[FFmpeg-user] Causes of color bars?

Carl Zwanzig cpz at tuunq.com
Tue Jul 14 10:29:26 EEST 2020

On 7/13/2020 8:47 PM, Simon wrote:
> So now, assuming my logic is sound, my question would be how can ffmpeg
> detect the connected signal is present (it "knows" which channel is "live")
> and yet not read the video signal?

Decklink boards are _very_ touchy about formats and parameters. Try setting 
at least the resolution and frame rate on the input and see if that helps.

I don't guarantee these, but it's a start:
-f decklink -pix_fmt uyvy422 -s 720x486 -r 30000/1001 "DeckLink SDI 4K"



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