I'm pretty new to *actual* programming so I don't really know what you mean by "profiling." I've looked at the code and tried to find places where I think it might be slow but I have no idea how I might be able to narrow down the places that are slowing it down in reality. I believe the most recent change I made might've been a culprit when working in YV12 and I'm pretty sure it'll be a faster still when I take out the upsampling, but beyond that I really have no clue.
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