DuplicateOutput1 returned E_ACCESSDENIED ~8815x even with PER_MONITOR_AWARE_V2
confirmed on the capture thread (thread_is_v2=true) — so DPI was NOT the cause.
The real cause: DXGI permits only ONE IDXGIOutputDuplication per output, and on
ACCESS_LOST you MUST release the old one before re-duplicating. Our recovery
(try_reduplicate / recreate_dupl) created the NEW duplication while the OLD
self.dupl was still alive → the output stayed held → DuplicateOutput1
E_ACCESSDENIED and the legacy fallback returned a BORN-LOST dup. It never
converged because there was always exactly one stale dup alive at creation
time. The initial open() works precisely because there's no prior dup; Apollo
is clean because it releases (dup.reset()) before every re-DuplicateOutput.
Fix: make self.dupl an Option and set it to None (drop → release the output)
BEFORE duplicate_output in try_reduplicate and before reopen_duplication in
recreate_dupl, then Some(new). acquire() gets a None-guard that synthesizes
ACCESS_LOST (routes into recovery) so a transient None can't panic. All
ReleaseFrame/AcquireNextFrame sites updated for the Option.
This is the documented DDA recovery requirement and the one thing that
distinguished our failing DuplicateOutput1 from Apollo's working one.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
enricobuehler
da43b5e8d3