[x264-devel] [PATCH] tweak frame bits allocation

[Gabriel Bouvigne]

Alex Izvorski a écrit :
> Primarily useful when running with very small vbv-bufsize.
> 
> Please report any cases when it makes quality definitely worse, and/or
> causes VBV constraints to be exceeded when they weren't before. 

I played a but with this patch (but using a not so small vbv of 1.5s).
I encountered a case were x264 was already exceeding vbv before, and is 
exceeding even more with the patch:

stock x264:
x264 [warning]: VBV underflow (-27160 bits)
x264 [warning]: VBV underflow (-21280 bits)

with patch:
x264 [warning]: VBV underflow (-119352 bits)
x264 [warning]: VBV underflow (-56400 bits)
x264 [warning]: VBV underflow (-68856 bits)

This is only on the first encoding pass. On the second pass, both stock 
and patched are playing nice with the vbv.

--
Gabriel
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