[mythtv-users] Frontend 0.24-fixes segfaults when starting playback using opengl

[Michael T. Dean]

On 08/05/2012 03:54 AM, Jan Ceuleers wrote:
> Fellow mythical TVians,
>
> Yesterday I upgraded the OS of my frontend from Ubuntu
> 11.04 to Ubuntu 11.10, since 11.04 reaches end of support
> in a few months. [I don't yet want to upgrade to 12.04
> since this forces a simultaneous upgrade to MythTV 0.25,
> and I'll do that first while still on 11.10.]
>
> As you would expect this led to some problems, one of
> which is that the playback profile I was using prior to
> the upgrade causes the frontend to segfault after
> commencing playback of a recording: audio and video
> playback begins, but the frontend crashes immediately
> afterwards.
>
> I was able to obtain reasonable performance by switching
> to the CPU++ profile; only the OSD looks a bit flickery
> when fast-forwarding but that's not a real problem.
>
> Interestingly, despite the name of this playback
> profile, it doesn't make an observable dent in CPU
> utilisation at all.
>
> So this isn't really a huge issue for me, and I realise
> that 0.24 doesn't get active developer attention any
> more. Still, if anything comes to mind to anyone I'd be
> grateful.
>
> System info:
>
> CPU: Intel Core i3-540 (3GHz)
> Kernel: Linux fe3 3.0.0-23-generic #39-Ubuntu SMP Thu
>          Jul 19 19:19:11 UTC 2012 x86_64 x86_64 x86_64
>          GNU/Linux
> OpenGL: glxinfo outputs several pages of info,
>          including the fact that direct rendering is
>          being used
> X: compiz disabled ("Gnome Classic")
> MythTV: 2:0.24.2+fixes.20120409.e9a0ecb-0ubuntu0mythbuntu4
> Content: MPEG2-encoded SD video recorded using Hauppauge
>           HVR-1900 tuners
> Playback: via HDMI on a Sony TV at 1360x768
> Audio: device 'hdmi:CARD=Intel,DEV=0' ch 2(2) sr 48000
>         sf signed 16 bit reenc 0
>
> Many thanks, Jan

One thing I'd recommend is using Normal or High Quality Playback Profile 
group, rather than CPU++.  All of the CPU<whatever> Playback Profile 
groups have been removed from 0.25+, since there was nothing useful left 
of them after removing PVR-350 decoding support and XvMC support.

Mike