[x264-devel] Fwd: Megui's x264 rev785 trailing noise artifact

[Giancarlo Rivas]

Hi I wasnt subscribed to the list when I sent this so just in case I'm
sending it again:

---------- Forwarded message ----------
From: Giancarlo Rivas <giaym.mail at gmail.com>
Date: Tue, Mar 25, 2008 at 4:37 AM
Subject: Megui's x264 rev785 trailing noise artifact
To: x264-devel at videolan.org


Hello, I see the latest version is 791 but using Megu's autoupdate (which
brings v.785) I encoded a videogame raw video with the CQ-Lossless profile
(Constant Quality quantizer 1).

The result had glaringly obvious noise which trails when the screen
(videogame's) moves which the raw does not have.

I uploaded samples:
raw source (huffyuff): http://www.mediafire.com/?ahvq20190zn
encoded: http://www.mediafire.com/?pymgazelh5z


I got word huffyuv somehow is buggy so after recompressing the raw to RGB
the result had much less of the artifact but it was still present. With
2-pass vbr set to 1000 bitrate it was not present (HQ-Fast profile on
Megui).

The sample I uploaded turns a lot better by recompressing the source to rgb,
if you want a clip that doesn't turn _that_ good (still better) just ask :)

I recompressed many times changing options but my computer is a single core
800mhz so I have officially given up on this empiric approach, I'm encoding
with 791 though to check it has not been "fixed" already.


Yes, latest version also has the issue.

This is another raw clip where it's easy to notice the artifact once
encoded, it is already  onverted to rgb, but it has the same issue as
huffyuv:

http://www.mediafire.com/?wtpy2b5jzox
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