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feat: encode AV1 temporal layers with VA-API - #379
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The VA-API AV1 encoder now takes L1T2 and L1T3, with WebRTC's reference structure and a rate control for each layer, rather than leaving them to libaom. A frame it cannot encode now falls back to libaom.
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Brings in the work upstream added from October 15 to 17: temporal layers in the VA-API encoders and VP9 spatial layers in the VA-API decoder (devopvoid#379 to devopvoid#381, devopvoid#383, devopvoid#388); a standalone voice activity detector, and checks against using a disposed one (devopvoid#394); the removal of Logging.logThreads (devopvoid#395); upstream's 0.20.0 release and its release workflow changes (devopvoid#391 to devopvoid#393); and docs (devopvoid#378, devopvoid#382, devopvoid#384 to devopvoid#386, devopvoid#389, devopvoid#390). Fork-side adaptations: - Logging keeps this fork's design, in which thread IDs and timestamps come from system properties read at load time. devopvoid#395's thread IDs that are always on and its runtime Logging.logTimestamps are left out. Its logging test change, which logs at INFO, is taken. - The common WebRTC patches of devopvoid#394 are applied on every platform, as upstream does. The data channels desktop capture patch joins the patch list before it is recorded, so the build record covers it too. - The data channels variant leaves out the standalone voice activity detector, and its test carries the media tag. - The release workflow stays this fork's Gradle one. Upstream's Maven-based split into preparation and tag-scoped publication (release-publish.yml and the publish action) is left out, and so is its release notes link to jrtc.dev, which documents upstream's packages. - The Maven files stay deleted, and the README and the docs' version stay this fork's own.
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The VA-API AV1 encoder takes L1T2 and L1T3 now, following WebRTC's reference structure, with temporal ids, an operating point per layer, and a rate control for each layer (without it AMD gives the upper layers next to no bits). A frame it cannot encode falls back to libaom instead of WebRTC switching codecs.