0/Scripts/blob/master/split-by-silence https://github.com/captn3m0/Scripts/blob/master/split-by-sil... [3]: https://github.com/captn3m0/Scripts/blob/master/audiobook2video https://github.com/captn3m0/Scripts/blob/master/audiobook2vi...
slazaro 6y ago
Cut ffmpeg video without losing quality by keeping the same codecs, very fast: Example: Start at 52 seconds, take 10 minutes after that: ffmpeg -ss 52 -i input.mp4 -c copy -t 00:10:00.0 output.mp4
krisgenre 6y ago
Convert AVI to MP4 ---------------------------- ffmpeg -i input.avi -c:v libx264 -crf 19 -preset slow -c:a libvo_aacenc -b:a 192k -ac 2 out.mp4 Convert MP4 to GIF --------------------------- mkdir frames ffmpeg -i video.mp4 -r 5 'frames/frame-%03d.jpg' cd frames convert -delay 20 -loop 0 -layers Optimize *.jpg myimage.gif
rpastuszak 6y ago
Here's one that generates AppStore previews with correct sizes and metadata. (iTunes Connect can be really picky about this sometimes.) # 1. Record your device using QuickTime # (File->New Movie Recording->Select your phone) # 2. Run `$ app-preview your-recording.mov` function app-preview() { echo "name $1" ffmpeg -i $1 -vf scale=1080:1920,setsar=1 -c:a copy "out_$1" }
Ciantic 6y ago
I have one glorious: ffmpeg -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf "hwdownload,format=nv12,scale=(iw*sar)*max(1280/(iw*sar)\,720/ih):ih*max(1280/(iw*sar)\,720/ih), crop=1280:720, subtitles=input.srt:force_style='FontName='TiresiasScreenfont',Fontsize=32,Outline=2,MarginL=50,MarginV=30,Alignment=1',minterpolate=fps=60:mi_mode=blend" -c:v h264_nvenc -preset slow -b:v 8M -f matroska - | vlc - What it does: Allows streaming content to Chrome Cast with my idea of subtitles through VLC. For me I want subtitles with Tiresias screen font used in Finnish YLE 90s. (Aligned always to left second row, so that starting point is always the same. Center alignment is bad because you need to always re-adjust eyes to the position where the subtitles start, left alignment makes the first character always in same place.) * `hwaccel cuvid -c:v h264_cuvid` * makes the hardware accelerated decoding (h264 only) * `-vf` * video filter * `hwdownload,format=nv12` * downloads the hardware accelerated frame to memory for the video filter (required by cuvid) * `scale=(iwsar)max(1280/(iwsar)\,720/ih):ihmax(1280/(iw*sar)\,720/ih), crop=1280:720` * crops the video to 1280x720, (exteremely high impact on performance!) Use crop and resize cuvid below for better performance. * `subtitles=input.srt:force_style='FontName='TiresiasScreenfont',Fontsize=32,Outline=2,MarginL=50,MarginV=30,Alignment=1'` * subtitles * `-c:v h264_nvenc -preset slow -b:v 8M` * hardware accelerated encoding 8000 kb/s for 720p/60 (for 1080p use `16M`) * `-f matroska * | vlc -` * output as matroska, pipe to VLC * `minterpolate=fps=60:mi_mode=blend` * output 60 fps interpolate blending (this can cause problems, avoid sometimes) Crop and resize with cuvid example: * `-hwaccel cuvid -crop 0x0x200x200` - faster way to crop top x bottom x left x right * `-hwaccel cuvid -resize 1200x300` - resize (forces the size) Seek example: Seek to 30 minutes (60*30 = 1800) ffmpeg -ss 1800 ... vf "hwdownload,format=nv12,setpts=PTS+1800/TB,subtitles='...',setpts=PTS-STARTPTS"`
- nathancahill 6y ago
  Been following the VLC subtitles/Chromecast issue for several years now. Thank you so much for this!
- VilleSalonen 6y ago
  According to Yle they only started using Tiresias in 2012. The article doesn't mention which font they were using before. I would be interested in their 90s font as well. Source: https://yle.fi/aihe/artikkeli/2012/01/27/televisiokanavien-tekstitysfontti-vaihtuu-eika-se-ole-comic-sans https://yle.fi/aihe/artikkeli/2012/01/27/televisiokanavien-t...
m463 6y ago
I wonder if ffmpeg should have a scripting language and/or repl
abrowne 6y ago
Convert all FLAC files in the directory to MP3s, in parallel using fd: fd -t f -e flac . "$@" -x ffmpeg -loglevel 16 -i "{}" -qscale:a 0 "{.}.mp3"
mnw21cam 6y ago
I wrote a command-line based video editing tool as a 300-line bash script. It reads a list of segments of video (source file, start position, length) to string together (including options such as image overlay, fade, fast forward, slow motion, static image) from a text file, and converts it into a Makefile with ffmpeg commands in it, which you can then run with whatever level of parallelism you wish. It treats the video and sound separately, and creates a video and sound file for each segment, using concatenatable formats for both. Then the final few make targets are to concatenate the video into one file, the sound into another file, and then multiplex them into a single file. Used it a few times for editing my own videos. It's a bit big to share here though.
lgeorget 6y ago
$cat ~/bin/ffmpeg_grab_desktop.sh #!/bin/bash size=${1:-"1920x1080"} offset=${2:-"0,0"} name=${3:-"video"} ffmpeg -video_size $size -framerate 25 -f x11grab -i :0.0+$offset -c:v libx264 -crf 0 -preset ultrafast "$name.mkv" ffmpeg -i "$name.mkv" -movflags faststart -pix_fmt yuv420p "$name.mp4"
snowbrook 6y ago
