Demuxing is in fact the thing to look for. I can only guess that the OP may be using ffmpeg to reencode, not just demux (+ remux, given that raw aac isn't the most handy format either).
My little audio extraction batch file basically goes like this:
My little audio extraction batch file basically goes like this:
Code:
%path-to-ffmpeg%\ffmpeg -i %1 -acodec copy -vn %1-audio.mp4I use 4K video down loader. When you open the link on the left side there will be a products drop down list of software. This should all be free, if someone wants to charge you for this stuff, it's a fake site. 4K Video Downloader | Free Video Downloader for PС, macOS and Linux | 4K Download
Of course you can upgrade but I see no reason to do so. Works great for me.
Of course you can upgrade but I see no reason to do so. Works great for me.
yea, if you dont want to re-encode like sgrossklass says. you want demuxing. very easy for computers to do, with little cpu too. also no quality loss! 
more recent ffmpeg uses "-c" for codec chocies:
.m4a is a container for audio like acc/ac3 audio formats, thats used in mp4 video container.
more recent ffmpeg uses "-c" for codec chocies:
Code:
ffmpeg -i youvideo.mp4 -c:a copy -vn yourvideoaudio.m4a.m4a is a container for audio like acc/ac3 audio formats, thats used in mp4 video container.
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