SPAM On Sun, Jul 17, 2022 at 7:54 AM Michael Koch <[email protected]> wrote:
> Am 17.07.2022 um 12:09 schrieb Denis Połeć: > > > >> Am 16.07.2022 um 22:12 schrieb Michael Koch < > [email protected]>: > >> > >> Am 16.07.2022 um 20:57 schrieb Denis Połeć: > >>>> Am 16.07.2022 um 11:46 schrieb Paul B Mahol <[email protected]>: > >>>> > >>>> On Sat, Jul 16, 2022 at 11:22 AM Denis Połeć <[email protected]> > wrote: > >>>> > >>>>> Hello, > >>>>> I wouldn't call myself a beginner, but I still need a little bit to > become > >>>>> a pro. :) > >>>>> I have a question that might be easy to answer. > >>>>> > >>>>> I am working on a script to bring multiple flat videos into a > >>>>> equirectangular projection by using v360 filter. > >>>>> I have the problem that the edges of the input are very jagged. > >>>>> > >>>>> This did not lead to a good result when I play the equirectangular > >>>>> projection in a 360 player. I have also already tried different > >>>>> interpolation modes, which does not lead to a better result. > >>>>> Does anyone have an idea how I can avoid that? Is there a better way > to do > >>>>> this task? > >>>>> > >>>>> > >>>>> Here is an example code with the result. The video in the example > has a > >>>>> resolution of 1080p: > >>>>> > >>>>> > >>>>> ffmpeg -i BRAIN.mp4 -lavfi "\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw='0':alpha_mask=1[fg1];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=90:alpha_mask=1[fg2];[fg2][fg1]overlay[a];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=-90:alpha_mask=1[fg3];[fg3][a]overlay[b];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=180:alpha_mask=1[fg4];[fg4][b]overlay[c];\ > >>>>> \ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=0:pitch=45:alpha_mask=1[fg5];[fg5][c]overlay[d];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=90:roll=45:alpha_mask=1[fg6];[fg6][d]overlay[e];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=-90:roll=-45:alpha_mask=1[fg7];[fg7][e]overlay[f];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=180:pitch=-45:alpha_mask=1[fg8];[fg8][f]overlay[g];\ > >>>>> \ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=0:pitch=-45:alpha_mask=1[fg9];[fg9][g]overlay[h];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=90:roll=-45:alpha_mask=1[fg10];[fg10][h]overlay[i];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=-90:roll=45:alpha_mask=1[fg11];[fg11][i]overlay[j];\ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=180:pitch=45:alpha_mask=1[fg12];[fg12][j]overlay[k];\ > >>>>> \ > >>>>> > >>>>> > [0]v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=0:pitch=90:alpha_mask=1[fg13];[fg13][k]overlay[l];\ > >>>>> > [0]drawbox=w=1:h=1:color=black,v360=input=flat:output=e:id_fov=45:w=5120:h=2560:yaw=0:pitch=-90:alpha_mask=1[fg14];[fg14][l]overlay" > >>>>> -q:v 4 -vframes 1 -y test11.jpg > >>>>> > >>>>> Your filtergraph is extremely inefficient with that many cascaded > overlays > >>>> and gives poor results. For proper stitching borders need to have > small > >>>> transition from full opacity to no opacity. > >>>> > >>>> To add small transitions with opacity on borders could use blurring > filters > >>>> for example on alpha plane only. > >>> How could I achieve that? How can I blurry just the borders? > >> You could apply some preprocessing to your input video, before you feed > it to your script. > >> The trick is to multiply all pixels at the edges by 0.5. This can be > done with a white mask which has gray pixels at the edge. > >> > > Thank you for your reply. > > > >> ffmpeg -f lavfi -i color=color=white:size=1920x1080 -lavfi > drawbox=color=gray:t=1 -frames 1 -y mask.png > > This works. > > > >> ffmpeg -f lavfi -i testsrc2=size=1920x1080 -i mask.png -lavfi > multiply=offset=0 -frames 1 -y test.png > > But ffmpeg says multiply filter doesn’t exist. > > Get a newer version. The multiply filter was added not so long ago. > > 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".
