1

I want to demux the audio from avi files, so that the files are lossless. I tried both Yamb and Ffmpeg. Both produce files less than 1 MB (for a video of 80 MB), which are unplayable through VLC. I tried avidemux, and it says it can't export in copy mode.

3

Your audio is PCM, but you're trying to streamcopy to AAC, which won't work.

To extract the audio to WAV, use

ffmpeg -i DSCN5008.AVI -acodec copy -y a.wav

To transcode the audio to AAC, use

ffmpeg -i DSCN5008.AVI -acodec aac -y a.aac

Note that AAC isn't lossless. But FLAC is a lossless and compressed codec.

ffmpeg -i DSCN5008.AVI -acodec flac -y a.flac
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