On Wed, Dec 2, 2020 at 11:11 PM Michael Koch <[email protected]> wrote:
> Am 01.12.2020 um 19:56 schrieb Michael Koch: > > Hello, > > > > there seem to be some problems in the v360 filter with "perspective" > > output. > > Tested with the latest Windows built, 2 days old. You can reproduce > > this with any equirectangular input image. > > > > ffmpeg -i equirectangular_test.png -lavfi v360=e:perspective -y out1.png > > > > The output of the above command has two problems: > > -- The center of the input image is not mapped to the center of the > > output image. For most other projections the image center is preserved. > > -- The output is mirror reversed (which means you cannot read text). > > > > Both problems can be corrected with this workaround: > > > > ffmpeg -i equirectangular_test.png -lavfi > > v360=e:perspective:pitch=90:v_flip=1 -y out2.png > > > > Now I want to add a yaw rotation after the pitch rotation: > > > > ffmpeg -i equirectangular_test.png -lavfi > > v360=e:perspective:rorder=pyr:pitch=90:yaw=20:v_flip=1 -y out3.png > > > > But in the output you can see that a roll rotation was done. > > Today I did for the very first time figure out how to compile ffmpeg. > The above problem can be solved by changing two lines in vf_v360.c > Sorry, I haven't yet figured out how to use git.One thing after the > other... > > Old version: > line 3136: vec[1] = sin_theta; > line 3137: vec[2] = cos_theta * cos_phi; > > New version: > line 3136: vec[1] = cos_theta * cos_phi; > line 3137: vec[2] = sin_theta; > > I'm not sure if lines 3139 to 3141 must also be changed. > > Good job! Please write a patch with correct authorship and send it to the devel list. Fixing this for you was much more work than writing & sending patch will be. > Michael > > _______________________________________________ > ffmpeg-user mailing list > [email protected] > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > [email protected] with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list [email protected] https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
