set constant QP from AVCodecContext.global_quality. set key_frame flag on coded_picture correctly.
set constant QP from AVCodecContext.global_quality.
set key_frame flag on coded_picture correctly.


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@4045 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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