These scripts generate segments for DASH and HLS
https://blog.zazu.berlin/internet-programmierung/mpeg-dash-and-hls-adaptive-bitrate-streaming-with-ffmpeg.html
https://www.martin-riedl.de/category/ffmpeg/
https://ffmpeg.org/ffmpeg-codecs.html
https://trac.ffmpeg.org/wiki/HWAccelIntro
https://trac.ffmpeg.org/wiki/Encode/H.264
https://rybakov.com/blog/mpeg-dash/