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
