x264 : Visual blocks on global motion

[IgorC]

Here's a samples of Xvid,x264 and nero H.264 http://sr2.mytempdir.com/158133

Source is yuv raw ftp://ftp.ldv.e-technik.tu-muenchen.de/dist/test_sequences/1080p/blue_sky.yuv

x264 rev292 3 passes with very slow setings, deblocking filter -1:-1 . But comparing even to Xvid there are too much blocks.

[superdump]

I've done considerable testing with the bluesky clip myself and I noted the blocks in the sky a few weeks back. It's known and people are looking into trying to eradicate this artifact but it seems to be a tough one to conquer. Thanks for the results. :)

[stephanV]

yep, and uhm, blue sky is red sky with your samples :)

[IgorC]

yes, I also noticed that. I didn't changed nothing :)

AVS script

I think it's wrong to put it like that :
RawSource("C:\yuv\blue.yuv",1920,1080,"YV12")
LanczosResize(720,400)

[stephanV]

replace yv12 with i420 :)

(or use swapuv() )

[IgorC]

Thanks. :) Now it´s blue . The same result for x264.

[bob0r]

Try to test it with a new AQ patch by pengvado:
http://forum.doom9.org/showthread.php?t=89979
http://forum.doom9.org/showthread.php?p=813729#post813729

Lets hope it does some work!

[akupenguin]

My new AQ patch does not try to address blocking.
The idea is to reduce quality in high-motion regions, sorta like qcomp except per macroblock.

[IgorC]

The topic is prety old and has nothing to do with AQ.
Blue-sky type issue was resolved by no-fast-p-skip.
Maybe it's possible to confuse with another possible issue of x264 when some high freq. details are not preserved well (i.e filmgrain, very detail walls etc.). In this case yes AQ helps a lot as in Ateme Encoder.
Mostly comparing x264 and Ateme beta HP I can say that x264 is already slightly better but on some videos ( i.e. high detail film grain) can help only AQ or higher bitrate+CM.

I still didn't try new AQ of rev 502. Hope it will be good
It's last high prio (imo) feature what I'm waiting for from x264. :)