> Am 16.07.2022 um 22:12 schrieb Michael Koch <astroelectro...@t-online.de>: > > Am 16.07.2022 um 20:57 schrieb Denis Połeć: >> >>> Am 16.07.2022 um 11:46 schrieb Paul B Mahol <one...@gmail.com>: >>> >>> On Sat, Jul 16, 2022 at 11:22 AM Denis Połeć <denis.po...@gmail.com> 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. I tried that: ffmpeg -f lavfi -i testsrc2=size=1920x1080 -i mask.png -lavfi blend=all_mode=multiply -frames 1 -y test.png output gets green. ffmpeg -f lavfi -i testsrc=size=1920x1080 -i mask.png -lavfi blend=all_mode=multiply -frames 1 -y test.png Works! If I take a video, the video output gets green. > > Then use test.png as input for your script. > > Michael > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org <mailto:ffmpeg-user@ffmpeg.org> > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > <https://ffmpeg.org/mailman/listinfo/ffmpeg-user> > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org <mailto: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".