Watching from anywhere, and a camera that sleeps

What turned up that is worth a look:

• Your own "cloud" view of a camera from anywhere — no port forwarding, no dynamic DNS, no vendor server. The camera pushes its video over WHIP to your own VPS and you watch it in a browser; latency is a couple of hundred milliseconds instead of the several seconds HLS costs. https://github.com/OpenIPC/wiki/blob/master/en/howto-self-hosted-cloud-camera.md

• The camera sleeps when nobody is watching: the sensor and the image pipeline stop, not just the encoders. 2.06 W → 1.01 W on a Hi3516EV300 with an IMX335, while RTSP, the API and the microphone keep working. https://github.com/OpenIPC/wiki/blob/master/en/majestic-streamer.md#stopping-the-sensor-and-isp-when-nothing-is-watching

• HLS no longer conflicts with recording — the two together are cheaper: the playlist points at the clip already being written to the card, nothing is held in RAM, and the live edge is about a second behind rather than a whole GOP. https://github.com/OpenIPC/wiki/blob/master/en/majestic-streamer.md#live-hls

• Encrypted recordings on the card: four modes and an honest table of what each one really protects against — the card stolen, the flash cloned, the whole camera carried off. And why the old records.key was not encryption and is gone. https://github.com/OpenIPC/wiki/blob/master/en/recording-encryption.md

• Detections are published in one format for everything: a websocket, an HTTP endpoint, an overlay in the browser, ONVIF metadata, a track inside the recording, and a per-day index the timeline is drawn from. https://github.com/OpenIPC/wiki/blob/master/en/analytics-metadata.md

• Changing the SD card on a running camera: a wizard in the web interface closes the current clip, unmounts the card and waits for the next one — the stream is not interrupted. And an explanation of why, on firmware older than September, pulling the card silently killed the slot until a reboot. https://github.com/OpenIPC/wiki/blob/master/en/sd-card-swap.md

• Raw: a frame straight off the sensor as Adobe DNG, and an editor in the browser — develop it, measure the sensor, calibrate colour against a chart (HiSilicon and Goke). https://github.com/OpenIPC/wiki/blob/master/en/raw-editor.md https://github.com/OpenIPC/wiki/blob/master/en/majestic-streamer.md#raw-sensor-data-as-adobe-dng

• A second camera: a USB (UVC) webcam is published beside the built-in one as a source of its own, with its own streams. The Goke gk7205v200/v500 OTG builds have it first; other platforms follow as they are tested on hardware. https://github.com/OpenIPC/wiki/blob/master/en/majestic-streamer.md#a-second-camera

• Setting audio levels by ear, from the web interface: play a test tone through the speaker, set the microphone level from what comes back, and listen to the result. https://github.com/OpenIPC/wiki/blob/master/en/audio-soundcheck.md

• What to do when the camera has seen something: two hooks — one when movement starts, one when a clip is finished — a worked example with a script and a way to reject false alarms by the size of what moved, and how to get a clip at all on a camera with no card, with GET /video.mp4?duration=N. https://github.com/OpenIPC/wiki/blob/master/en/motion-events.md