[x264-devel] Re: Scalability

[Mathieu Monnier]

>  There is
> a certain minimal offset between the rows or macroblocks the threads for
> dependent frames are working on, yes - it is set I believe by the
> mvrange-thread option

It can go under 22 pixels ( a macroblock + 3 pixels + 3 pixels for the 
interpolation, I guess ), from what i see in the source code

> Update: I ran some tests with short keyint and large numbers of threads,
> the results appear to indicate that threading independent frames across
> keyframes does not work as suggested above.  I'm not entirely sure if it
> is supposed to work in the current implementation.

Do not forget that bframes & iframes do not take the same time to encode 
as pframes.

With only intra frames, what I said was incorrect. Bframes may indeed be 
  encoded independantly, but not all ( bref ), and they don't represent 
more than half the frames anyway, so it may only double the figure I gave.

Since we still don't know what resolution he encoded, we can't conclude 
anything.

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