On 11/20/06, <b class="gmail_sendername">Tom Lichti</b> <<a href="mailto:tom@redpepperracing.com">tom@redpepperracing.com</a>> wrote:<div><span class="gmail_quote"></span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Steven Adeff wrote:<br>> On 11/20/06, David Watkins <<a href="mailto:watkinshome@gmail.com">watkinshome@gmail.com</a>> wrote:<br>>> On 20/11/06, Shawn Rutledge <<a href="mailto:shawn.t.rutledge@gmail.com">
shawn.t.rutledge@gmail.com</a>> wrote:<br>>>> I have an Athlon 64 2400+, have been using it with a Hauppauge WinTV<br>>>> card for a while, and just got a pchdtv HD-5500 card to see if I can<br>>>> get some HD video. Unfortunately due to the projector I'm using
<br>>>> currently the video has to be at 640x480 so I'm not getting the full<br>>>> benefit of it until I get a better projector... I have kernel 2.6.18<br>>>> and attempting to use the DVB drivers that come with it. Installed an
<br>>>> antenna this afternoon, scanned the channels, receiving the signals<br>>>> fine... but my system can't keep up. There are a lot of dropped<br>>>> frames (like I can see 4 or 5 frames in sequence every second or so,
<br>>>> then a pause, then more frames) and jerky audio. I would think this<br>>>> system should be fast enough. I have an nvidia Geforce 5200 card with<br>>>> nvidia drivers and enabled XvMC as described here
<br>>>><br>>>> <a href="http://www.mythtv.org/wiki/index.php/XvMC">http://www.mythtv.org/wiki/index.php/XvMC</a><br>>>><br>>>> I switched to JFS on the partition that stores video files to get the
<br>>>> best possible filesystem performance. hdparm -tT tells me I get 50<br>>>> MB/sec transfer rates. Tried various de-interlacing methods, and even<br>>>> turning de-interlacing off altogether doesn't help. Using Option
<br>>>> "NVAGP" "1". 'Use video as timebase' was off already. Tried using<br>>>> 'Seperate video modes for GUI and TV playback', no difference.<br>>>><br>>>> I'm a little skeptical that /etc/X11/XvMCConfig is being read, since
<br>>>> there wasn't one installed already (it's a gentoo system BTW).<br>>>><br>>>> What else could I be missing?<br>>> Presumably you've already that checked XvMC is apparently working?<br>
>><br>>> 'XvMC found' type messages in the frontend log ( start the frontend<br>>> from a terminal with)<br>>><br>>> $> mythfrontend -v playback<br>>><br>>> and the pop-up 'On screen display' (OSD) is in black and white.
<br>>><br>>> I had issues with my EPIA M1000 on standard definition. XvMC was<br>>> running but not giving me any CPU advantage (CPU load at 65% with or<br>>> without XvMC). Running the frontend as root reduced the load back to
<br>>> where I'd expect it (15%) and enabling realtime priority did the same<br>>> when running as mythtv.<br>>><br>>> I'm afraid I can't explain this, but it worked for me.<br>><br>> First, I would try disabling ALL options that pertain to how video is
<br>> displayed. Disable all deinterlacing, disable OpenGL vsync, etc. Then<br>> go into nvidia-settings and disable all the xvideo options in there.<br>><br>> Now try playing the HD file, and as David says, make sure XvMC is
<br>> being used. If you verify that it is, and your able to play back the<br>> recording without hickups, I would then begin playing with Bob<br>> deinterlacing and OpenGL sync in the MythTV TV Playback options.
<br>><br>> Keep the nvidia-settings sync options all turned off, they should not<br>> be on as Myth has its own OpenGL sync option.<br>><br>> also, search the list, lots of good information on this area.<br>
><br><br>Along with all that, I would check that your modeline is setup with the<br>correct frequency for your area. NTSC requires a multiple of 30, when my<br>system was using an unknown frequency (close to PAL I think) I got tons
<br>of prebuffer pauses, hiccups, etc, playing HD on a dual core P4 2.8GHz,<br>which should have been more than capable of playing HD. When using XvMC,<br>the mythfrontend log will show the average FPS of the display. If it's
<br>not running near your TV standard, you WILL get prebuffer pauses and<br>audio/video sync problems. Mine was running at around 24 FPS average,<br>and the playback was terrible. Once I got my modeline correct and it was
<br>running at 30 FPS (or very close to it, either 29.9 or 30.1) playback is<br>perfect, even without XvMC. I actually have less CPU usage without XvMC<br>than with it, and that is with BOB de-interlace on.<br><br>For reference, my nVidia mode is the built-in '1024x768_60' with NO
<br>defined modelines in XF86Config-4 (or xorg.conf). PAL would probably<br>want '1024x76_50'.<br><br>HTH<br><br>Tom<br><br>_______________________________________________<br>mythtv-users mailing list<br><a href="mailto:mythtv-users@mythtv.org">
mythtv-users@mythtv.org</a><br><a href="http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users">http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users</a><br></blockquote></div><br>This is a very interesting point and describes why my PIV
3.0 GHz system is having such a hard time displaying HD. What do you mean by TV standard and how do you tell the fps? I would love to check this out on my system and see if it is the same thing.<br><br>Allan<br>