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shell - Using mplayer to determine length of audio/video ...
https://stackoverflow.com/questions/497681/using-mplayer-to-determine-length-of-audio-video-file
3. The following works very nicely to determine the length of various audio/video files: mplayer -identify file.ogg 2>/dev/null | grep ID_LENGTH. However, I want to kill mplayer's output so I can determine the length of many files more efficiently.
MPlayer
http://www.mplayerhq.hu/DOCS/man/en/mplayer.1.html
MPlayer prints the available audio IDs when run in verbose (-v) mode. When playing an MPEG-TS stream, MPlayer/MEncoder will use the first program (if present) with the chosen audio stream. -ausid (also see -alang)
sound - How to specify non-default audio stream to …
https://askubuntu.com/questions/63935/how-to-specify-non-default-audio-stream-to-mplayer
To find the audio track ID of the video that you want to play, use this: mplayer -vo null -ao null -frames 0 -v <filename> | grep aid. To play the file using the audio track required, use the track ID that is found with the previous command and use it in the following one: mplayer -aid <track_ID> <filename>. Source for this information - FAQ at MPlayerhq.hu.
Extract Audio from Video Files to WAV using Mplayer ...
https://savvyadmin.com/extract-audio-from-video-files-to-wav-using-mplayer/
The following command instruct that the audio output (-ao) should be redirected out to a PCM WAV file as fast as possible, while suppressing all video output. mplayer -ao pcm:fast:file=audio.wav -vo null -vc null video.avi. Convert the resulting WAV to MP3.
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