[Ffmpeg-devel] [PATCH] Indeo 2 decoder

Diego Biurrun diego
Sat Jul 9 21:04:22 CEST 2005

On Thu, Jun 23, 2005 at 08:43:10AM +0200, Michael Niedermayer wrote:
> On Thursday 23 June 2005 04:49, Kostya wrote:
> > Here is the patch suggested by unkaggregate(@users.sf.net).
> > Main reason is: deltas in interframes need scaling by 3/4 before applying.
> > Detailed description is at:
> > http://sourceforge.net/tracker/index.php?func=detail&aid=1222099&group_id=1
> >6082&atid=116082 He also mentioned some samples at:
> > http://www.nerdgrounds.com/indeo21_test/
> i still see some ghosting artefacts in fish05.avi with this patch and frame 
> stepping with 's' in ffplay allthough i didnt try it with the dll
> could maybe the 3/4 actually be a variable and stored in the header? iam just 
> guessng though, also i dont belive that (x*3)>>2 is correct as its rounding 
> is asymmetric between the positive and negative numbers

If I compare fish05.avi with the Huffman encoded variants at


then I believe that the artifacts are already present in the original or
at least very hard to differentiate from what the original looks like.

I vote for applying Kostya's patch.  It's much better than what we have
currently and a perfect solution is unlikely to appear.


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