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Multi-threading:
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- postfilter (!1086) and film-grain threading;
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- in first-pass of frame threading with tile threading enabled, it may make sense (assuming no temporal interference from ref_mvs or seg_id) to first parse the tile marked as the one used to update the output CDF, since that would unblock the subsequent thread's pass 1. This is only true if use_ref_mvs=0 and segmentation.temporal_update=0;
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- threading can become a generic worker queue (one tile_sbrow symbol parsing/recon, one sbrow postfilter(s)) and then use a generic single threadpool instead of separate tile/frame[/postfilter?] ones (see also #206);
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- threading can become a generic worker queue (one tile_sbrow symbol parsing/recon, one sbrow postfilter(s)) and then use a generic single threadpool instead of separate tile/frame[/postfilter?] ones (see also #206; !1252);
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- by not adding invisible frames to `out_delayed[]` and/or growing it so it can be bigger than the number of frame threads (and thus making the indexing between `out_delayed[]` and the actual frame thread doing the decoding independent), we could grow concurrency and scalability on typical sequences with frame-multithreading enabled.
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Removing redundancies:
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