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According to Wikipedia FFmpeg is a free and open-source software project consisting of a suite of libraries and programs for handling video, audio, and other multimedia files and streams.
I will put here some commands that I personaly use.
user@host:~$ ffmpeg -hwaccel auto -i INPUT.mp4 -vcodec libx264 -crf 20 OUTPUT.mp4
user@host:~$ ffmpeg -i INPUT.mp4 -vcodec libx264 -crf 20 OUTPUT.mp4
user@host:~$ ffmpeg -ss 5.00 -i INPUT.mp4 -c copy OUTPUT.mp4
user@host:~$ ffmpeg -t 120 -i INPUT.mp4 -c copy OUTPUT.mp4
user@host:~$ ffmpeg -ss 1:22:00 -t 4 -i /movies/1993.hot.shots.part.two.multi.1080p.bluray.x264.mkv -vf fps=10 $filename%05d.png
user@host:~$ ffmpeg -ss 1:22:00 -t 4 -i /movies/1993.hot.shots.part.two.multi.1080p.bluray.x264.mkv -vf fps=10,scale=320:-1 $filename%05d.jpg
user@host:~$ ffmpeg -i VIDEO.mp4 -b:a 192K -vn AUDIO.mp3
user@host:~$ ffmpeg -ss 10:00 -t 5 -i VIDEO.mkv -vn AUDIO.wav
user@host:~$ ffmpeg -i /movies/1998.The.Big.Lebowski.MULTI.1080p.Bluray.x264.mkv
Stream #0:0(eng): Video: h264 (High), yuv420p(progressive), 1920x1040 [SAR 1:1 DAR 24:13], 23.98 fps, 23.98 tbr, 1k tbn, 47.95 tbc (default)
Metadata:
LANGUAGE : eng
ENCODER : Lavc55.63.100 libx264
Stream #0:1(eng): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s (default)
Metadata:
title : VO
LANGUAGE : eng
ENCODER : Lavc55.63.100 ac3_fixed
Stream #0:2(fra): Audio: ac3, 48000 Hz, 5.1(side), fltp, 384 kb/s
Metadata:
title : VFF
LANGUAGE : fra
ENCODER : Lavc55.63.100 ac3_fixed
Stream #0:3(fre): Subtitle: subrip (default)
Metadata:
title : Français [Complets]
Stream #0:4(fre): Subtitle: subrip
Metadata:
title : Anglais [Complets]
user@host:~$ ffmpeg -ss 36:00 -t 8 -i /movies/1998.The.Big.Lebowski.MULTI.1080p.Bluray.x264.mkv -map 0:1 -vn /tmp/OUTPUT.wav
user@host:~$ ffmpeg -i INPUT.mp4 -vf "transpose=2" OUTPUT.mp4
user@host:~$ ffmpeg -y -i INPUT.wav -ar 16000 OUTPUT.wav
user@host:~$ ffmpeg -y -i INPUT.wav -ar 8000 -acodec pcm_s16le OUTPUT.wav
user@host:~$ ffmpeg -y -i INPUT.wav -ar 8000 -acodec pcm_u8 OUTPUT.wav
user@host:~$ ffmpeg -y -i INPUT.wav -ar 8000 -acodec pcm_u8 -ac 1 OUTPUT.wav
user@host:~$ ffmpeg -y -i INPUT.wav -ac 1 OUTPUT.wav
user@host:~$ ffmpeg -i INPUT.mp3 -c:a libopus -b:a 128k OUTPUT.opus
user@host:~$ ffmpeg -i INPUT.ogg -b:a 128K -vn OUTPUT.mp3
user@host:~$ ffmpeg -i INPUT.m4a -c:a libvorbis -ar 44100 -b:a 112k -vn OUTPUT.ogg
user@host:~$ ffprobe -show_format -show_streams INPUT.mp4
user@host:~$ ffmpeg -i VTS_06_5.VOB -target ntsc-dvd /tmp/OUTPUT.mp2
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