[Ffmpeg-devel] libavcodec: possible QPEL decoding bug.

[Michael Niedermayer]

Hi

On Sat, Sep 10, 2005 at 12:44:17AM +0200, Marius the Mad wrote:
[...]
> The story so far:
> 
> I was playing with XviD and had severe problems with image quality.
> The picture was very noisy and muddy, similar to old MS MPEG4v2 encodes.
> One of the last things I tried was changing ffdshow's XviD decoder from
> libavcodec to XviD - and it improved things a lot.
> 
> 
> What it looks like:
> 
> frame 154 from my sample, decoded by:
> 
> XviD: http://img39.imageshack.us/img39/3341/154xvid6xt.png
> libavcodec: http://img39.imageshack.us/img39/4590/154avcodec2da.png
> 
> 
> Frame 283:
> 
> XviD: http://img39.imageshack.us/img39/6135/283xvid3tg.png
> libavcodec: http://img39.imageshack.us/img39/573/283avcodec5xl.png
> 
> 
> I didn't use any postprocessing here (apart from YV12->RGB32
> convertion during decoding).
> 
> 
> My clip triggering this behaviour is available here (below 10 MB):
> http://s1.putfile.com/videos/25007444149.avi

--02:04:24--  http://s1.putfile.com/videos/25007444149.avi
           => `25007444149.avi'
Resolving s1.putfile.com... 70.85.181.139
Connecting to s1.putfile.com|70.85.181.139|:80... connected.
HTTP request sent, awaiting response... 404 Not Found
02:04:24 ERROR 404: Not Found.

[...]
-- 
Michael