[Openchrome-users] interleave problem with openchrome driver with SP8000 and TV out

[druyts pascal]

I noticed a strange distortion problem on the TV output on a epia SP8000. 
The problem looks like an interleave problem, but the strange thing is that 
the MPEG stream is not interleaved and does not present any distortion. Even 
stranger, when pausing the movie, the image is flickering, I am not sure of 
what is going on, but it could be that odd and even lines are getting 
continuously swapped.

I know that there are filters to reduce the inconvenience, but those filter 
blur the image and load the CPU, which is already eavily loaded to play the 
MPEG stream. My understanding is that those filters should only have to be 
used if the original stream has been badly recorded.

I also tested the via driver (which  needed minor modifications to compile 
with a 2.6.13 kernel). With that driver, the "interleave" problem does not 
show up and I therefore attribute the problem to the openchrome driver. 
Unfortunetely, the via driver also has  a problem, some pixels --say 5 to 10 
neighbouring pixels one or several horizontal line, but not always the 
same--- have a bad color (usualy dark), as if  the buffer being unreadable 
when the graphic card needs it (because it is accesed by the driver? I don't 
know much about the driver implementation, don't flame me if this hypothesis 
is stupid).

I am using MythTV with the last svn version of the openchrome driver, XvMC 
is not enabled (I understood I have to recompile MythTV with XvMCPro enabled 
to test the HW acceleration) and the ouput is on a PAL TV.

As a conclusion, the output of the via driver is more pleasant than that of 
the openchrome drive, but also shows some problem. I would however prefer to 
use the openchrome driver, beacuse it is open source of course, but also 
because it is , if I understood well,  my only chance to use the hardware 
mpeg decoding in MythTV because Myth does not support  the VeXP extension.

Any idea on how I could resolve this "interleave" problem?

Thanks,

Pascal

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