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Originally Posted by benwaggoner
Also, multithreaded decode speed isn't THAT important a feature for ffmpeg, which is mainly for transcoding
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True, the decoding speed increase is no longer useful for a lot of companies. Security is often more important.
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AV1 is MUCH better designed for both HW and multithreaded SW decoders than VP9 and earlier, which had limitations in the loop filter and frame signaling that made them almost single-threaded.
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One of those bottlenecks in thread scaling, what I'd call entropic state sharing across frames, is still there in AV1. This is to me something that was decided irrespective of SW decoding. Another sign that indeed the interest in it is only transitory.
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We'll probably have a good sense of the fundamental real-world decoder perf differences between HEVC and AV1 in 2019.
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And in 2020, hopefully, new products will all have HW decoding of AV1, so that would then no longer matter.