[mythtv] Unichrome/XvMC VLD output segfault

Terry Barnaby terry1 at beam.ltd.uk
Sun Nov 21 20:09:40 UTC 2004

Jarod Wilson wrote:
> On Nov 21, 2004, at 00:10, Terry Barnaby 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.
> Okay, not completely...
>> Hi,
>> I would have though that it should have worked with the 2.6.9-1.3_FC2
>> kernel.
> Likewise. :-)
>> 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 ...
> I did use your srpm, installed it and modified the spec file for the new 
> kernel. Everything built and installed fine.
>> 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.
> Aha, good to know. That's exactly the behavior I reported in a 
> follow-up. I'll revert to the 11/14 build.
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I will try and check the kernel SRPM. If you got the kernel version and 
release correct it should have been installed in: 

Could you check your built RPM to check if this was the case ?

(rpm -ql kernel-via-drm)


   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
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