System summary:<br><br>Dual P3 1Ghz<br>1Gb RAM<br>Nvidia 5200 -> S-VIDEO to CRT PAL TV (PAL)<br><br>Recordings are DVB-T or PVR-150 sourced from Antenna or Composite video (Telewest Cable box)<br><br><br>So basically I'm playing Interlaced PAL SD @ 50Hz recordings through the TVOUT of my
nvidia.OK?<br><br>So what I don't get here is:<br> Why does the framerate look slow in comparison to <br> a) actual live tv e.g. straight from cable box to TV<br> b) One of my mpegs played back through my MediaMVP?
<br> (What I mean is movement looks just slightly blurred and jerky)<br><br>I've done some diagnostics using mythfrontend -v playback and I'm getting a solid 25fps....<br><br>So that leads me to the following.....
<br><br>1) "Normal" TV is rated at 25 frames per second but as it's interlaced it actually 50 FIELDS per second.<br>2)
The two fields that make up one frame often contain some movement
(otherwise we wouldn't have the de-interlace problem to sort out would
we?)
<br>3) THEREFORE "Normal" Interlaced TV actually has a pseudo 50hz
frame rate (albiet they're not really full frames but sort of half
resolution).<br>4) So if my player deinterlaces and plays at 25fps we
actually get a reduction in perceived frame rate and hence the slight
jerky/blurriness in comparison to live TV.
<br><br>So am I correct in my analysis? Is the mythfrontend actually playing 25 full frames a second or 50 fields a second?<br><br>How can I get the "correct" output of 50 fields a second where potentially the two fields in each frame can contain movement?
<br>Would using a CRT output (RGB to SCART) instead of S-VIDEO help?
(in this respect not just overall quality) i.e. is the NVidia TV-Out
doing something to the timing...e.g. insisting on using 60hz without
telling me thus throwing out the timings, or maybe even forcibly
de-interlacing the picture?
<br><br>Cheers<br><span class="sg"><br>Steve<br></span><br><br>