Mailing List Archive: MythTV: Users

XvMC problem on an EPIA SP board with MythTV 0.21

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dazzle at edazzle

Apr 25, 2010, 4:23 AM

Post #1 of 4 (384 views)
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XvMC problem on an EPIA SP board with MythTV 0.21

I have been running MythTV 0.21 (self-compiled using latest fixes) on a
modified version of Debian Etch (Debian 4) using a self-compiled 2.6.24.7
kernel and have ironed out just about all the problems with it and it runs
very well using VIA-VLD XvMC for MPEG2 accleration with the openchrome
drivers. I am using a VIA Epia SP13000
(http://www.via.com.tw/en/products/embedded/ProductDetail.jsp?id=261).

The only problem I am continually coming up against is when a recorded video
(from a Hauppage Nova-T-500 using Freeview) as any broadcasting glitches
(i.e. due to a low / bad quality signal) the MythTV frontend locks-up
completely and if you try to kill X the whole machine locks up and you have
to do a hard restart. I am using the CPU-- playback profile and have set
everything to Via-VLD with xvmc-blit using Bob 2x and Onefield for the
deinterlacers, and I am getting almost 0% CPU utilisation when I check top.

If I move to the normal playback profile using libmpeg2 and xv then it
passes over the broadcast glitches in the recorded file and keeps playing
with no problems whatsoever, this is impractical to use on the EPIA-SP all
the time because it uses to much CPU power.

When it does crash using XvMC the mythfrontend log just throws out lots of
'NVP prebuffering pause' and 'WriteAudio buffer underun' errors, top still
shows the CPU utilisation at almost 0%.

I have tried just about everything setting I can think of but cannot fix
this problem so I am coming to the conclusion that it is a bug in either
MythTV and / or the Openchrome XvMC implementation. I have also tried runing
MythTV 0.22 as well but it runs too slowly on the hardware.

Any help would be appreciated,

Paul

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udovdh at xs4all

Apr 25, 2010, 4:32 AM

Post #2 of 4 (361 views)
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Re: XvMC problem on an EPIA SP board with MythTV 0.21 [In reply to]

On 2010-04-25 13:23, Paul wrote:
> When it does crash using XvMC the mythfrontend log just throws out lots
> of 'NVP prebuffering pause' and 'WriteAudio buffer underun' errors, top
> still shows the CPU utilisation at almost 0%.

I ran MythTV on Epia's.
Never had the backend or the frontend near 0% unless something was
wrong.
I used SP8000 and EN12000, all fanless. And yes, I did use XvMC.
I never really has the issues you describe although the errorcount as
shown by the dvb-apps was not so low.

Below is a patch that my Epia's needed...

Udo

--- mythtv/libs/libmythtv/util-xvmc.h 2009-02-22 17:37:57.000000000 +0100
+++ mythtv/libs/libmythtv/util-xvmc.h 2009-02-22 17:37:09.000000000 +0100
@@ -53,7 +53,7 @@
num_xvmc_surf(1),
needed_for_display(1),
min_num_xvmc_surfaces(8),
- max_num_xvmc_surfaces(16),
+ max_num_xvmc_surfaces(14),
num_xvmc_surfaces(min_num_xvmc_surfaces),
aggressive(false) {}

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richard.e.morton at gmail

Apr 25, 2010, 4:41 AM

Post #3 of 4 (361 views)
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Re: XvMC problem on an EPIA SP board with MythTV 0.21 [In reply to]

I used sp13000 for sometime; here is how I installed it; not sure if
it will help
http://www.mythtv.org/wiki/VIA_SP13000
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richard.e.morton at gmail

Apr 25, 2010, 4:42 AM

Post #4 of 4 (359 views)
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Re: XvMC problem on an EPIA SP board with MythTV 0.21 [In reply to]

forgot to say; video also came from novat500 / freeview in the UK.
R
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