Test patterns: ffmpeg -f lavfi -i testsrc=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-testsrc.mp4 ffmpeg -f lavfi -i testsrc2=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-testsrc.mp4 ffmpeg -f lavfi -i smptebars=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-smptebars.mp4
tootie 6y ago
I store my list of ffmpeg shortcuts on a website called StackOverflow
dkarp 6y ago
Downmixes audio on movies from surround sound to stereo balanced for night watching (prevents audio being too quiet) so that they can direct stream on my devices ffmpeg -hide_banner -loglevel error -nostdin -y -i "$f" -map 0:0 -c:v copy -map 0:a:0? -c:a:0 aac -b:a:0 160k -filter:a:0 "pan=stereo|FL=1.414*FC+0.707*FL+0.5*FLC+0.5*BL+0.5*SL+0.5*LFE|FR=1.414*FC+0.707*FR+0.5*FRC+0.5*BR+0.5*SR+0.5*LFE,acompressor=ratio=4" -metadata:s:a:0 title="NightMixed" -metadata:s:a:0 language=eng -disposition:a:0 default -map 0:a:0? -c:a:1 copy -disposition:a:1 none -map 0:a:1? -c:a:2 copy -disposition:a:2 none -map 0:a:2? -c:a:3 copy -disposition:a:3 none -map 0:a:3? -c:a:4 copy -disposition:a:4 none -map 0:a:4? -c:a:5 copy -disposition:a:5 none -map 0:a:5? -c:a:6 copy -disposition:a:6 none -map 0:a:6? -c:a:7 copy -disposition:a:7 none -map 0:a:7? -c:a:8 copy -disposition:a:8 none -map 0:a:8? -c:a:9 copy -disposition:a:9 none -map 0:s:0? -c:s:0 copy -map 0:s:1? -c:s:1 copy -map 0:s:2? -c:s:2 copy -map 0:s:3? -c:s:3 copy -map 0:s:4? -c:s:4 copy -map 0:s:5? -c:s:5 copy -map 0:s:6? -c:s:6 copy -map 0:s:7? -c:s:7 copy -map 0:s:8? -c:s:8 copy -map 0:s:9? -c:s:9 copy "/home/pi/media/remixed_in_progress/$f"
- lloeki 6y ago
  Goddammit I can't believe how downmixing x.y to 2.0 isn't a solved problem by now and is so broken through and through. I mean, it's never ever done in a way that doesn't produce quiet dialog that makes you raise volume and loud sounds that makes your eardrums bleed. Like, even basic audio normalisation would produce half-decent results, but no we get crazy contrast by default and constant volume switching.
  - dkarp 6y ago
    The interesting part is that most media is being consumed with stereo audio down-mixing. Everyone streaming content on their laptops, with their television's speakers or with a sound bar. Yet all the audio is recorded and mastered for surround sound systems, even though they could include mastered stereo audio without the down-mixing issues like quiet audio.
b1gtuna 6y ago
Here is mine. To screen capture every 600 frames: ffmpeg -i my_vid.mp4 -vf "select=not(mod(n\,600))" -vsync vfr -q:v 15 img_%03d.jpg To make a montage that's 1024 px wide: for d in \* do (montage -mode concatenate -tile 4x -resize 1024x $d"/\* "$d".jpg) done
donatj 6y ago
Very Carefully Rebuild a Video # H264 $ ffmpeg -i input.avi -c copy -c:v libx264 -crf 18 -preset slow output.mkv # H265 -c:v libx265 -crf 22 Append Subtitles $ ffmpeg -i input.mkv -i input.srt -map 0 -map 1 -c copy output.mkv Concat Videos $ ls *.mkv > mylist.txt $ vim mylist.txt # append each line with "file " $ ffmpeg -f concat -i mylist.txt -c copy merged-pre-subbed.mkv Probe size issues? $ ffmpeg -analyzeduration 2147483647 -probesize 2147483647 ... Deinterlace -vf yadif Metadata Examples ffmpeg -i foo.avi -i commentary.mp3 -map 0 -map 1 -c:a copy -c:v libx264 -crf 18 -preset fast -metadata:s:a:1 title="Commentary" -metadata:s:a:0 language=eng funk.mkv Autocrop $ ffplay -i foo.mkv -vf "cropdetect=24:16:0" <let it run for a minute> [Parsed_cropdetect_0 @ 0x7ff093c65c00] x1:0 x2:1919 y1:132 y2:947 w:1920 h:816 x:0 y:132 pts:30155 t:30.155000 crop=1920:816:0:132 -filter:v:0 "crop=1920:816:0:132"
yakubin 6y ago
Annotate video with frame numbers: ffmpeg -i input.mp4 -vf "drawtext=fontfile=font.ttf: text=%{n}: x=48: y=48: fontcolor=white: box=1: boxcolor=0x00000099: fontsize=72" -y output.mp4 Remove audio track from video: ffmpeg -i input.mp4 -c copy -an output.mp4
nsajko 6y ago
Not an ffmpeg wizard here, but here are my screencasting commands. Probably the most useful knowledge in this snippet is how to use Alsa from ffmpeg; i.e., Alsa devices can be referred to as hw:0, hw:1, etc; and one finds out which device to use from arecord. # Example output file. f=/tmp/output.mp4 # Example video resolution. g=1920x1080 # Example capture framerate fr=4 # Example X11 display d=$DISPLAY # Simple screencast. # # Try adjusting the libx264 CRF from 15 to some greater number, as long # as there is no visible effect on video quality. # # If increasing the capture framerate, you may also wish to use a # faster preset. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -i "$d" \ -c:v libx264 -crf 15 -preset veryslow "$f" # Simple screencast without drawing the pointer/cursor. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -draw_mouse 0 -i "$d" \ -c:v libx264 -crf 15 -preset veryslow "$f" # See what devices are available for capturing sound. arecord -l # Select a device. audioCaptureDevice=hw:0 # List some permitted parameters associated with device 0. # # We are interested in the "FORMAT", "CHANNELS", and "RATE" parameters # for use in the ffmpeg command. arecord --dump-hw-params -D "$audioCaptureDevice" audioSampleFormat=pcm_s32le audioNumChannels=2 audioRate=44100 f=/tmp/output.mp3 # Record sound. ffmpeg -thread_queue_size 8192 -f alsa -channels "$audioNumChannels" -sample_rate "$audioRate" \ -c:a "$audioSampleFormat" -ar "$audioRate" -i "$audioCaptureDevice" "$f" f=/tmp/output.mkv # Screencast with sound. # # Note that there seems to be an FFMPEG bug where the audio in the last # 15 seconds of the video is cut off. The workaround is to record for # 15 exrtra seconds, and then cut the extra video. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -i "$d" \ -thread_queue_size 8192 -f alsa -channels "$audioNumChannels" -sample_rate "$audioRate" \ -c:a "$audioSampleFormat" -ar "$audioRate" -i "$audioCaptureDevice" \ -c:a flac -c:v libx264 -crf 17 "$f"
