i2s is a standardized interface for the (internal) transmission of digital audio data.Yeah that would be my workaround, maybe they can reach out to more people
with hdmi than i2s, just as a thought.
i2s over HDMI has nothing to do with normal HDMI and is not compatible with it.
Usually i2s is used for internal transmission in a device over short distances.
But in order to be able to transmit it over longer distances, the i2s signal is converted into LVDS (low voltage differential signaling) for transport via HDMI (cable). Similar to balanced, every signal is transmitted in + / - / ground.
However, this also means that data from i2s to i2s via HDMI (or vice versa) cannot be transmitted directly, but requires converter i2s to HDMI or HDMI to i2s)
Devices with i2s over HDMI interface can transmit the digital data to one another via an HDMI cable. For example, media players, external USB interfaces, etc. can transmit their data to a DAC, even over several meters.
Boards with i2s output or input (such as XMOS / Amanero USB interfaces, receiver boards, DAC boards, various DIY areas) can be connected to devices with i2s over HDMI interface using converters.
Or two i2s devices with two converters can be connected over several meters.
The HDMI connector was used for the external transmission of the i2s signal because it had enough contacts, was cheap and the HDMI cables were also available.