[FFmpeg-devel] FFv1.3: full GOP 1/300, 2-pass statistics for Derf's collection

Loren Merritt lorenm at u.washington.edu
Wed Dec 5 06:12:24 CET 2012

On Wed, 5 Dec 2012, Peter B. wrote:

> It's very interesting to see that 2-pass with GOP=1 reaches almost the
> same compression ratio as single-pass with GOP=300. In some cases, it's
> even small than GOP=300 (marked red).

Of course. Each of your test videos is a single scene. The probability
tables don't need to change much from one frame to the next, because the
content doesn't change much.

The same result *might* also hold for a whole movie, but your experiment
doesn't predict that one way or the other.

--Loren Merritt

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