> or a hardware circuitry linked to the start of streaming from the camera which is difficult to implement (you need to decode the stream in hw). Why would you

> or a hardware circuitry linked to the start of streaming from the camera which is difficult to implement (you need to decode the stream in hw). Why would you need to decode the stream in hw? Simply attach an LED to power-good signal of signal buffer and you are good to go. As long as the data stream is open, the LED is on. It's not even intern level, it's student level circuitry.