[Ffmpeg-devel] enabling WMV3 decoder

[Aurelien Jacobs]

On Wed, 02 Aug 2006 13:41:33 -0700
Corey Hickey <bugfood-ml at fatooh.org> wrote:

> Aurelien Jacobs wrote:
> > On Wed, 2 Aug 2006 18:23:20 +0200
> > Diego Biurrun <diego at biurrun.de> wrote:
> > 
> >> Mike is enabling the WMV3 decoder for xine and reports that it is
> >> working great for his private samples collection.  So even though some
> >> of the samples in the official samples collection still cause problems
> >> it may be time enable WMV3 decoding within FFmpeg.
> >>
> >> I vote for enabling.  Kostya, what do you think?
> > 
> > Agree. It is already very useful and should be enabled.
> > 
> > Still, I have a sample which shows small artifact. It seems that sharp
> > regions gets a little bit blured. This is almost not visible until the
> > next I frame appears. At this point the discontinuity is clearly visible.
> > 
> > The sample is called Amazon_720.wmv and the artifact is very visible
> > in the scene starting at 00:01:00. I can upload this 80MB sample to
> > mphq if it's not too big (?) or make it available on line to you
> > privately if needed.
> 
> I bet that's one of the files from Microsoft. It's available here:
> 
> http://download.microsoft.com/download/a/d/6/ad6fc147-e95f-4ffd-a2e8-cbd09ca91b00/Amazon_720.exe
> 
> Just unzip the exe file; I guess someone at Microsoft thought a 0.018% 
> reduction in file size is worthwhile.

Yes, that's it.
I've also just found a file which seems to contain B frames. It shows
some artifacts, so I guess it really uses B blocks :
http://gnuage.org/vc1/guitar.wmv

Aurel