[Theora-dev] Very visible artefacts on still frames

illiminable ogg at illiminable.com
Wed Jul 6 05:09:28 PDT 2005

The directshow filters aren't that hard to build from source, providing you 
have VS 2003.

I should be starting work on something else ogg related in august, so 
development will start up on them again, and that fix will be integrated 
into the next build.

----- Original Message ----- 
From: "Alen Ladavac" <alenl-ml at croteam.com>
To: "Thomas Vander Stichele" <thomas at apestaart.org>
Cc: <theora-dev at xiph.org>
Sent: Wednesday, July 06, 2005 8:51 PM
Subject: Re: [Theora-dev] Very visible artefacts on still frames

> Hi Thomas,
> Thanks a lot for this info. Do you know whether this problem is in the 
> encoder or in the decoder? We build decoder from the trunk, so that would 
> be fixable, but the encoder is illiminable's dsf filter, so we'd need to 
> rebuild that from source. Not trivial but we could probably try that. 
> Anyway, we'd need info on which are the diffs for that fix. Is that info 
> available somewhere?
> Thanks,
> Alen
> ----- Original Message ----- 
> From: "Thomas Vander Stichele" <thomas at apestaart.org>
> To: "Alen Ladavac" <alenl-ml at croteam.com>
> Cc: <theora-dev at xiph.org>
> Sent: Wednesday, July 06, 2005 09:55
> Subject: Re: [Theora-dev] Very visible artefacts on still frames
>> Hi,
>>> While quality is excellent during scenes with motion, all still frames 
>>> have
>>> some very annoying problems. A still frame usually appears for dramatic
>>> pause (a character's face usually), or when there is a black screen with
>>> text-only ("A few hours later..."). When the still frame initially 
>>> appears,
>>> it looks good, but as it stands still, its quality quickly degrades. 
>>> Along
>>> object borders in the image, dots appear in what looks like dithering
>>> patterns grouped in small square blocks.
>> I had that problem too, and Aaron Colwell fixed something in cvs that
>> caused this.  So the latest CVS version should work, give it a try.
>> Ralph was going to do a new release with this fix soon, but I guess he's
>> waiting on some comments on the granulepos thingy.  Ralph ?
>> Thomas
>> Dave/Dina : future TV today ! - http://www.davedina.org/
>> <-*- thomas (dot) apestaart (dot) org -*->
>> I'd like to tell you how I feel
>> I'll probably keep it till a Saturday
>> <-*- thomas (at) apestaart (dot) org -*->
>> URGent, best radio on the net - 24/7 ! - http://urgent.fm/
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