Why does cap.get(CV_CAP_PROP_FORMAT) return 0?

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Thank you for your answer. I guess that makes sense, although it is a bit confusing that, when reading from a .bmp file with a fixed format, OpenCV is unable to determine the format of the data.

Is it possible that CV_CAP_PROP_FORMAT doesn't return the CV_<bit-depth>{U|S|F}C(<number_of_channels>) value that I naively expected it would?

I'm going to go ask a different question now...

--wpd

If it works, it should be returning the Mat type you get from the VideoCapture object.

CV_CAP_PROP_FORMAT: Format of the Mat objects returned by retrieve() . (doc)

It just means that your camera drivers, do not support querrying the frame format.

Thanks. I was confused that the "camera driver" for reading .bmp files does not support querying the frame format. From your answer to my other question, it would seem that the default format is CV_8UC3 and that I should be able to assume that in the absence of any other knowledge.

I'm ok with that. I wish it were better documented somewhere.

I commented on that topic how you can propose adaptations for the documents. OpenCV doesn't have a technical writer for the moment, so basically it depends on the help of the community to come up with adaptations, changes and extras.