[mythtv-users] Problem with MythTV/HDTV/nVidia

[Steve Malenfant]

I just upgrade to 0.19 and what I've feared for just happened... My 1080i
playback isn't working like it was in 0.18.

I get a bunch of NVP: Prebuffering pause.  My CPU is a P4 2.4Ghz and I'm
running 40% idle playback.  Video is a bit jerky, but not as bad as when bad
stuff happened on 0.18.  The buffering pause seems to happen much faster,
but way more often.

[mythtv at stevexp ~]$ rpm -qa | grep 2.6.15
alsa-kmdl-2.6.15-1.1831_FC4-1.0.10-43.rhfc4.at
kernel-2.6.15-1.1831_FC4
nvidia-graphics7667-kmdl-2.6.15-1.1831_FC4-1.0_7667-68.rhfc4.at

2006-02-19 14:58:07.574 Connecting to backend server:
192.168.11.24:6543(try 1 of 5)
2006-02-19 14:58:07.582 Using protocol version 26
0: start_time: 2923.504 duration: 305.192
1: start_time: 2923.460 duration: 305.202
stream: start_time: 32482.886 duration: 3391.509 bitrate=13745 kb/s
2006-02-19 14:58:10.323 AFD: Opened codec 0x8c3b7f0, id(MPEG2VIDEO)
type(Video)
2006-02-19 14:58:10.324 AFD: Opened codec 0x8cc4cc0, id(AC3) type(Audio)
2006-02-19 14:58:11.680 TV: Attempting to change from None to
WatchingPreRecorded
0: start_time: 7421.167 duration: 291.081
1: start_time: 7421.145 duration: 291.076
stream: start_time: 82457.164 duration: 3234.483 bitrate=18866 kb/s
2006-02-19 14:58:13.150 AFD: Opened codec 0x8cb7680, id(MPEG2VIDEO_XVMC)
type(Video)
2006-02-19 14:58:13.151 AFD: Opened codec 0x8c82100, id(AC3) type(Audio)
2006-02-19 14:58:13.160 Opening audio device '/dev/dsp'.
2006-02-19 14:58:13.160 Opening OSS audio device '/dev/dsp'.
2006-02-19 14:58:13.451 NVP: Forcing decode extra audio option on.
                        XvMC playback requires it.
2006-02-19 14:58:14.616 The realtime priority setting is not enabled.
2006-02-19 14:58:14.633 TV: Changing from None to WatchingPreRecorded
XvMC: picture structure FRAME
2006-02-19 14:58:14.796 Video timing method: SGI OpenGL
2006-02-19 14:58:15.016 NVP: prebuffering pause
2006-02-19 14:58:15.149 NVP: prebuffering pause
2006-02-19 14:58:15.265 NVP: prebuffering pause


Steve

On 2/19/06, Jerry Rubinow <jerrymr at gmail.com> wrote:
>
> On 2/18/06, Steve Meyers <steve-lists-mythtv at spamwiz.com> wrote:
> > I've got a Pentium 4 2.8GHz with an nVidia FX 5500 in my frontend
> > machine.  I'm having a little bit of trouble playing HDTV on it.
> >
> > If I don't enable XvMC, but use libmpeg2, I can play 720p without many
> > problems, but 1080i stutters every 1-2 seconds.  Even 720p stutters once
> > every 10-15 seconds or so.
>
> This sounds like a bandwidth or CPU problem.  What's your CPU usage on
> the frontend when you're playing back?  Are the FE/BE on separate
> computers, and if so, how are they connected?  Are your drives using
> DMA?  Is your video card PCI or AGP?
>
> > If I turn off libmpeg2 and enable XvMC, it plays back with no
> > stuttering.  However, within a 1-5 minutes, it goes berserk.  The vast
> > majority of the screen (90-95%) becomes a blocky purple or green.  If I
> > let that continue, it completely freezes X within 30 seconds.  A
> > ctrl-alt-backspace will get me out of X, so the computer isn't
> > completely frozen.
>
> This I have no idea on.
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