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How to overlay NDI stream with alpha channel

Par : Adrian Cho
Can anyone advise how I can overlay an NDI stream with animated graphics onto an existing video signal? I know I can do this in software using something like OBS but would prefer a hardware solution. I know there are hardware NDI to HDMI or SDI converters but I’d still have to get the overlay to happen and I’m also not sure whether this would require having the NDI output split into separate key and fill feeds. Thanks.