3a176c5cc8432a343e0f24cd3ce48f05bfbeffa3
Full live investigation of the persistent 503 "deviceBusy" on main-stream ISAPI snapshots (10.0.10.13): ruled out config (byte-identical to a working sibling model), ruled out firmware age (reproduced on both the original V5.8.11 and current V5.11.0 builds, ~15 months apart), and ruled out real resource contention (a full channel-ID sweep shows every ID fails identically except the one hardcoded working value, including nonexistent channels) — pointing at a broken/incomplete ISAPI snapshot handler that mislabels itself as "busy," not a real encoder ceiling. RTSP main-stream frame-grab was confirmed as a working route around it, but given the bug and the sub-stream's real-world plate-read accuracy problems, the owner decided to replace the DS-2CD1047G3H-LIU units rather than carry an ffmpeg/RTSP dependency to work around vendor firmware. Ingested the vendor datasheet as a source page along the way. Claude-Session: https://claude.ai/code/session_01FWncR69HgGPuei1dLrW3cU
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