# Extract a section of a video
    # Note: This only copy the 1st stream of video, audio, subtitle. If your video contains
    #       multiple audios or subtitles, the your have to use -map.
    ffmpeg -y -i INPUT.mp4 -ss 00:11:53 -to 00:23:11 -c copy OUTPUT.mp4
 
 
# Convert video from 1 format to another
    ffmpeg -i INPUT.rmvb -c:v libx264 -b:a 32k OUTPUT.mp4
 
# Preserve audio and video quality but use a different container(i.e from MOV to MKV)
    ffmpeg -i INPUT.mov -vcodec copy -acodec copy OUTPUT.mkv
 
# List supported video and audio codecs
    ffmpeg -codecs
 
# Get the info of video
    ffmpeg -i INPUT.avi
 
#Convert wav file to mp3 file.
    ffmpeg -i filename.wav filename.mp3
 
# Strange behaviour when running ffmpeg in a loop. It reads standard INPUT. To turn it off.
    ffmpeg ... < /dev/null
    ffmpeg -nostdin
 

# Probe video file.
    ffmpeg -i INPUT.mkv
        #INPUT #0, matroska,webm, from 'INPUT.mkv':
        #  Metadata:
        #  Duration: 00:00:05.00, start: 0.000000, bitrate: 106 kb/s
        #    Stream #0:0: Video: h264 (High 4:4:4 Predictive), yuv444p,
        #    Stream #0:1: Audio: vorbis, 44100 Hz, mono, fltp (default)
        #    Stream #0:2: Audio: vorbis, 44100 Hz, mono, fltp (default)
        #    Stream #0:3: Audio: vorbis, 44100 Hz, mono, fltp (default)
        #    Stream #0:4: Subtitle: ass (default)
 
# Extract streams.            
    ffmpeg -i INPUT.mkv \
        -map 0:v -c copy video.mkv \
        -map 0:a:0 -c copy audio0.oga \
        -map 0:a:1 -c copy audio1.oga \
        -map 0:a:2 -c copy audio2.oga \
        -map 0:s -c copy subtitles.ass
 
    # In this case, the example above is the same as:
    ffmpeg -i INPUT.mkv \
        -map 0:0 -c copy video.mkv \
        -map 0:1 -c copy audio0.oga \
        -map 0:2 -c copy audio1.oga \
        -map 0:3 -c copy audio2.oga \
        -map 0:4 -c copy subtitles.ass          

 ffmpeg \
      -analyzeduration 500M -probesize 500M \
      -i INPUT.VOB \
      -map 0:1 -map 0:2 -map 0:3 -map 0:4 -map 0:5 -map 0:6 \
          -metadata:s:a:0 language=ita -metadata:s:a:0 title="Italian stereo" \
          -metadata:s:a:1 language=eng -metadata:s:a:1 title="English stereo" \
          -metadata:s:s:0 language=ita -metadata:s:s:0 title="Italian" \
          -metadata:s:s:1 language=eng -metadata:s:s:1 title="English" \   
      -codec:v libx264 -crf 21 \
      -codec:a libmp3lame -qscale:a 2 \
      -codec:s copy \
      OUTPUT.mkv < /dev/null