Module snapshot 

Snapshot extraction: a single JPEG frame either from recorded footage at a timestamp, or live from the camera stream right now.

Functions

snapshot_at

Extract one frame from recorded footage at at.

snapshot_live

Grab one frame live from the camera stream (sub-stream preferred).

snapshot_live_raw

Reusable inner that captures one live frame and returns the raw JPEG bytes. Backs the public snapshot_live handler path and is reused by the snapshot scheduler. Identical behaviour; kept as a distinct entry point so background callers don’t depend on the route-facing wrapper.