Well, first of all, there is no profile yet for HERO 6. It looks like the 4 and 5 use the same lens, but applying that profile to your example frame over-corrects badly, either because the Hero 6 has a different lens, or because the video is already partially corrected (is that what "linear mode" does?)
I would just use the "lenscorrection" filter: https://ffmpeg.org/ffmpeg-filters.html#lenscorrection It lets you directly supply coefficients. Something like this looked close to correct on your frame: ffmpeg -i 0STHMkD.jpg -vf 'lenscorrection=k2=0.007:k1=-0.18' output.jpg You can play around with the values depending on how strictly rectilinear you want to get, keeping in mind that you lose (and "stretch") the corners of the image the more you correct a wide-angle view like that. You could also probably apply some downward pre-scaling before the lenscorrection filter to retain more edge content; I don't know the best way to do that in ffmpeg offhand, though. -- jys On Sat, Mar 16, 2019, at 12:17, Ariel Elkin wrote: > Hello, > > I’d like to use lensfun to do lens correction on footage from a GoPro HERO 6. > > Here’s a snapshot from the footage: > https://i.imgur.com/0STHMkD.jpg > > Even though the footage was shot in linear mode, you can still see as a > result of the fisheye lens distortion: the window frame on the left > appears curved. > > Given this sample syntax from the ffmpeg documentation: > ffmpeg -i input.mov -vf lensfun=make=Canon:model="Canon EOS > 100D":lens_model="Canon EF-S 18-55mm f/3.5-5.6 IS > STM":focal_length=18:aperture=8 -c:v h264 -b:v 8000k output.mov > > I’m not clear what values I should put for make, model, lens_model, > focal_length, and aperture. On lensfun lens list I see GoPro and > fixed_lens but how exactly should I use that with ffmpeg? > > Thanks >https://www.fastmail.com/mail/traffic.lensfun/?u=156841ae > Ariel _______________________________________________ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
