I'm a little late to this thread, but I've got similar issues here and wanted to share my experiences with the list. Since 0.19 I've been trying to playback
and watch live more hdtv programs. My setup is:<br>
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FC3 per Jarod's Guide<br>Most recent Myth 0.19 from ATRPMS<br>
P4 2.6 GHz<br>
Soyo P4RC350 Motherboard, onboard video disabled.<br>
512 MB<br>HD3000 QAM capture of 1080i<br>
Kernel 2.6.12-1.1381_FC3<br>NVidia FX5200 driver 7676<br>Standard XVMC playback enabled<br>
1280x768 LCD Monitor connected via VGA<br><br>HDTV playback isn't possible without XVMC (CPU ~99%), but since mythtv 0.19, its acceptable to use it now that the OSD doesn't flicker all over (CPU ~45-50%).<br><br>
I've varied all the tv playback settings I could think of and the only thing I have found that helps the issue of many<br>NVP: prebuffering pause <br>followed by<br>WriteAudio: buffer underrun<br>and so on...<br><br>is to disable deinterlacing. It doesn't matter which form of deinterlacing I use, kernel, bob, linear, one field, whatever, I still get the audio buffer underruns which are clearly audible and noticeable during playback as audio glitches. CPU is always 45-50% with or without deinterlacing. With deinterlacing disabled, the playback is perfect, and the prebuffering/underrun messages are absent from the log, but since I have a progressive display, interlacing artifacts are present (and obnoxious for a stickler like me). I think someone else mentioned this but I've found this is consistent for live tv and for recordings, whether or not the recording is finished or not. I tried to carefully check the playback of a recorded program, and find that the underruns don't happen at the same place everytime. When I disable deinterlacing they are gone. These are the experiences for 1080i source material.
<br><br>For 720p source material, I find something strange. For live TV, when deinterlacing is enabled, playback is smooth and perfect, and I do not see prebuffering pauses and no underruns/no audio glitches. When it's disabled, I get both prebuffering pauses and underruns/audio glitches. For recorded 720p playback, I find pretty much the opposite: deinterlacing enabled, prebuffering pauses/underruns/audio glitches; deinterlacing disabled, perfect playback, but lots of prebuffering pauses and no underruns/audio glitches. Strange behavior indeed.
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