OK, I went into mythfrontend -> Settings -> TV settings ->
Playback, and added the Bob 2x Deinterlace option, as well as the "Use
video as Timebase" option. This seemed to correct the artifacts
that I was seeing, both in live TV, and in peviously recorded
material. Based ont his, can I assume that the artifacts were
there
becasue of the way the encoded video was being decoded for
display? As opposed to it being a flaw in the way the PVR-250 was
encoding the video in the first place? <br>
<br>
I went on to experiment further with the XvMC hardware decoding, and
that seemed to introduce stutter. I noticed that the CPU
consumption of mythfrontend dropped by 50% when I did this. Based
on this, I assume that when this box is not checked, myth is doing XvMC
software decoding instead? So, one way or the other, XvMC decoding is
being done? <br>
<br>
I did not try libmpeg2 or XV. I gather that XV and XvMC are
mutually exclusive options. Is that correct? And what about
libmpeg2? Is that to be used in combination with either XV or
XvMC? I guess at some point, it will become increasingly
difficult to discern any improvement, as the picture quality gets
closer to nirvana.<br><br><div><span class="gmail_quote">On 4/14/05, <b class="gmail_sendername">Will Dormann</b> <<a href="mailto:wd@pobox.com">wd@pobox.com</a>> wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Larry K wrote:<br>> I'll bet that's my problem, then. FWIW, my recordings are 2.2GB/hour,<br>> which seems pretty reasonable.<br>><br>> I'll try the Bob Deinterlacing when I get home. Thanks! This forum rocks!
<br><br>For the best quality TV-out:<br><br>- Make sure MythTV is compiled with OpenGL Vsync support (Otherwise Bob<br>won't look smooth)<br>- Use a resolution of 800x600<br>- Set Playback option to "Use Video as Timebase"
<br>- Use Bob Deinterlacing<br><br>An earlier version of my tips are here:<br><a href="http://mythtv.info/moin.cgi/NVidiaMX4000HowTo">http://mythtv.info/moin.cgi/NVidiaMX4000HowTo</a><br><br>I'm planning on updating them to work with the recent builds. Probably
<br>once 0.18 is released. The main difference is now it should be set to<br>use XV instead of XvMC (XV has higher CPU usage, but is less "quirky")<br>and also use libmpeg2 for decoding.<br><br><br>-WD<br></blockquote>
</div><br>