Narann 6y ago
Extract audio from all my downloaded YT .webm videos to .opus: for i in *.webm ; do echo "$i";ffmpeg -i "$i" -acodec copy -vn "${i%.*}.opus" ; done Nothing fancy.
pkulak 6y ago
# Encode for Apple, 720p ffmpeg -i snow.mp4 -c:v libx265 -preset slow -crf 28 -tag:v hvc1 -c:a aac -ac 2 -b:a 128k -vf scale=1280:-1 snow.mov # Merge video from one file, audio from another, trimmed ffmpeg -i video.mp4 -i audio.mp4 -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 -to 00:00:41 merged.mp4 # Trim a video ffmpeg -ss 00:06:58 -to 00:08:26 -i TeSiJmLoJd0.webm bbf.mp4
deleted 6y ago
[deleted]
quijoteuniv 6y ago
This one just add a 5 second title to the video taking the name from the file name #!/bin/bash #Creates a Directory mkdir -p titles #loop for files in folder for f in .MOV; do text="${f%.MOV}" #Uses drawtext ffmpeg -i "$f" -vf drawtext="fontfile=/usr/share/fonts/opentype/NotoSansCJK-Regular.ttc : \ text=$text : fontcolor=white: fontsize=82: box=1: boxcolor=black@0.5: \ boxborderw=20: x=(w-text_w)/2:y=h-th-40 :enable='between(t,0,5)'" -codec:a copy "./titles/$f" done # Other options: # Bottom center: x=(w-text_w)/2:y=h-th (with 10 px padding: x=(w-text_w)/2:y=h-th-20) # centered: x=(w-text_w)/2: y=(h-text_h)/2 This is my trim tool to cut beginnings and/or endings of files #!/bin/bash mkdir -p trimmed duration=$(ffmpeg -i "$1" 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//) length=$(echo "$duration" | awk '{ split($1, A, ":"); print 3600A[1] + 60*A[2] + A[3] }' ) trim_start="$2" trim_end=$(echo "$length" - "$3" - "$trim_start" | bc) ffmpeg -ss "$trim_start" -i "$1" -c copy -map 0 -t "$trim_end" "./trimmed/$1" # Example # >trim example.MOV 0.2 10
wwalexander 6y ago
Back in 2004, someone released an unauthorized fan dub/narration of the the first Harry Potter movie called Wizard People, Dear Reader that hilariously butchers the entire plot, character names, and motivations. This narration is (loosely) synced to the movie and its scenes, and for a long time I watched it via clips uploaded to YouTube. But when Sorcerer’s Stone got a 4K release, I decided it was time to rip it and create my own canonical copy. The original audio files of the dub were at this point still available on archive.org. The problem is that the second audio file is not meant to play directly after the first - this was back in the days of CD players, so halfway through the movie the dub instructs you to begin playing the second CD once the next scene starts. The other problem is that the second file is louder than the first. Most sources I saw online said to insert a gap of three seconds to account for the delay, and didn’t have a solution for the difference in volume. I wanted to be more precise. First, I found the exact start time of the scene where the second audio track begins: ffprobe hp.mkv ... Chapter #0:18: start 4428.882000, end 4817.521000 Metadata: title : Chapter 19 ... Then I compared this with the duration of the first audio track: ffprobe wiz1.mp3 ... Duration: 01:13:45.33, start: 0.000000, bitrate: 66 kb/s ... The difference between these time stamps gave the actual delay of 3.582 seconds. I then compared the maximum audio levels of the two audio tracks to determine the level to increase the first track’s volume by (there are more advanced features in FFmpeg for volume normalization, but I just wanted to remove the potential for eardrum damage when beginning Chapter 19 and keep things as similar as possible otherwise): ffmpeg -i wiz1.mp3 -af volumedetect -f null - [Parsed_volumedetect_0 @ 000001ecf871c1c0] max_volume: -11.1 dB ffmpeg -i wiz2.mp3 -af volumedetect -f null - [Parsed_volumedetect_0 @ 000001858b881880] max_volume: -3.6 dB This gave me the volume increase for the first track of 7.5 dB. Once I had these numbers, it was time for the one-liner to adjust the first track’s volume, concatenate the two tracks with the gap of silence, and mux them with the video from the movie: ffmpeg -i hp.mkv -i wiz1.mp3 -i wiz2.mp3 -filter_complex "[1]volume=7.5dB[wiz1];aevalsrc=0:duration=3.582:sample_rate=22050[gap];[wiz1][gap][2]concat=n=3:v=0:a=1,apad[wiz]" -map 0 -map "[wiz]" -shortest -c:v copy -c:a flac -sample_fmt s16 -f matroska wiz.mkv
kdeldycke 6y ago
Indeed! Here is my collection of FFmpeg CLIs: https://github.com/kdeldycke/kevin-deldycke-blog/blob/main/content/posts/video-commands.md#ffmpeg https://github.com/kdeldycke/kevin-deldycke-blog/blob/main/c...

