Monitor Rotation
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Found this:
M metin Jun 11, 2018, 1:36 AM
This is easy. Go to the monitor settings and scroll down to "Stream" category. There is an option "Rotate" which you can set to 180 degrees. This will add "-vf transpose=2,transpose=2" to the ffmpeg cmd.
Also many cameras have this option built into their web interface.Can not find any "Rotate" options,
Thanks