A couple of similar questions are on stackoverflow, but I haven\'t been able to figure this exact problem out.
I want to get a list of the fourccs for t
I don't know if it's comprehensive but the source code seems to contain a list of FourCCs.
Look at http://ffmpeg.org/doxygen/trunk/isom_8c-source.html
There are lots of lines like this
{ CODEC_ID_AAC, MKTAG('m', 'p', '4', 'a') }
You should be able to download the latest source and write a script to pick them out.