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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Most home users want a small file. So the defaults may not suit what you need. But you may tweak the settings:
• Perhaps the Constant Quantizer wasn't set to OFF. Any setting other that OFF will disregard any bitrate settings, including CBR.
• Perhaps the Quantizer range wasn't broad enough to get to the desired high bitrate. (Tip: slide Qmin to "1" or "2".)
These sliders can be found in Advanced > S4.
I have checked the settings which you are referring to and they are set as follow:
I have also disabled b-frames.
The output file comes out at about 2Mb/sec. When I check the output file in iMEdia HUD it says:
The nominal bitrate is what I have set: 8Mb/sec but the bitrate value is only 1971 Kbps
The VOD platform that I work for requires the files with a bitrate between 6-8 Mb/sec.
HEre is the rundown of all the settings: http://imgur.com/4kB1Fno
Do you have any idea how to fix this?