Two things that together stop bogus URLs from masquerading as a recording:
PROBE BUTTON in the New Recorder panel. Before you commit to record, hit Probe Source - the capture container runs ffprobe with a 10s timeout against the URL and returns the parsed streams. UI shows green Signal Detected with codec/resolution/fps/audio, or red No Signal Detected with the actual ffprobe error message. For SDI it lists DeckLink devices. Listener-mode sources cannot be probed standalone (would block waiting for a publisher) and the UI says so.
MAIN STATUS LABEL ON THE RECORDING CARD now mirrors the live signal instead of hardcoding Recording. So a recorder pointed at a dead URL goes Connecting... -> Connection error (red) instead of looking like everything is fine. When frames actually start arriving the label flips to Recording (blue) and the dot turns blue. If a previously-good stream drops the label switches to Signal lost (red).
API:
* capture: POST /capture/probe runs ffprobe and returns { ok, streams, format, error? }
* mam-api: POST /api/v1/recorders/probe proxies through to the capture sidecar with a 15s outer timeout
- Accept source_type, source_url, listen, listen_port, stream_key
- Validate: SDI requires device; SRT/RTMP caller requires source_url
- Pass all params through to captureManager.start()
- On stop: if proxyKey is null (network source), include needsProxy flag
in MAM API registration so worker can generate proxy asynchronously