I think everyone was a txt file on their computer filled with FFmpeg commands. Care to share yours?

rimliu 6y ago

I have none. But I do gave HandBrake installed.

edflsafoiewq 6y ago
I always grep for ffmpeg in .bash_history.
- m463 6y ago
  I use control-r very often.

bejelentkezni 6y ago

All I have that I'm not seeing elsewhere in the replies is: ffmpeg -r 1 -loop 1 -i 1.png -i 1.wav -c:v libvpx -c:a libvorbis -b:a 64k -shortest out.webm (clearly this is old) -max_muxing_queue_size 2048 (magically fixes some errors and microscopically increases quality, a no-brainer on machines with more than token amounts of RAM)

ducktective 6y ago

There is tldr: https://github.com/tldr-pages/tldr/blob/master/pages/common/ffmpeg.md https://github.com/tldr-pages/tldr/blob/master/pages/common/...

Ndymium 6y ago

Here's one I wrote a blog post[0] about on how to merge two audio tracks of a video into one track without re-encoding the video: ffmpeg -i 'input.mkv' -filter_complex '[0:a:1]volume=0.1[l];[0:a:0][l]amerge=inputs=2[a]' -map '0:v:0' -map '[a]' -c:v copy -c:a libmp3lame -q:a 3 -ac 2 'output.mp4' [0] https://blog.nytsoi.net/2017/12/31/ffmpeg-combining-audio-tracks https://blog.nytsoi.net/2017/12/31/ffmpeg-combining-audio-tr...

cm2187 6y ago

mine: h264: -c:v libx264 -preset medium -crf 22 h265: -c:v libx265 -preset medium -crf 26 no recompress: -c copy presets: ultrafast,superfast, faster, fast, medium, slow, slower, veryslow desinterlace: -vf yadif target size: -s 1920x1080 aspect ratio without recompressing: -aspect 16:9 rotate video: -vf "transpose=1" 0 = 90CounterCLockwise and Vertical Flip (default) 1 = 90Clockwise 2 = 90CounterClockwise 3 = 90Clockwise and Vertical Flip rotate without recompressing: -metadata:s:v rotate="90" audio aac two channels: -c:a aac -b:a 160k -ac 2 web fast start: -movflags +faststart autoscale to WxH with black bands: -vf "scale=W:H:force_original_aspect_ratio=decrease,pad=W:H:(ow-iw)/2:(oh-ih)/2" get jpeg snapshot: -vframes 1 -q:v 2 dest.jpg concatenate mp4 without recompressing: -f concat -safe 0 -i "files.txt" -c copy -movflags +faststart files.txt format: file 'filepath' ffprobe get videoinfo: ffprobe -v quiet -print_format xml -show_format -show_streams "filepath" > file.xml if override which sub track is default, use "-default_mode infer_no_subs" clear disposition (default sub): -disposition:s 0 default or forced disposition: -disposition:s forced track metadata (audio): -metadata:s:a title="xx" track metadata (video): -metadata:s:v title="xx" global metadata: -metadata title="xx" -metadata description="xx" -metadata comment="xx" extract sound from video to mp4 ffmpeg -i source_video.avi -vn -ar 44100 -ac 2 -ab 192k -f mp3 sound.mp3 skip time (place after input file): -ss 00:05:00 stop after: -t 00:05:00 Approx fast seek (place before input file): -ss 00:05:00 -noaccurate_seek -i ....

BigBalli 6y ago
If you place -ss after the input file it will take longer. For true seek place -ss before -i.
- rainbowzootsuit 6y ago
  It will only approximately seek to a te using GOP i-frames if you do -ss before -i which in MPEG2 is generally ~15frames=0.5s. But a GOP can be pretty long, like 30s, in MPEG4. https://ottverse.com/trim-cut-video-using-start-endtime-reencoding-ffmpeg/ https://ottverse.com/trim-cut-video-using-start-endtime-reen...

puzzlingcaptcha 6y ago

I only have one, and it's for a rather niche use: fixing incorrect or missing h264/h265 bitstream metadata without re-encoding, for example: ffmpeg -i source.avc -c copy -bsf:v h264_metadata=colour_primaries=1:matrix_coefficients=1 output.h264 https://ffmpeg.org/ffmpeg-bitstream-filters.html#h264_005fmetadata https://ffmpeg.org/ffmpeg-bitstream-filters.html#h264_005fme... https://www.itu.int/rec/T-REC-H.264-201906-I/en https://www.itu.int/rec/T-REC-H.264-201906-I/en

cooper12 6y ago

ffmpeg -i foo.mp4 -c:v h264_videotoolbox -b:v 1600k foo_out.mp4 On macOS, this uses hardware acceleration to reencode a video at a lower bitrate. My macbook is from 2012, so this does make a notable difference. There's also "hevc_videotoolbox" for H.265 if your machine supports it.

izacus 6y ago
It will also significantly tank the quality (HW encoders are horrible at quality-per-bit ratio) - libx264 at this bitrate will make a huge difference in how good the video will look.

eXpl0it3r 6y ago

Video to GIF SET filters="fps=%4,scale=%3:-1:flags=lanczos" ffmpeg -v warning -i %1 -vf "%filters%,palettegen" -y palette.png ffmpeg -v warning -i %1 -i palette.png -lavfi "%filters% \[x\]; \[x\]\[1:v\] paletteuse" -y %2 DEL palette.png togif.bat <input.mp4> <output.gif> <width> <fps> Extract audio from a video ffmpeg -i "path\to\my_input_video_file.mp4" "path\to\my_output_audio_only.wav" Extract specific video and audio stream ffmpeg -i "path\to\my_input_video_file.mp4" -map 0:0 -c copy video.mp4 -map 0:1 -c copy audio0.m4a -map 0:2 -c copy audio1.m4a Concatenate two or more video clips (echo file 'first file.mp4' & echo file 'second file.mp4' )>list.txt ffmpeg -safe 0 -f concat -i list.txt -c copy output.mp4 Convert 10-bit H.265 to 10-bit H.264 ffmpeg -i input -c:v libx264 -crf 18 -c:a copy output.mkv Convert 10-bit H.265 to 8-bit H.265 ffmpeg -i input -c:v libx265 -vf format=yuv420p -c:a copy output.mkv Convert 10-bit H.265 to 8-bit H.264 ffmpeg -i input -c:v libx264 -crf 18 -vf format=yuv420p -c:a copy output.mkv

jscholes 6y ago
> Extract audio from a video If you use `-vn` and `-acodec copy` (I use both although not sure `-vn` is strictly necessary), you can demux the audio from the video in the same format it is already in. Of course, you're extracting to wav so not transcoding, but copying may be faster/use less space.
joshspankit 6y ago
> Extract audio from a video In my opinion, `ffmpeg -i filename.mp4 filename.wav` is one of the greatest known examples of powerful functionality with a simple interface.

