Convert mp4 to gif[(cite:>Convert video to gif with ffmpeg)]:
ffmpeg -i input.mkv -vf scale=1024:-1 -t 20 -r 20 output.gif
Convert mp3 to ogg[(cite:>convert mp3 to ogg vorbis)]
ffmpeg -i input.mp3 -c:a libvorbis -q:a 4 output.ogg
Clip video [(cite:>ffmpeg视频精准剪切)] [(cite:>ffmpeg wiki: Seeking)]:
ffmpeg -ss [start-time] -accurate_seek -i [input-file] -to [end-time] -c:v copy -c:a copy -avoid_negative_ts 1 [output-file]