Detect the case when the time base is exact but far finer than necessary to represent the time stamps, as e.g. for ipmovie.c and set a better r_frame_rate.
Detect the case when the time base is exact but far finer than necessary to
represent the time stamps, as e.g. for ipmovie.c and set a better r_frame_rate.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@17631 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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