paol 6y ago

Gladly. There's even some relatively advanced stuff in there: # Save a RTSP stream to file ffmpeg -i rtps://someserver/somevideo -c copy out.mp4 # encoding quality settings examples # H264 ffmpeg -i input.mp4 -a:c copy -c:v libx264 -crf 22 -preset slower -tune film -profile:v high -level 4.1 output.mp4 # H264 10bit (must switch to a different libx264 version) LD_LIBRARY_PATH=/usr/lib/x86_64-linux-gnu/x264-10bit ffmpeg -i input.mp4 -a:c copy -c:v libx264 -crf 22 -preset slower -tune film -pix_fmt yuv420p10le -profile:v high10 -level 5.0 output.mp4 # resize ffmpeg -i in.mp4 -s 480x270 -c:v libx264 out.mp4 # change source fps ffmpeg -r 10 -i in.mp4 out.mp4 # resample fps ffmpeg -i in.mp4 -r 10 out.mp4 # extract the audio from a video ffmpeg -i inputfile.mp4 -vn -codec:a copy outputfile.m4a # merge audio and video files ffmpeg -i inputfile.mp4 -i inputfile.m4a -codec copy outputfile.mp4 # cut (reencoding) # set the start time and duration as HH:MM:SS ffmpeg -ss 00:00:40.000 -i input.mp4 -t 00:00:10 -c:v libx264 output.mp4 # set the start time and duration as seconds ffmpeg -ss 40.0 -i input.mp4 -t 10.0 -c:v libx264 output.mp4 # skip an exact number of frames at the start (100) ffmpeg -i input.mp4 -vf 'select=gte(n\,100)' -c:v libx264 output.mp4 # cut (w/o reencoding - cut times will be approximate) ffmpeg -ss 40.0 -i input.mp4 -t 10.0 -c copy output.mp4 # save all keyframes to images ffmpeg -i video.mp4 -vf "select=eq(pict_type\,I)" -vsync vfr video-%03d.png # encode video from images (image numbering must be sequential) ffmpeg -r 25 -i image_%04d.jpg -vcodec libx264 timelapse.mp4 # flip image horizontally ffmpeg -i input.mp4 -vf hflip -c:v libx264 output.mp4 # crop and concatenate 3 videos vertically ffmpeg -i cam_4.mp4 -i cam_5.mp4 -i cam_6.mp4 -filter_complex "[0:v]crop=1296:432:0:200[c0];[1:v]crop=1296:432:0:200[c1];[2:v]crop=1296:432:0:230[c2];[c0][c1][c2]vstack=inputs=3[out]" -map "[out]" out.mp4 # 2x2 mosaic (all inputs must be same size) ffmpeg -i video1.mp4 -i video2.mp4 -i video3.mp4 -i video4.mp4 -filter_complex "[0:v][1:v]hstack=inputs=2[row1];[2:v][3:v]hstack=inputs=2[row2];[row1][row2]vstack=inputs=2[out]" -map "[out]" out.mp4 # picture-in-picture ffmpeg -i video1.mp4 -i video2.mp4 -filter_complex "[1:v]scale=iw/3:ih/3[pip];[0:v][pip]overlay=main_w-overlay_w-20:main_h-overlay_h-20[out]" -map "[out]" out.mp4 # print framerate of every file in dir for f in *.mp4; do echo $f; mediainfo $f|grep "Frame rate"; done # print selected info of every file in dir in CSV format for f in *.mp4; do echo -n $f,; mediainfo --Inform="Video;%Duration%,%FrameCount%,%FrameRate%" $f; done

hivacruz 6y ago

jonplackett 6y ago

-pix_fmt yuv420p Every damn time I have to export from after effects and need a file I can actually open.

bambax 6y ago

Here are two not present in the comments so far. Print subtitles (useful for old TVs that can't select a subtitle from streams or files; I use this to get my kids to watch movies in English): -vf "ass=subtitle.ass" or with .srt and in a huge yellow font -vf "subtitles=subtitles.srt:force_style='Fontsize=36,PrimaryColour=&H0000FFFF'" Extract 1 second of video every 90 seconds (if you have very long footage of a trip from a dashcam and you don't know what to do with it, that makes for a much shorter "souvenir"): -vf "select='lt(mod(t,90),1)',setpts=N/FRAME_RATE/TB" -af "aselect='lt(mod(t,90),1)',asetpts=N/SR/TB"

pchm 6y ago

mov2gif: ffmpeg -i input.mov -vf "fps=10,scale=600:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif

mjaniczek 6y ago

function grab-screen-lossless { ffmpeg -an -f x11grab -video_size 1920x1080 -framerate 60 -i :0.0 -c:v h264_nvenc -preset llhq -tune zerolatency -crf 0 -qp 0 "${1}" } function grab-screen { ffmpeg -an -f x11grab -video_size 1920x1080 -framerate 60 -i :0.0 -c:v h264_nvenc -preset llhq -tune zerolatency -qp 10 "${1}" } function vid_compress { ffmpeg -i "${1}" -codec:v libx264 -preset:v fast -pix_fmt yuv420p "${2}" }

superasn 6y ago
Wow never realized ffmpeg could be used like this! Unfortunately both these commands create a somewhat jerky video on my rx 550 on linux mint and drives CPU crazy (ryzen 3500). I guess it's my underpowered graphics card, but any way to tweak your grab-screen-lossless for a smoother capture?
- zerocrates 6y ago
  I'm surprised those specific commands work at all on your machine, since they use the Nvidia-specific nvenc.
  - superasn 6y ago
    probably because i habe a gt 710 in the second slot for driving my 4 monitor setup. also it could be the reason why the capture is so choppy.
  - superasn 6y ago
    Also I tried with -vcodec huffyuv after searching the internet, but no change in performace :/

stevens37 6y ago

slow down by 10x (gopro 240fps to 24fps) ffmpeg -i ${1} -sn -an -c:v libx264 -r 24 -filter:v "setpts=10PTS" -crf 19 ${1}-10x.mkv reverse video ffmpeg -i $IFILE -s 3840x2160 -f image2 -q:v 1 -vf format=yuvj420p $tmpdir/p%8d.jpg cat $(ls -t $tmpdir/p.jpg) | ffmpeg -f image2pipe -c:v mjpeg -r 30 -i - -c:v libx264 -crf 18 -vf format=yuv420p -preset slow -f mp4 $OFILE loop a video: loopcount=$1 ffmpeg -stream_loop $1 -i $2 -c copy $3.mkv

hanselot 6y ago

I use various scripts, not a single file. This one I call recorder which I use to record meetings. ffmpeg -video_size 3840x1080 -framerate 25 -f x11grab -i :0.0+0,0 -f pulse -ac 2 -i default $1.mkv resolution needs to be adjusted for your setup

