Half user provided time_base once during the first frame when there is no timebase stored in the h264 stream. This should fix fate. (ffmpeg.c used pict_repeat with its default 1/25 timebase) 
Half user provided time_base once during the first frame when there is no
timebase stored in the h264 stream.
This should fix fate. (ffmpeg.c used pict_repeat with its default 1/25 timebase) 


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17622 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg,prajnashi/ffmpeg