[MPlayer-dev-eng] [PATCH] synch to new x264 revision

[Loren Merritt]

On Fri, 24 Sep 2004, Guillaume POIRIER wrote:
> Good to know frameref is working as expected...
> May I suggested the same test on a movie-real-world scene? How about a
> traveling with trees in the foreground that hide the background?
> ... or maybe it's already taken care of by regular MPEG-4?
> I'm not the movie expert here.
>
> I did make some "explorations" with Romain Dolbeau's mencgen
> (http://www.caps-entreprise.com/private/dolbeau/lavcGenetic/lavcGenetic.html).
> (Nice tool, you should try it ;-)
>
> The test is 3000 frames long and is taken from a clean recent cartoon.
>
> fullinter improves PSNR 40% of the time

ok. Does it produce a net improvement when you include the cases where it 
doesn't help? Also, fullinter's performance is probably correlated with 
subq. Do you have any stats on when it helps?

> deblock helps 50% of times
>
> deblockalpha doesn't help 73% of the time,
> helps when set to 1 13% of the times
>
> deblockbeta doesn't help 73% of times

deblock isn't about PSNR (though deblock=true,deblockalpha=0,deblockbeta=0 
is usually the best PSNR in my tests). It's about what you think is the 
best tradeoff between detail and blocking.

> iframe interval does need to be increased. If helps when set higher than
> 100 50% of time

And iframe>100 hurts the other 50% or the time? Or did scenechange 
detection kick in and not actually use >100 iframe interval?

> qcomp helps when set to 0.6 50% of times

qcomp=0.6 is the default. What other values is this compared to?

> subq helps when set to 5 or 3 50% of times
> and helps when set to 0 33% of times

really? subq=0 should _always_ be worse than subq=1 by a large margin,
(0 searches with only halfpel precision, but still takes the bits to 
store qpel) and subq>1 should _always_ be better, though the amount of 
difference depends on the source video.

> iframes help when set to 2 47% of times, when set to 3 33% of times

what option is "iframes"? do you mean "idrframe"?

--Loren Merritt