How can I extract (not reconvert) an audio source from a video file?
video.mp4 [motionPicture.mp4 (H264) + audioSource.aac]
$ffmpeg -i video.mp4 audio.aac # Not good. This is recompressed and losing the quality even more!
$ffmpeg -i video.mp4 audio.flac # Ok, but resulting bigger file size. Lossy to lossless sounds stupid.
$mplayer -dumpaudio video.mp4 -dumpfile audio.aac # It doesn't work (and I don't know how it actually works.) Why??
If you have any idea, please advise. Thanks.