[Theora-dev] Very visible artefacts on still frames

Alen Ladavac alenl-ml at croteam.com
Wed Jul 6 05:51:07 PDT 2005

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?


----- 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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