captn3m0 6y ago

avi2gif: ffmpeg -i $1 -vf scale=320:-1:flags=lanczos,fps=10 /tmp/frames/ffout%03d.png convert -loop 0 /tmp/frames/ffout*.png $1.gif flac2mp3 parallel-moreutils -i -j$(nproc) ffmpeg -i {} -qscale:a 0 {}.mp3 -- ./*.flac rename .flac.mp3 .mp3 ./*.mp3 screencast TIMESTAMP=`date +"%Y-%m-%d_%H"` TMP_AVI=$(mktemp /tmp/outXXXXXXXXXX.avi) ffcast -s % ffmpeg -y -f x11grab -show_region 1 -framerate 15 \ -video_size %s -i %D+%c -codec:v huffyuv \ -vf crop="iw-mod(iw\\,2):ih-mod(ih\\,2)" $TMP_AVI \ && convert -set delay 10 -layers Optimize $TMP_AVI /home/nemo/Desktop/GIFs/$TIMESTAMP.gif split-audio-by-chapters[0] to split a audiobook from Audible to multiple files by chapters. split-by-audible[1] to split a audiobook from Audible to multiple files by chapters using the copied timestamps from the Audible Web Player. split-by-silence[2] to split audiobooks by Silence instead audiobook2video[3] to generate a video file from audiobooks. Puts up a nice cover. [0]:https://github.com/captn3m0/Scripts/blob/master/split-audio-by-chapters https://github.com/captn3m0/Scripts/blob/master/split-audio-... [1]: https://github.com/captn3m0/Scripts/blob/master/split-by-audible https://github.com/captn3m0/Scripts/blob/master/split-by-aud... [2]: https://github.com/captn3m0/Scripts/blob/master/split-by-silence https://github.com/captn3m0/Scripts/blob/master/split-by-sil... [3]: https://github.com/captn3m0/Scripts/blob/master/audiobook2video https://github.com/captn3m0/Scripts/blob/master/audiobook2vi...

slazaro 6y ago

Cut ffmpeg video without losing quality by keeping the same codecs, very fast: Example: Start at 52 seconds, take 10 minutes after that: ffmpeg -ss 52 -i input.mp4 -c copy -t 00:10:00.0 output.mp4

krisgenre 6y ago

Convert AVI to MP4 ---------------------------- ffmpeg -i input.avi -c:v libx264 -crf 19 -preset slow -c:a libvo_aacenc -b:a 192k -ac 2 out.mp4 Convert MP4 to GIF --------------------------- mkdir frames ffmpeg -i video.mp4 -r 5 'frames/frame-%03d.jpg' cd frames convert -delay 20 -loop 0 -layers Optimize *.jpg myimage.gif

rpastuszak 6y ago

Here's one that generates AppStore previews with correct sizes and metadata. (iTunes Connect can be really picky about this sometimes.) # 1. Record your device using QuickTime # (File->New Movie Recording->Select your phone) # 2. Run `$ app-preview your-recording.mov` function app-preview() { echo "name $1" ffmpeg -i $1 -vf scale=1080:1920,setsar=1 -c:a copy "out_$1" }

Ciantic 6y ago

I have one glorious: ffmpeg -hwaccel cuvid -c:v h264_cuvid -i input.mp4 -vf "hwdownload,format=nv12,scale=(iw*sar)*max(1280/(iw*sar)\,720/ih):ih*max(1280/(iw*sar)\,720/ih), crop=1280:720, subtitles=input.srt:force_style='FontName='TiresiasScreenfont',Fontsize=32,Outline=2,MarginL=50,MarginV=30,Alignment=1',minterpolate=fps=60:mi_mode=blend" -c:v h264_nvenc -preset slow -b:v 8M -f matroska - | vlc - What it does: Allows streaming content to Chrome Cast with my idea of subtitles through VLC. For me I want subtitles with Tiresias screen font used in Finnish YLE 90s. (Aligned always to left second row, so that starting point is always the same. Center alignment is bad because you need to always re-adjust eyes to the position where the subtitles start, left alignment makes the first character always in same place.) * `hwaccel cuvid -c:v h264_cuvid` * makes the hardware accelerated decoding (h264 only) * `-vf` * video filter * `hwdownload,format=nv12` * downloads the hardware accelerated frame to memory for the video filter (required by cuvid) * `scale=(iwsar)max(1280/(iwsar)\,720/ih):ihmax(1280/(iw*sar)\,720/ih), crop=1280:720` * crops the video to 1280x720, (exteremely high impact on performance!) Use crop and resize cuvid below for better performance. * `subtitles=input.srt:force_style='FontName='TiresiasScreenfont',Fontsize=32,Outline=2,MarginL=50,MarginV=30,Alignment=1'` * subtitles * `-c:v h264_nvenc -preset slow -b:v 8M` * hardware accelerated encoding 8000 kb/s for 720p/60 (for 1080p use `16M`) * `-f matroska * | vlc -` * output as matroska, pipe to VLC * `minterpolate=fps=60:mi_mode=blend` * output 60 fps interpolate blending (this can cause problems, avoid sometimes) Crop and resize with cuvid example: * `-hwaccel cuvid -crop 0x0x200x200` - faster way to crop top x bottom x left x right * `-hwaccel cuvid -resize 1200x300` - resize (forces the size) Seek example: Seek to 30 minutes (60*30 = 1800) ffmpeg -ss 1800 ... vf "hwdownload,format=nv12,setpts=PTS+1800/TB,subtitles='...',setpts=PTS-STARTPTS"`

nathancahill 6y ago
Been following the VLC subtitles/Chromecast issue for several years now. Thank you so much for this!
VilleSalonen 6y ago
According to Yle they only started using Tiresias in 2012. The article doesn't mention which font they were using before. I would be interested in their 90s font as well. Source: https://yle.fi/aihe/artikkeli/2012/01/27/televisiokanavien-tekstitysfontti-vaihtuu-eika-se-ole-comic-sans https://yle.fi/aihe/artikkeli/2012/01/27/televisiokanavien-t...

m463 6y ago

I wonder if ffmpeg should have a scripting language and/or repl

abrowne 6y ago

Convert all FLAC files in the directory to MP3s, in parallel using fd: fd -t f -e flac . "$@" -x ffmpeg -loglevel 16 -i "{}" -qscale:a 0 "{.}.mp3"

mnw21cam 6y ago

I wrote a command-line based video editing tool as a 300-line bash script. It reads a list of segments of video (source file, start position, length) to string together (including options such as image overlay, fade, fast forward, slow motion, static image) from a text file, and converts it into a Makefile with ffmpeg commands in it, which you can then run with whatever level of parallelism you wish. It treats the video and sound separately, and creates a video and sound file for each segment, using concatenatable formats for both. Then the final few make targets are to concatenate the video into one file, the sound into another file, and then multiplex them into a single file. Used it a few times for editing my own videos. It's a bit big to share here though.

