flag of parser for such codecs as intra-only parsers don't set key frame 
flag. Corrects lack of key frame marking in mjpeg, possibly others.

Original thread: Key Frame Marking, Fri, 12 Oct 2007 03:35:57



git-svn-id: file:///var/local/repositories/ffmpeg/trunk@10850 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b