I have experimented including using an Intel MacBook Pro, running the same version of the OS which works, and tried a different M1 Mac Mini, TVS and HDMI cables, to rule out any hardware issues but it seems like the M1 Macs are unable to output an interlaced video signal. I have tried the "Alt Click" trick to show all resolutions however the options for '1080i, 1080p' etc are not there, only '1920 x 1080' type resolution options. The setting for 1080i no longer shows up in the Display Settings when the BMD HDMI is connected and the output from the Mac Mini can be seen on test monitors as 1080p. However the Mac Mini has been upgraded to the new Apple Silicon hardware, and we're now struggling to output 1080i 50Hz natively from the Mac. The whole system is running on 1080i 50hz and has been operating without issue for a while. We have a client who has an existing system comprising of various sources including a Mac Mini feeding into an ATEM TVStudio, the output of which is used both for Live Stream and for monitors in the venue including a LED Wall.
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