[mythtv] [mythtv-commits] Ticket #3035: 1080i source material playback results in solid blue video with Via-XvMC

R. G. Newbury newbury at mandamus.org
Wed Feb 7 22:07:11 UTC 2007

Brian Teague wrote:
> On Tue, 2007-02-06 at 20:05 -0800, Paul Bender wrote:
>>>> I think i readed somewhere the unichrome chipset only supports up
>> to 
>>>> 1024x1024. Perhaps thats the problem?
> For the original Unichrome, this is true.  However, the Epia SP
> motherboards sport the newer Unichrome Pro chipsets, which can decode a
> 1080i stream.  Unfortunately, the video chipset is shared memory, and
> even the maximum setting (64 Mb) is not enough VRAM to allocate 16
> decoding buffers.  I've attached a patch to ticket #3035 that changes
> the value to 14 buffers, which allows playback of 1080i content.
> I'm running it on an Epia SP800, which can just barely handle HD
> playback.  There are a few other tweaks I made (buffering, real-time
> priority for the decoding thread) that help matters immensely.  However,
> I havn't had time to test those changes in the mythtv-vid branch (as I
> was asked to do the last time I posted the patch, on ticket #1842).
> When I have time to do so, I'll post the full patchset there and on
> #3035.
> Regards,
> Brian
> --
> Brian Teague
> teague at wisc.edu
> The Laboratory for Molecular and Computational Genomics
> If in any problem you find yourself doing an immense amount of work, the
> answer can be obtained by simple inspection.

This is fantastic news. The buffer problem explains why we cannot 
otherwise get HD from the VGA output.

I have a number of questions, the answers to which would best go into 
the wiki. If you could steal a moment:

What are you running: SVN head, with your patch?
Are you using the openchrome driver? SVN versions?
How do you set the 'real time decoding' thread?

Since I now have an HD capable monitor, presently at work, but it might 
just migrate...It only weighs about 10 pounds!..


              R. Geoffrey Newbury			
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