[mythtv] Unichrome/XvMC VLD output segfault

Terry Barnaby terry1 at beam.ltd.uk
Sun Nov 21 08:10:24 UTC 2004

Jarod C. Wilson wrote:
> On Nov 20, 2004, at 1:34 PM, Jarod C. Wilson wrote:
>> I'm running cvs as of Thursday, with the Nov 16 Unichrome package set 
>> from http://www.kingcot.eclipse.co.uk/unichrome/ on an M10000 running 
>> Fedora Core 2. The one deviation is that I'm running the 2.6.9-1.3_FC2 
>> kernel with the DRM module rebuilt against it.
> Don't deviate, dumb-ass. :-) Flipped back to 2.6.8-1.521 and the module 
> provided. Everything works fine now. Playing back 720x480, 8000kbps 
> video with the processor about 20% user, 35% system, 45% idle.
>> Anyhow, the frontend loads up just fine, no problems browsing my 
>> recordings library, XvMC VLD decoding is enabled in the setup, etc. 
>> However, whenever I try to play a recording, I get a segfault. Some 
>> verbose output below. I'm curious what's going on with the "No XvMC 
>> found" line... I'm assuming its a problem w/the Unichrome interaction, 
>> but all the audio stuff doesn't look so good (extra audio buffering is 
>> enabled, too).
> Looks like the Unichrome DRM module doesn't work with 2.6.9, or at least 
> Red Hat's version of it.
>> I'm recompiling a freshly updated cvs copy from today with debug 
>> support enabled, will get a backtrace once the compile finishes. I'm 
>> also going to try the Nov 5 package set, I've seen positive reports 
>> for that one, haven't heard anything about the 16th set.
> Never mind. The Nov 16th package set is fine.
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I would have though that it should have worked with the 2.6.9-1.3_FC2
kernel. Maybe the module was not compiled for this kernel or installed
in the right place ?. If you used my SRPM you need to change the
kernel version values at the top of the file ...

One thing though:

The xorg-x11-libviaXvMC-2004.11.16-1.i386.rpm is broken. I have
reverted to the xorg-x11-libviaXvMC-2004.11.14-1.i386.rpm module.
The xorg-x11-libviaXvMC-2004.11.16-1.i386.rpm library has a fault
where if you try and watch a second video stream, the stream does
not appear or is jerky.

   Dr Terry Barnaby                     BEAM Ltd
   Phone: +44 1454 324512               Northavon Business Center, Dean Rd
   Fax:   +44 1454 313172               Yate, Bristol, BS37 5NH, UK
   Email: terry at beam.ltd.uk             Web: www.beam.ltd.uk
   BEAM for: Visually Impaired X-Terminals, Parallel Processing, 
Software Dev
                          "Tandems are twice the fun !"

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