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This is a great use of a Makefile- notice how the audio file will only be downloaded if it does not already exist. That said, if you're just looking for a simp
by lwneal 7y ago
This is a great use of a Makefile- notice how the audio file will only be downloaded if it does not already exist.
That said, if you're just looking for a simple one-liner you can paste into the terminal, my go-to is this one:
cat *.jpg *.JPG *.jpeg | ffmpeg -r .5 -i - -vf "scale=w=1280:h=720:force_original_aspect_ratio=2,crop=1280:720" -y slideshow.mp4
There are many approaches described in [1], but none of them handle varying aspect ratios, which I find to be the most common problem when creating slideshows.
[1] https://trac.ffmpeg.org/wiki/Slideshow https://trac.ffmpeg.org/wiki/Slideshow
- lipeltgm 7y agoNice to come across an appreciation of makefiles, often intimidating and frustrating to many but I feel it's a great use wrt video processing.
- thosakwe 7y agoI've started appreciating Makefiles a lot after using them more. It's honestly the simplest way to batch together tasks that might depend on each other (you can even use them to deploy applications).
- jancsika 7y ago> This is a great use of a Makefile- notice how the audio file will only be downloaded if it does not already exist. Is there a sane way to extend this out to check if a directory exists, and if not then download and unzip a file to create that directory? The problem I always have with make and bash is that, for example, I only ever want two possible states-- the successfully unzipped directory or no state at all. And the more steps I add the more little state boogers my build system acquires (e.g., partial download, dangling zip file, etc.)
- gbuk2013 7y agoAssuming directory “dir” and that “data.zip” archive will create that directory, this target will create the directory dir: wget http://.../data.zip unzip data.zip