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CBR H264 with FCP7 / Compressor

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Jay James
CBR H264 with FCP7 / Compressor
on Feb 21, 2013 at 4:14:56 am

I need to output several files with: H264 CBR
In compressor I only see a restricting bit rate choice. When I set this to the client's requested bit rate, it's hit or miss - slightly below or above that limit; inconsistent. What gives? Is there a way to set CBR so all my files have the same bit rate?
Thanks


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Rafael Amador
Re: CBR H264 with FCP7 / Compressor
on Feb 21, 2013 at 3:48:42 pm

I'm not much sure how to make a CBR H264. I guess, beside limiting the data rate, would be necessary to set a key-frames value, so all the GOPs would have the same length and structure.
The problem is which key-frames value to set. You have no way to know which one is the optimal. The optimal GOP length depends of the picture contents (movement, detail, shots,..).

Personally I don't see a single reason to use CBR. You just get a less efficient compression and so, some times less quality.
rafael


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