I've recently tackled the task of restoring all of my VOB music video files so they look acceptable on high resolution screens.
However, its seems in nearly every telecined VOB I tackle, tfm().tdecimate() or even tfm().tdecimate(cycle=5) will always leave annoying duplicates in parts of the video. Sometimes there are so many that motion is actually smoother if I leave it undecimated. Or some cases, a cross-fade will have duplicates on one scene but not on the other.
Am I missing something really simple?
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You have to look at each video, before doing IVTC, to make sure you understand the cadence. TFM is a pretty good field matcher, but it sometimes needs to be tweaked, and TDecimate most definitely needs to have the Cycle/CycleR parameters adjusted for some videos.
What method do you use to determine whether there are duplicates? Remember, you often need to first deconstruct the video into fields, using a non-blended Bob or a Separatefields(), so that you truly understand the decimation pattern. Looking at the video by simply viewing frames will not show you what you need to know.
An untouched VOB or M2V sample from a DVD might help. One that shows the problem after a simple IVTC (but without the actual IVTC).