A cookbook by @madskjeldgaard for audio and video processing on the command line – with examples!
Includes how to generate a spectrum video from an audio file. How to combine an audio file and an image into a video. Among other things.
And it includes full #bash scripts and examples for for-loops, so you could do this on tons of audio files, if you so fancied 
@hyalinesystems @madskjeldgaard this & the sox tutorial are both so fantastic! excellent work, thank you.
@hyalinesystems @madskjeldgaard your old SoX tutorial was a constant reference point for me, and these are even better
@yannseznec Happy to hear <3
@hyalinesystems @madskjeldgaard This is a great guide & very useful! 
Since you asked for potential contribution ideas: I wrote this little script last year and been using it a bunch to create videos of slide decks (for trailers/teasers etc.). Together with this following command to extract thumbnails from a video (as a pre-processing step), you can also use this to create short/time-compressed overview videos of the x-faded thumbs:
`ffmpeg -i input.mp4 -vf crop=480:480,scale=200:-1,fps=0.01 thumb-%04d.png`
The tool is written in TypeScript (because I didn't want to fight with Bash), but shouldn't be too hard to port (if you're interested):
@toxi @madskjeldgaard that's great !! I will try it out and add it. But looks really nice. Thanks !
@hyalinesystems @madskjeldgaard brilliant!! I saw that link ages ago and couldn't find it again!!!