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FWIW, I've found that for screen captures, doing a completely lossless capture with FFMPEG often results in much smaller files. This is true mostly for situatio
by torgoguys 7y ago
FWIW, I've found that for screen captures, doing a completely lossless capture with FFMPEG often results in much smaller files. This is true mostly for situations where there is a lot of duplicate frames, not high action video games. And of course the quality can't be beat.
- pjc50 7y ago> doing a completely lossless capture with FFMPEG How? Are the iframes losslessly compressed? For some reason I thought they were equivalent to JPEG.
- sp332 7y agoIf you configure the encoder for lossless compression (-crf 0) then it won't quantize the image data. There might be rounding errors in the DCT, but it's pretty close to lossless. And there might still be a loss of data in other stages of processing, like converting RGB to YUV 4:2:0 or something. https://dsp.stackexchange.com/questions/27752/is-dct-discrete-cosine-transform-of-type-2-lossless-or-lossy https://dsp.stackexchange.com/questions/27752/is-dct-discret...
- Wowfunhappy 7y agoJust a quick thing worth noting, a lot of conventional players won't open lossless h264 content. QuickTime being one example.
- fireattack 7y agoSo basically JPEG with 100% quality (a JPEG with all quantization table factors being being 1). I personally won't call it lossless then, since no one will call 100% JPEG (even the 4:4:4 one) "lossless" (there is an entirely separate "true" lossless JPEG that no one uses). But I'm not trying to argue if it's the term H264/video codec community uses.
- pkroll 7y agoFFMPEG can use a variety of codecs, several of which provide actual lossless compression: https://ffmpeg.org/ffmpeg-codecs.htmlhttps://ffmpeg.org/ffmpeg-codecs.html#Video-Encoders https://ffmpeg.org/ffmpeg-codecs.htmlhttps://ffmpeg.org/ffmp...