Rotate webcam as well as screen (portrait mode)
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TL;DR: Is it possible to rotate by 90 degrees the feed of a built-in screen webcam? I have 2 screen monitors, one in landscape and one in portrait mode. The webcam is on the "portrait" monitor, the "landscape" monitor doesn't have a rotation capability (so I cannot switch them). The display on the second screen is rotated using xrandr, via arandr. However, the webcam feed is still filming as if there was no physical rotation, which is a problem for videoconferencing. I would like a way to tweak the video feed at driver level so that I can use it in other applications. I have tried to use v4l2-ctl but I cannot find a "rotate" features (while there are many configuration options for contrast/hue/etc.). I can use My distribution is Archlinux but I don't think it's relevan