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• avfilter/vf_v360 : add cylindrical equal area format

  30 juin 2021, par Paul B Mahol

  avfilter/vf_v360 : add cylindrical equal area format
  

  • [DH] doc/filters.texi
  • [DH] libavfilter/v360.h
  • [DH] libavfilter/vf_v360.c

• Why Ffmpeg boxblur working slowly with non square area ?

  29 mai 2021, par Dmitri Dmitriev

  I've got a problem with ffmpeg boxblur if I want to blur ellipse area. No problem if you have 1 or 5 intervals for blurring, but if you have 90min movie and 150 intervals, it may be working > 6 hours. No problem with square blurring even if you have > 150 intervals, but I use ellipse. How do I do it ?

  


  Truncated command (original too long) :

  


  


  ffmpeg -y -i /data/www/records/streams/ftp/1100921_test.mp4 -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_1.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_2.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_3.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_4.png -loop 1 -i /tmp/tmpmajq7xhk/mask_for_1100921_test_5.png ..... -filter_complex "[0]crop=353:373:685:58, boxblur=20:enable='between(t,189.441341,189.781339)'[1] ;[0][1]overlay=685:58:enable='between(t,189.441341,189.781339)'[2] ;[0]crop=353:373:674:93, boxblur=20:enable='between(t,189.781339,189.901336)'[3] ;[2][3]overlay=674:93:enable='between(t,189.781339,189.901336)'[4] ;[0]crop=353:373:671:125, boxblur=20:enable='between(t,189.901336,190.001332)'[5] ;[4][5]overlay=671:125:enable='between(t,189.901336,190.001332)'[6] ;[0]crop=353:373:671:154, boxblur=20:enable='between(t,190.001332,190.09133)'[7] ;[6][7]overlay=671:154:enable='between(t,190.001332,190.09133)'[8] ;[0]crop=353:373:656:183, boxblur=20:enable='between(t,190.09133,190.151327)'[9] ;[8][9]overlay=656:183:enable='between(t,190.09133,190.151327)'[10] ;[0]crop=353:373:668:213 ..... -map 0:a -c:v h264_nvenc -c:a copy -movflags +faststart /data/www/records/streams/ftp/1100921_test.mp4_out.mp4

  


  


• How create a circular video (transparent area on top of video) effect without applying image mask to video

  26 septembre 2024, par Arina Lubimova

  Basically i googled a lot and solutions suggests apply some PNG mask or do not provide needed solution.

  


  What i've found.

  


  ffmpeg -i main.mkv -i facecloseup.mkv
 -filter_complex "[1]trim=end_frame=1,
  geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':128:128,
  loop=-1:1,setpts=N/FRAME_RATE/TB[mask];
  [1][mask]alphamerge[cutout];
  [0][cutout]overlay=x=W-w:y=0[v];
  [0][1]amix=2[a]"
 -map "[v]" -map "[a]"  out.mp4


  


  command = "-i " + this.video1Path.getPath() + " -i " + this.video2Path.getPath() + " -filter_complex [1]trim=end_frame=1,geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3)," + (this.mZoomLayout.getZoomedWidth()/2) + "*" + (this.mZoomLayout.getZoomedWidth()/2) + "),255,0)':128:128,format=gray,loop=-1:1,setpts=N/FRAME_RATE/TB[mask];[1][mask]alphamerge,format=rgba,lutrgb=a=if(gte(val\\,16)\\,val)[cutout];[0][cutout]overlay=" + this.mZoomLayout.getCircleX() + ":" + this.mZoomLayout.getCircleY() + ":enable='between(t,0," + this.videoTwoDuration + ") -c:v libx264 -crf 24 -preset ultrafast " + videoPath.getPath(); 


  


  So i tried to extract needed things from them, but i don't understand how exactly i need to do that, i did this :

  


  ffmpeg -i video.mp4 -filter_complex "[0]geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge" out.mp4


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001f761dd8e40] Invalid stream specifier: mask.
    Last message repeated 1 times
Stream specifier 'mask' in filtergraph description [0]geq='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge matches no streams.


  


  ffmpeg -i video.mp4 -filter_complex "[0]geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge" out.mp4


  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 000001bfd9218e80] Invalid stream specifier: mask.
    Last message repeated 1 times
Stream specifier 'mask' in filtergraph description [0]geq=lum_expr='st(3,pow(X-(W/2),2)+pow(Y-(H/2),2));if(lte(ld(3),pow(min(W/2,H/2),2)),255,0)':H:W; [0:v][mask]alphamerge matches no streams.


  


  And one more time, guys, if you are going to post some "prepared image mask" solution - just leave, the question is about creating mask on air.

  


  So, let's say we have red square (yes, ratio is static, always 1:1), yes, i can't post it because i dont have 10 rep. (...).

  


  https://i.sstatic.net/MsL71.png - red square.

  


  https://i.sstatic.net/aIFEV.png - circle

  


  https://i.sstatic.net/R8EAx.png - result

  


  https://i.sstatic.net/WtqQg.png - final result

  


  I actually want to get the answer from @Gyan or @llogan because i searched a lot and only these two guys do understand how to make things programmatically.

  


  More tech details :
Aspect ratio is constant - 1:1, width and height should be taken from the video in auto way, we need to create a white square with transparent circle inside it, the end result must contain "rounded" video with white background.