lgeorget 6y ago

$cat ~/bin/ffmpeg_grab_desktop.sh #!/bin/bash size=${1:-"1920x1080"} offset=${2:-"0,0"} name=${3:-"video"} ffmpeg -video_size $size -framerate 25 -f x11grab -i :0.0+$offset -c:v libx264 -crf 0 -preset ultrafast "$name.mkv" ffmpeg -i "$name.mkv" -movflags faststart -pix_fmt yuv420p "$name.mp4"

snowbrook 6y ago

Test patterns: ffmpeg -f lavfi -i testsrc=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-testsrc.mp4 ffmpeg -f lavfi -i testsrc2=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-testsrc.mp4 ffmpeg -f lavfi -i smptebars=d=60:s=1920x1080:r=24,format=yuv420p -f lavfi -i sine=f=440:b=4 -b:v 1M -b:a 192k -shortest output-smptebars.mp4

tootie 6y ago

I store my list of ffmpeg shortcuts on a website called StackOverflow

dkarp 6y ago

Downmixes audio on movies from surround sound to stereo balanced for night watching (prevents audio being too quiet) so that they can direct stream on my devices ffmpeg -hide_banner -loglevel error -nostdin -y -i "$f" -map 0:0 -c:v copy -map 0:a:0? -c:a:0 aac -b:a:0 160k -filter:a:0 "pan=stereo|FL=1.414*FC+0.707*FL+0.5*FLC+0.5*BL+0.5*SL+0.5*LFE|FR=1.414*FC+0.707*FR+0.5*FRC+0.5*BR+0.5*SR+0.5*LFE,acompressor=ratio=4" -metadata:s:a:0 title="NightMixed" -metadata:s:a:0 language=eng -disposition:a:0 default -map 0:a:0? -c:a:1 copy -disposition:a:1 none -map 0:a:1? -c:a:2 copy -disposition:a:2 none -map 0:a:2? -c:a:3 copy -disposition:a:3 none -map 0:a:3? -c:a:4 copy -disposition:a:4 none -map 0:a:4? -c:a:5 copy -disposition:a:5 none -map 0:a:5? -c:a:6 copy -disposition:a:6 none -map 0:a:6? -c:a:7 copy -disposition:a:7 none -map 0:a:7? -c:a:8 copy -disposition:a:8 none -map 0:a:8? -c:a:9 copy -disposition:a:9 none -map 0:s:0? -c:s:0 copy -map 0:s:1? -c:s:1 copy -map 0:s:2? -c:s:2 copy -map 0:s:3? -c:s:3 copy -map 0:s:4? -c:s:4 copy -map 0:s:5? -c:s:5 copy -map 0:s:6? -c:s:6 copy -map 0:s:7? -c:s:7 copy -map 0:s:8? -c:s:8 copy -map 0:s:9? -c:s:9 copy "/home/pi/media/remixed_in_progress/$f"

lloeki 6y ago
Goddammit I can't believe how downmixing x.y to 2.0 isn't a solved problem by now and is so broken through and through. I mean, it's never ever done in a way that doesn't produce quiet dialog that makes you raise volume and loud sounds that makes your eardrums bleed. Like, even basic audio normalisation would produce half-decent results, but no we get crazy contrast by default and constant volume switching.
- dkarp 6y ago
  The interesting part is that most media is being consumed with stereo audio down-mixing. Everyone streaming content on their laptops, with their television's speakers or with a sound bar. Yet all the audio is recorded and mastered for surround sound systems, even though they could include mastered stereo audio without the down-mixing issues like quiet audio.

b1gtuna 6y ago

Here is mine. To screen capture every 600 frames: ffmpeg -i my_vid.mp4 -vf "select=not(mod(n\,600))" -vsync vfr -q:v 15 img_%03d.jpg To make a montage that's 1024 px wide: for d in \* do (montage -mode concatenate -tile 4x -resize 1024x $d"/\* "$d".jpg) done

donatj 6y ago

Very Carefully Rebuild a Video # H264 $ ffmpeg -i input.avi -c copy -c:v libx264 -crf 18 -preset slow output.mkv # H265 -c:v libx265 -crf 22 Append Subtitles $ ffmpeg -i input.mkv -i input.srt -map 0 -map 1 -c copy output.mkv Concat Videos $ ls *.mkv > mylist.txt $ vim mylist.txt # append each line with "file " $ ffmpeg -f concat -i mylist.txt -c copy merged-pre-subbed.mkv Probe size issues? $ ffmpeg -analyzeduration 2147483647 -probesize 2147483647 ... Deinterlace -vf yadif Metadata Examples ffmpeg -i foo.avi -i commentary.mp3 -map 0 -map 1 -c:a copy -c:v libx264 -crf 18 -preset fast -metadata:s:a:1 title="Commentary" -metadata:s:a:0 language=eng funk.mkv Autocrop $ ffplay -i foo.mkv -vf "cropdetect=24:16:0" <let it run for a minute> [Parsed_cropdetect_0 @ 0x7ff093c65c00] x1:0 x2:1919 y1:132 y2:947 w:1920 h:816 x:0 y:132 pts:30155 t:30.155000 crop=1920:816:0:132 -filter:v:0 "crop=1920:816:0:132"

yakubin 6y ago

Annotate video with frame numbers: ffmpeg -i input.mp4 -vf "drawtext=fontfile=font.ttf: text=%{n}: x=48: y=48: fontcolor=white: box=1: boxcolor=0x00000099: fontsize=72" -y output.mp4 Remove audio track from video: ffmpeg -i input.mp4 -c copy -an output.mp4

