[Openchrome-users] HW mpeg2 decoding artefacts

[Andrey Liakhovets]

>> I've got 16x16 square artefacts while playing MPEG2
video
>> on EPIA SP8000 with `mplayer -vo xvmc -vc ffmpeg12mc'.
>> There are no artefacts when I play it with `mplayer -vo
xv'.
>> 
>> These are video fragments (856x768, 33 frames, 1.2 Mb
each):
>> 
>>      http://rapidshare.de/files/13628854/01_33.avi.html
>>      http://rapidshare.de/files/13629424/04_36.avi.html
>>      http://rapidshare.de/files/13629742/07_39.avi.html
>>      http://rapidshare.de/files/13629988/10_42.avi.html
>>      http://rapidshare.de/files/13630257/11_43.avi.html
>>      http://rapidshare.de/files/13630931/13_45.avi.html

>> Nearly all artefact squares look like
>> some 16x16 part of a frame.
>> It seems that artefacts disappear at (or after?) key
frame.

> Hi!
>
> I can't see these artifacts neither with hw decoding xine
nor with mp2player.
> Could they be an mplayer issue?
>
> /Thomas

I've tried mp2player 1.2.3 (from sourceforge)
and I have not seen any artefacts in the videos above.
BTW, mp2player does not show the first 16 frames of any
video.

But in 2 videos below both mplayer and mp2player do show
artefacts:
        http://rapidshare.de/files/13766742/856x768.mpg.html
        http://rapidshare.de/files/13767005/c1_1.mpg.html
Unfortunately, all these artefacts are green and don't look
like pieces of the image.

The 1st video is 856x768, 51 frames, 1.8 Mb.
MPlayer shows a green rectangle at X=480..511, Y=736..751
in frame 25, then a green square at X=480..511, Y=736..767
in frames 26-31.
mp2player shows the same in frames 9-15.

The 2nd video is 1024x768, 101 frames, 3.5 Mb.
MPlayer shows a green square at X=160..175, Y=656..671
in frame 81, then it increases to the left in frames 82-91
(with some green "pixels" added).
mp2player shows the same in frames 65-75.

All the files mentioned are also available at
 ftp://ftp.roverbook.com/Others/EPIA/

Andrey Liakhovets