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ffmpeg -re -i rtmp://server/live/streamname \ -c:v rawvideo -pix_fmt uyvy422 -vf scale=720x576 \ -c:a pcm_s16le -ar 48000 -ac 2 \ -f nut - | /bmd/bmdplay -C 0 -m 2 -f pipe:0

Kindly share the exact command to take this rtmp stream to Decklink Studio 4K card(SDI).

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As the docs say,

you need the Blackmagic DeckLink SDK and you need to configure with the appropriate --extra-cflags and --extra-ldflags. On Windows, you need to run the IDL files through widl

If so, run

ffmpeg -re -i rtmp://server/live/streamname -c:v rawvideo -pix_fmt uyvy422 -vf scale=720x576 -c:a pcm_s16le -ar 48000 -ac 2 -f decklink "Device"

where Device is to replaced with the name of 'Decklink Studio 4K' as indicated by ffmpeg -f lavfi -i nullsrc -f decklink -list_devices 1 dummy

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