On 9/11/19, Michael Koch <astroelectro...@t-online.de> wrote: > Am 11.09.2019 um 14:23 schrieb Michael Koch: >> Am 11.09.2019 um 13:13 schrieb Michael Koch: >>> Paul, >>> >>>>> I think the field of view isn't correct in the stereographic output. >>>>> >>>>> Here is a script for making really nice test images, for measuring >>>>> field >>>>> of view: >>>> Well spotted, thanks, should be fixed. >>> >>> The field of view of the stereographic output isn't correct. Here are >>> a few examples: >>> set in command line / measured in output image >>> 60° / 74° >>> 120° / 135° >>> 180° / 180° >>> 240° / 212° >>> 300° / 236° >>> 360° / 274° >> >> Make this correction: >> >> new_fov = 180 * tan(fov/4) >> >> where fov the the field of view you get from the command line, and >> fov_new is the value that you use for the filter. >> You must exclude values too close to 360°, because 360° stereographic >> projection is impossible. >> > > P.S. of course fov must be converted to radians before using tan(): > > new_fov = 180 * tan(fov * pi / 720)
Thanks, that cleared some stuff. Should be fixed. > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".