For anyone looking to dive deeper and actually understand how FFmpeg and libav work under the hood, I highly recommend Leandro Moreira's tutorial [0]. For me, it's hands down the best and most comprehensive explanation out there.
[0] https://github.com/leandromoreira/ffmpeg-libav-tutorial
I must say those commands in the original were not really interesting to me but the tutorial you posted seems much more useful
I must say those commands in the original were not really interesting to me but the tutorial you posted seems much more useful