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Q&A

How do you rotate webcam feed by 90 degrees?

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When I view my document camera's feed in guvcview it is in landscape mode. I want it to capture things in portrait mode, since I usually take photos of documents.

Currently, I have to rotate all the images after I take them. It would be much nicer if the capture utility could have them rotated to begin with.

How do I rotate the feed by 90 degrees into portrait?

I am open to using a different capture program.

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mpv --video-rotate=90 --profile=low-latency --untimed av://v4l2:/dev/video0

Press s to take the picture.

/dev/video0 is usually the right file, but if the command fails with "inappropriate ioctl for device", try with other ones listed in printf '%s\n' /dev/video*.

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