Alaric Snell-Pym on Nostr: I am no ffmpeg or v4l expert, but my experience of graphics in general and the fact ...

I am no ffmpeg or v4l expert, but my experience of graphics in general and the fact that scaling flag helped makes me suspect this v4l device expects the image to be in a very specific form, and will assume it is even if it isn't. So the question is "what form does it expect the image to be in". Is there any command to query settings/capabilities of a v4l device to see if the device driver will tell you?