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H264 forced CBR?

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Hi,
I have an animated cartoon digitalized from PAL DIGIBETA tape onto the mov file with the ProRes 422HQ codec.
It is an old cartoon called PEPA: http://www.youtube.com/watch?v=DCWHh_mZogE

The initial video bitrate is variable bitrate @24.5 Mbps. I need to recompess the file into h264 with the bitrate of 6-8 Mbps and wrapp in a mov container. I have used iFFMpeg, with the Force Constant Bitrate option enabled and the bitrate set to 8000. The output file only reaches about 2000kbps.

I assume that the reason for such a low bitrate output is caused by the fact that the video file is not complex so the compresor is able to work very efficiently.

Would anyone here have a solution to this problem? How to create a forced CBR H264 video in mov container?

All the best!

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