[AV1] Restore full transforms for target usage 1 - #387
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QSV AV1 quality regressed for quality-focused low-latency encodes because the default AV1 frame header path always selected the reduced transform set, including Target Usage 1.
This restores the intended default: Target Usage 1 uses the full transform set when supported, while Target Usages 2-7 continue using the reduced set. Explicit
ReducedTxSetUsedoverrides and unsupported-hardware handling remain unchanged.Validation:
git diff --checkva/va_version.hFixes: #375