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2) Do I have to enable the openCL in PD18 settings (I've got it enabled)?
That's only for previewing. It doesn't make any difference when producing.
That statement is totally false for anyone reading in the future. OpenCL in pref setting can be very effective at reducing time during "Produce" operations, it just depends what one has done on the timeline. CL even annotates it applies to render in description. Especially helpful for those cases when one needs to blur part of an entire video, with such one can easily see a very significant reduction in "Produce" time, up to 2X faster is my experience, of course benefit is hardware dependent.
For what it appears MFoist timeline may look like, likely OpenCL will have no benefit, still no reason to state it's only for previewing.
Totally agree, the only way to understand MFoist long encode potential issue, if any, is to get a sample. Appears expectations maybe for Nvidia RTX 2080 GPU (only active GPU in DxDiag) to help significantly on timeline encode with LUT, not a chance in PD18 as was mentioned prior.
Concerning SVRT, the prior clip that was linked had variable framerate. Applicability of SVRT will be hit and miss as it really depends how much framerate variability the exact clip has. If variable and little change, SVRT will work, if variable and large changes because of captured scenes, SVRT will not work.
Lot of potential items at play, sharing a partial timeline of real edits and associated clips the only real way to provide any realistic assistance.
Jeff