Am 23.10.2020 um 18:46 schrieb Michael Koch:
Am 23.10.2020 um 17:19 schrieb Michael Koch:
Hello,
It seems there is a problem in the v360 filter. This command line
doesn't rotate the correct point to the image center. The default
rotation order should be yaw pitch roll, which means after the
rotation the point with azimut 180° and height +45° should be in the
center. It is nearby, but not in the center. Tested with latest
Windows build, 2 days old.
ffmpeg -i equirectangular_test.png -vf v360=e:e:yaw=-90:pitch=45 -y
out.png
If the rotation is only yaw or only pitch or only roll, then it's
working fine. But all rotations around two or more axes fail.
I'm not sure, but the problem might be in the function
multiply_quaternion() in vf_v360.c
Please compare the signs with this Wikipedia article:
https://en.wikipedia.org/wiki/Quaternion#Hamilton_product
Michael
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