frame skip fixes  fix 16pixel error in comparission  fix vbv messup  fix unlimited skip intervals, limited by GOP now
frame skip fixes
 fix 16pixel error in comparission
 fix vbv messup
 fix unlimited skip intervals, limited by GOP now


git-svn-id: a4d7c1866f8397a4106e0b57fc4fbf792bbdaaaf@4678 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

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