On 2023-06-20 09:23, Lennart Sorensen wrote:
Supposedly HDMI is using some of the blanking space to send audio, so I guess it has some use.
Is this documented anywhere? Sure the audio is sent over the cable, but why should there be such a thing as a blanking interval on a digital system? The blanking interval was used to sync the camera and TV. There is absolutely no need for that with a digital signal. Of course there is a sync method with digital, but that could be contained in the data. When you have a digital signal, multiplexing of different data, including sync, is trivial.
Read about Real Time Protocol for info on how this is done for audio and video over IP.
https://en.wikipedia.org/wiki/Real-time_Transport_Protocol
HDMI is sending uncompressed frames
I have Rogers IPTV. The TV comes over IP via the cable. That would most certainly be compressed, as was the digital TV I had before it. There are HDMI cables between the Rogers box and my A/V receiver and from the receiver to my TV. Are those cables carrying uncompressed video? I doubt it, considering the signal Rogers distributes originated with ATSC from the broadcasters.
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