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MediaPortal 1
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Help with smooth video playback (jitter/stutter troubleshooting)
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<blockquote data-quote="Owlsroost" data-source="post: 694837" data-attributes="member: 83973"><p>Basically, the refresh rate of a PC video card output can't be locked to a video source (which is what <strong>does </strong>happen in STBs, DVD players, VCRs etc).</p><p></p><p>Windows makes sure that the video frames are 'presented' to the screen at the correct rate, so if this is different to the display refresh rate then the renderer has drop or repeat frames - otherwise video and audio would slowly drift out of sync.</p><p></p><p>What ReClock (and the MP Audio Renderer) do is modify the direct show graph render 'clock' so that video frames are presented at exactly display refresh rate (or a multiple of it) - to maintain audio/video sync they have to re-sample/timestretch the audio to match. They can only do this for audio which is decoded in the PC - so it's not possible to bitstream AC3/DTS etc in this case.</p><p></p><p>Ignore MaxLine (it's just the max value of the Windows display raster line count). PCD is ratio of 'real' time versus 'render clock' time - if ReClock etc is modifying the render clock this will be higher/lower than 1.0</p><p></p><p>The 'sawtooth' red line is expected if you are playing 24Hz video on a 60Hz display.</p><p></p><p>To summarise, you need to try and set the display refresh to as close to 59.94Hz as you can - try playing with Custom Resolutions in the nVidia control panel - this will minimise the frame drops/repeats. This is the best you can do for live TV. For Video, using ReClock etc will also fix the problem.</p><p></p><p>Tony</p></blockquote><p></p>
[QUOTE="Owlsroost, post: 694837, member: 83973"] Basically, the refresh rate of a PC video card output can't be locked to a video source (which is what [B]does [/B]happen in STBs, DVD players, VCRs etc). Windows makes sure that the video frames are 'presented' to the screen at the correct rate, so if this is different to the display refresh rate then the renderer has drop or repeat frames - otherwise video and audio would slowly drift out of sync. What ReClock (and the MP Audio Renderer) do is modify the direct show graph render 'clock' so that video frames are presented at exactly display refresh rate (or a multiple of it) - to maintain audio/video sync they have to re-sample/timestretch the audio to match. They can only do this for audio which is decoded in the PC - so it's not possible to bitstream AC3/DTS etc in this case. Ignore MaxLine (it's just the max value of the Windows display raster line count). PCD is ratio of 'real' time versus 'render clock' time - if ReClock etc is modifying the render clock this will be higher/lower than 1.0 The 'sawtooth' red line is expected if you are playing 24Hz video on a 60Hz display. To summarise, you need to try and set the display refresh to as close to 59.94Hz as you can - try playing with Custom Resolutions in the nVidia control panel - this will minimise the frame drops/repeats. This is the best you can do for live TV. For Video, using ReClock etc will also fix the problem. Tony [/QUOTE]
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