[Libav-user] Get input device formats

[Timur Guseynov]

I've been trying to find out the way to get capabilities of my webcam like
resolution, pixel format, fps etc. I've tried using
AVDeviceCapabilitiesQuery, but after creating it, it was shown as NULL
pointer.

I've seen command like this
ffmpeg -f v4l2 -list_formats all -i /dev/video0

How can I implement something like this in C++?
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