Set reference flag for frames. Originally committed as revision 2460 to svn://svn.ffmpeg.org/ffmpeg/trunk
Originally committed as revision 2459 to svn://svn.ffmpeg.org/ffmpeg/trunk
Video-1, Apple RPZA, Cinepak, Westwood IMA ADPCM Originally committed as revision 2324 to svn://svn.ffmpeg.org/ffmpeg/trunk