FFmpeg
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FFmpeg is the assembler of audio and video.
As a result, Ciro Santilli who likes "lower level stuff", has had many many hours if image manipulation fun with this software, see e.g.:
- the "Media" section of the best articles by Ciro Santillis.
- Figure "Ciro knows how to convert videos to GIFs"
As older Ciro grows, the more he notices that FFmpeg can do basically any lower level audio video task. It is just an amazing piece of software, the immediate go-to for any low level operation.
FFmpeg was created by Fabrice Bellard, which Ciro deeply respects.
Resize a video: superuser.com/questions/624563/how-to-resize-a-video-to-make-it-smaller-with-ffmpeg:
Unlike every other convention under the sun, the height in
ffmpeg -i input.avi -filter:v scale=720:-1 -c:a copy output.mkvscale is the first number.