Resampling - again

nepomuk wrote on 2/16/2019, 5:51 AM

VMS16: Rendering 1920x1080p30 mp4 source files (from a mobile phone) to 1920x1080i29.97 (for Blu-Ray) always triggers the (Smart) Resampling and produces ugly blended fields, only because the source file is not exactly 29.97fps but slightly off, say 30.007fps or 29.884 for example. So far that's by design it seems which I understand.
However, even disabling the Resampling does not help to prevent the field blending. The only way I found which seems to solve the issue is to set the rendering quality to Preview or Draft. The higher quality settings produce blended fields even though the (smart) resampling is disabled. I think this is a bug.

Secondly, I found the rendering process behaves different when the Resampling is disabled via the Switch or via the Preferences menu. Confused ...…..

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nepomuk wrote on 2/19/2019, 10:38 AM

Thanks. This sheds some light on the mystery. 🙂
Unfortunately such info is missing in the handbook and in the help. It took me quite some time to draw my own conclusions based on lengthy experiments.

Thanks everyone for contributing to the discussion.

EricLNZ wrote on 2/19/2019, 7:03 PM

I see the field differences (which were not expected result for me) are caused by the frame rate adaption. This seem to override the disabled resampling in some way. If you set the frame rate to 1 or 0.5, disabled resampling behaves as expected.

I will check if former Vegas Pro or Movie Studio versions behaved same way.

Edit:

Same behaviour in Vegas Pro 13. If the playback rate is altered to anything else but even divided rates, disabling resample fails. Disabled resample works the way expected for the frame rates of 1 and 0.5 and 0.25. It seems if Vegas Pro or Movie Studio fails in using even doubled frames it falls back to resampling instead.

So in the end all I can do is to state what nepomuk already reported in his very first post, except of there is no difference on my system between the way I select the resampling mode.

Interesting. I wonder if it's related to a problem I've encountered with VMS15Plat and earlier. I haven't checked VMS16Plat.

Altering the play speed of interlaced clips with Smart Resample or Force Resample with play speed values of 0.500, 0.450, 0.400, 0.350, 0.300 and 0.250 results in VMS behaving as if resampling is disabled. As a work around if I want to slow a clip down to half speed I use 0.490 or 0.510

nepomuk wrote on 2/22/2019, 6:34 AM

Just to let you know that the issue with the blended fields which I noticed is solved. The reason was the GPU sourcefilter/indexer which I have been using for analyzing the fields. All ok now. Sorry for the confusion about the blended fields.