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No, jpsdr, you didn't suddenly come up with the obvious solution that nobody else has considered. There are reasons nobody uses slice based threading. The most obvious one is that if you're working with video you already have your input split up in neat discrete chunks for you: they're called frames. Splitting these chunks further just adds complexity for no real gain at all. I'm pretty sure it's also worse performance wise (for many reasons, especially for spatial filters where you might have to handle overlapping slices) but I haven't benchmarked it.
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