FFMPEG Error (SDK 10.11.4) - Newbie question

Hi,

I compiled FFMPEG with Blackmagic SDK v 10.11.4. As soon as I enter a simple command like this one

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ffmpeg -i test.avi -f decklink -list_devices 1 dummy

(from the FFMPEG online documentation)

I get the correct list of devices but the result has always an error:

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Could not write header for output file #0 (incorrect codec parameters ?): Immediate exit requested
Error initializing output stream 0:1 --

My question, as a newbie: is it normal?

Thank you very much for an answer,
David.

Yes, it is normal. I don't know that the dummy output value is really needed or doing the right thing.
The other thing you will notice is that you don't have to specify the video format on capturing as the DeckLink autodetect mode will display what the current format on an input is.
You can see this by running ffplay.

Thank you very much for your answer!
Davide