[FFmpeg-devel] [PATCH] FFV1 rectangular slice multithreading
Fri Oct 15 00:54:28 CEST 2010
On Thu, 14 Oct 2010, Jason Garrett-Glaser wrote:
> Also while you're playing with FFV1, I mucked with the contexts a
> while back. I was never able to get a very large improvement, but
> here's some of the ideas I tried:
> 1. Base some (or all) of the contexts on previous residual values
> instead of neighboring pixels (it was almost equivalent in
> compression, but I'm curious how much a combination of that and the
> current approach could help). The bonus of this method is you can
> combine it with FFV2's pixel ordering to allow decode/encode SIMD of
> the median prediction.
Using decoded neighbors is ok if the bitstream order is striped too. That
also allows simd of context computations.
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