Original commit message from CVS:
* ext/ffmpeg/gstffmpegcodecmap.c: (gst_ffmpeg_codecid_to_caps):
Added CODEC_ID_SMC <==> video/x-smc   caps
* ext/ffmpeg/gstffmpegdec.c: (gst_ffmpegdec_frame):
I hate ffmpeg... no keyframe information at all for VP3, so we have
to assume they're all keyframes :(