How does x265 calculate bitrate?

Question

I'm using x265 to encode a video. A get the bitrate summary and bitrate for each group of encoding frames.

When I calculate the average bitrate of the groups it does not converge with the summary bitrate.

Any ideas about how x265 calculates summary bitrate?

score 1 · Accepted Answer · answered Nov 12 '15 at 09:29

I found the solution.

It's the division of the average of the given Bits values per GOP with (1000 (for kb) multiply by the time length for the GOP).

For example GOP = 96, FPS = 30Hz, thus time length = 96/30 = 3.2

So, summary bitrate (per GOP) = (average bits)/(1000*3.2) valued in kbps

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