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Problem is, 3D pipelines aren't really set up for generic FIR filters, so the task is to convolute and mutate the traditional 4x4 kernel into something that a GPU understands.To review, the 1D cubic interpolation filter used in Virtual Dub is a 4-tap filter defined as follows: where taps 2 and 3 straddle the desired point and x is the fractional distance from tap 2 to that point.I dropped the older KB entries, but they're basically redundant with the change log in Virtual Dub.I put together a new Athlon 64 based system a few days ago, installed the preview of Windows XP for 64-bit Extended Systems and the prerelease AMD64 compiler, and hacked up the Virtual Dub source code a bit. It plays MPEG-1 files, but nearly all of the assembly optimizations are disabled and none of the video filters work, so it's still far behind the 32-bit version, but it's still neat to be able to experiment with 64-bit code.The code has shipped and is in 1.5.10, but is hard-coded off in .I might resurrect it again as NVIDIA reportedly exposes a number of features in their hardware in Open GL that are not available in Direct3D, such as the full register combiners, and particularly the final combiner.And with AMD64, that means I'm going to have to duplicate and reflow a lot of it.
I've been trying for some time to get YV12 support working perfectly, but at this point it looks like a wash.
The problem is that different drivers and applications are inconsistent about how they treat or format odd-width and odd-height YV12 images.