MPEG Codec Identifier

I use Gspot to indentify AVI codecs, but is there anything to indentify MPG’s?

the people writing gspot are working on it for version 2.5.
As described in the mini-faq, this is a lot more tricky than with avi.
http://headbands.com/gspot/minifaq.html
see question 1.

I should add... mpeg-1, mpeg-2, and mp4 are containers, and there’s not really codecs involved, since the compression method is uniform for all file of each of the three containers.
as i said gspot 2.5 and higher will be able to tell between mpeg-1 and 2 (don’t know about 4).
avicodec can already do that. avicodec can’t read mp4 files though.

videotoolbox has the same capabilities as avicodec when it comes to identifying mpeg-1, mpeg-2, and mp4