nsajko 6y ago

Not an ffmpeg wizard here, but here are my screencasting commands. Probably the most useful knowledge in this snippet is how to use Alsa from ffmpeg; i.e., Alsa devices can be referred to as hw:0, hw:1, etc; and one finds out which device to use from arecord. # Example output file. f=/tmp/output.mp4 # Example video resolution. g=1920x1080 # Example capture framerate fr=4 # Example X11 display d=$DISPLAY # Simple screencast. # # Try adjusting the libx264 CRF from 15 to some greater number, as long # as there is no visible effect on video quality. # # If increasing the capture framerate, you may also wish to use a # faster preset. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -i "$d" \ -c:v libx264 -crf 15 -preset veryslow "$f" # Simple screencast without drawing the pointer/cursor. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -draw_mouse 0 -i "$d" \ -c:v libx264 -crf 15 -preset veryslow "$f" # See what devices are available for capturing sound. arecord -l # Select a device. audioCaptureDevice=hw:0 # List some permitted parameters associated with device 0. # # We are interested in the "FORMAT", "CHANNELS", and "RATE" parameters # for use in the ffmpeg command. arecord --dump-hw-params -D "$audioCaptureDevice" audioSampleFormat=pcm_s32le audioNumChannels=2 audioRate=44100 f=/tmp/output.mp3 # Record sound. ffmpeg -thread_queue_size 8192 -f alsa -channels "$audioNumChannels" -sample_rate "$audioRate" \ -c:a "$audioSampleFormat" -ar "$audioRate" -i "$audioCaptureDevice" "$f" f=/tmp/output.mkv # Screencast with sound. # # Note that there seems to be an FFMPEG bug where the audio in the last # 15 seconds of the video is cut off. The workaround is to record for # 15 exrtra seconds, and then cut the extra video. ffmpeg -probesize 50M -f x11grab -video_size "$g" -framerate "$fr" -i "$d" \ -thread_queue_size 8192 -f alsa -channels "$audioNumChannels" -sample_rate "$audioRate" \ -c:a "$audioSampleFormat" -ar "$audioRate" -i "$audioCaptureDevice" \ -c:a flac -c:v libx264 -crf 17 "$f"

Narann 6y ago

Extract audio from all my downloaded YT .webm videos to .opus: for i in *.webm ; do echo "$i";ffmpeg -i "$i" -acodec copy -vn "${i%.*}.opus" ; done Nothing fancy.

pkulak 6y ago

# Encode for Apple, 720p ffmpeg -i snow.mp4 -c:v libx265 -preset slow -crf 28 -tag:v hvc1 -c:a aac -ac 2 -b:a 128k -vf scale=1280:-1 snow.mov # Merge video from one file, audio from another, trimmed ffmpeg -i video.mp4 -i audio.mp4 -c:v copy -c:a aac -map 0:v:0 -map 1:a:0 -to 00:00:41 merged.mp4 # Trim a video ffmpeg -ss 00:06:58 -to 00:08:26 -i TeSiJmLoJd0.webm bbf.mp4

deleted 6y ago

[deleted]

quijoteuniv 6y ago

This one just add a 5 second title to the video taking the name from the file name #!/bin/bash #Creates a Directory mkdir -p titles #loop for files in folder for f in .MOV; do text="${f%.MOV}" #Uses drawtext ffmpeg -i "$f" -vf drawtext="fontfile=/usr/share/fonts/opentype/NotoSansCJK-Regular.ttc : \ text=$text : fontcolor=white: fontsize=82: box=1: boxcolor=black@0.5: \ boxborderw=20: x=(w-text_w)/2:y=h-th-40 :enable='between(t,0,5)'" -codec:a copy "./titles/$f" done # Other options: # Bottom center: x=(w-text_w)/2:y=h-th (with 10 px padding: x=(w-text_w)/2:y=h-th-20) # centered: x=(w-text_w)/2: y=(h-text_h)/2 This is my trim tool to cut beginnings and/or endings of files #!/bin/bash mkdir -p trimmed duration=$(ffmpeg -i "$1" 2>&1 | grep "Duration"| cut -d ' ' -f 4 | sed s/,//) length=$(echo "$duration" | awk '{ split($1, A, ":"); print 3600A[1] + 60*A[2] + A[3] }' ) trim_start="$2" trim_end=$(echo "$length" - "$3" - "$trim_start" | bc) ffmpeg -ss "$trim_start" -i "$1" -c copy -map 0 -t "$trim_end" "./trimmed/$1" # Example # >trim example.MOV 0.2 10

wwalexander 6y ago

Back in 2004, someone released an unauthorized fan dub/narration of the the first Harry Potter movie called Wizard People, Dear Reader that hilariously butchers the entire plot, character names, and motivations. This narration is (loosely) synced to the movie and its scenes, and for a long time I watched it via clips uploaded to YouTube. But when Sorcerer’s Stone got a 4K release, I decided it was time to rip it and create my own canonical copy. The original audio files of the dub were at this point still available on archive.org. The problem is that the second audio file is not meant to play directly after the first - this was back in the days of CD players, so halfway through the movie the dub instructs you to begin playing the second CD once the next scene starts. The other problem is that the second file is louder than the first. Most sources I saw online said to insert a gap of three seconds to account for the delay, and didn’t have a solution for the difference in volume. I wanted to be more precise. First, I found the exact start time of the scene where the second audio track begins: ffprobe hp.mkv ... Chapter #0:18: start 4428.882000, end 4817.521000 Metadata: title : Chapter 19 ... Then I compared this with the duration of the first audio track: ffprobe wiz1.mp3 ... Duration: 01:13:45.33, start: 0.000000, bitrate: 66 kb/s ... The difference between these time stamps gave the actual delay of 3.582 seconds. I then compared the maximum audio levels of the two audio tracks to determine the level to increase the first track’s volume by (there are more advanced features in FFmpeg for volume normalization, but I just wanted to remove the potential for eardrum damage when beginning Chapter 19 and keep things as similar as possible otherwise): ffmpeg -i wiz1.mp3 -af volumedetect -f null - [Parsed_volumedetect_0 @ 000001ecf871c1c0] max_volume: -11.1 dB ffmpeg -i wiz2.mp3 -af volumedetect -f null - [Parsed_volumedetect_0 @ 000001858b881880] max_volume: -3.6 dB This gave me the volume increase for the first track of 7.5 dB. Once I had these numbers, it was time for the one-liner to adjust the first track’s volume, concatenate the two tracks with the gap of silence, and mux them with the video from the movie: ffmpeg -i hp.mkv -i wiz1.mp3 -i wiz2.mp3 -filter_complex "[1]volume=7.5dB[wiz1];aevalsrc=0:duration=3.582:sample_rate=22050[gap];[wiz1][gap][2]concat=n=3:v=0:a=1,apad[wiz]" -map 0 -map "[wiz]" -shortest -c:v copy -c:a flac -sample_fmt s16 -f matroska wiz.mkv

kdeldycke 6y ago

Indeed! Here is my collection of FFmpeg CLIs: https://github.com/kdeldycke/kevin-deldycke-blog/blob/main/content/posts/video-commands.md#ffmpeg https://github.com/kdeldycke/kevin-deldycke-blog/blob/main/c...