corresponding AVMEDIA_TYPE_* symbols. Originally committed as revision 25201 to svn://svn.ffmpeg.org/ffmpeg/trunk
Originally committed as revision 24596 to svn://svn.ffmpeg.org/ffmpeg/trunk
Patch by Josh Allmann, joshua dot allmann at gmail, original code by Ronald S Bultje. Originally committed as revision 24236 to svn://svn.ffmpeg.org/ffmpeg/trunk