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<blockquote data-quote="CyberSimian" data-source="post: 1269183" data-attributes="member: 141969"><p>I am not sure that I have understood the precise nature of the problem that you are experiencing, but in the past I have had a problem with "juddering", or "jerky" video, but I never looked at the rendering graphs to see if there was a correlation. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /></p><p></p><p>Specifically, the problem that I had was evident when the camera panned horizontally, or with a horizontally-scrolling news tickertape (e.g. on the "BBC News" channel), or with vertically-scrolling programme credits. Some part of this is definitely due to de-interlace processing.</p><p></p><p>I have two test files on my system that exhibit jerky horizontal panning. For the first file I was able to cure the jerky horizontal panning by using a different setting for the de-interlace processing <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite24" alt="(y)" title="Thumbs Up (y)" loading="lazy" data-shortname="(y)" />. Unfortunately, I have not been able to find a de-interlace setting that will cure the jerky horizontal panning shown by the second test file <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" />.</p><p></p><p>Allegedly, broadcasters switch frequently between progressive and interlaced video (even within the same scene in a programme <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite9" alt=":eek:" title="Eek! :eek:" loading="lazy" data-shortname=":eek:" />), and certain graphics adapters are not able to switch quickly enough to avoid a visible discontinuity in the video output. Note that this is not necessarily related to the performance of the graphics adapter -- some high-performance adapters designed for games can show this problem, while some lower-specified adapters do not show it.</p><p></p><p>I am not sure whether my de-interlacing problem is the same as the video signal switching rapidly between progressive and interlaced (there may be two different problems). I am also not sure whether this is the problem that you have, or whether your problem is completely different. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite5" alt=":confused:" title="Confused :confused:" loading="lazy" data-shortname=":confused:" /></p><p></p><p>-- from CyberSimian in the UK</p></blockquote><p></p>
[QUOTE="CyberSimian, post: 1269183, member: 141969"] I am not sure that I have understood the precise nature of the problem that you are experiencing, but in the past I have had a problem with "juddering", or "jerky" video, but I never looked at the rendering graphs to see if there was a correlation. :( Specifically, the problem that I had was evident when the camera panned horizontally, or with a horizontally-scrolling news tickertape (e.g. on the "BBC News" channel), or with vertically-scrolling programme credits. Some part of this is definitely due to de-interlace processing. I have two test files on my system that exhibit jerky horizontal panning. For the first file I was able to cure the jerky horizontal panning by using a different setting for the de-interlace processing (y). Unfortunately, I have not been able to find a de-interlace setting that will cure the jerky horizontal panning shown by the second test file :(. Allegedly, broadcasters switch frequently between progressive and interlaced video (even within the same scene in a programme :eek:), and certain graphics adapters are not able to switch quickly enough to avoid a visible discontinuity in the video output. Note that this is not necessarily related to the performance of the graphics adapter -- some high-performance adapters designed for games can show this problem, while some lower-specified adapters do not show it. I am not sure whether my de-interlacing problem is the same as the video signal switching rapidly between progressive and interlaced (there may be two different problems). I am also not sure whether this is the problem that you have, or whether your problem is completely different. :confused: -- from CyberSimian in the UK [/QUOTE]
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