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Originally Posted by Robert Martens
One being that your dimensions seem to be off; as posted that will simply take your input and scale it directly to 1280x720, stretching the picture tremendously. I take it that's only a typo?
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Should have explained that I'm frameserving from Sony Vegas, and my project settings are 960x576, PAR 1.0667. So it's entering AviSynth already pillarboxed at the correct aspect ratio. I also see on an old computer that I made a project preset of 936x576, PAR 1.0940, which achieves the same thing.
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The other is that you're resizing up horizontally before deinterlacing, which is just more work for QTGMC. The preemptive horizontal resize only speeds up processing if the horizontal dimension is being reduced.
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Yikes, my brain was still in downscaling mode. Thanks for pointing that out!
The AddBorders approach that you suggest is probably more elegant than what I've been doing. Thanks for suggesting it. I'll tackle the other suggestion tomorrow. Cheers