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• FFMPEG : how to overlay a moving PNG with multiply blend effect (overlay filter + blend filter) [closed]

  22 avril 2024, par user24565885

  I tried hunting for all existing questions and couldn't find a match :-(

  


  I have a video and a PNG image that I overlay on top of that. The PNG needs to move across the video (this I have working). But I want the PNG to use a "multiply" blend effect vs. a standard alpha overlay. Whenever I try to apply both filters I get an error.

  


  This code works and moves the image (the last one) across as expected :

  


  ffmpeg -i d6b5ec90-8823-41cf-9b81-3086ce83054a.mp4   -loop 1 -i 593e677d-02bb-49c2-a0c6-c3dd8f8c2f72.png  -loop 1 -i 32fea58f-ebe1-447e-b079-06f8ebb9df52.png  -loop 1 -i cb7435fb-5aff-4eeb-af2a-22b92c900db6.png -filter_complex "[0]fps=30,scale=3840:3840[o1];[1]fps=30,setpts=PTS+0.000/TB[t_1];[o1][t_1]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,0.000,5.000)':shortest=1[o2];[2]fps=30,setpts=PTS+1.000/TB[t_2];[o2][t_2]overlay=(main_w-overlay_w)/2:(main_h-overlay_h)/2:enable='between(t,1.000,5.000)':shortest=1[o3];[3]fps=30[t_3];[o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1" -r 30 -pix_fmt yuv420p -c:a aac -b:a 128k -c:v libx264 -b:v 8000k out.mp4


  


  I now want that last effect to use multiply for blending and that's what I can't figure out. Applying both filters with a comma seems reasonable but bonks (NOTE : the MP4 and all PNGs are 3840x3840 so it's not a size issue)

  


  [o3][t_3]overlay='main_w*(1.5+(0-1.5)*max(0,1-(n-1.000*30)/(4.5*30)))':0:enable='between(t,1.000,4.500)':shortest=1,blend=all_mode='multiply':all_opacity=1


  


  The error I get is "Cannot find a matching stream for unlabeled input pad 1 on filter Parsed_blend_10".

  


  I've looked at this one : In FFmpeg, using -filter_complex, how can I overlay and blend at the same time ? but can't quite figure out how I would split, blend, then overlay in my situation where the last input PNG ([3]) needs to blend and move...

  


  Would really appreciate the help if anyone has a solution.

  


  THANKS !

  


• Revision 07436abb86 : Use zero motion vector in choose_partitioning The zero motion vector was effect

  27 octobre 2014, par Jingning Han

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Use zero motion vector in choose_partitioning

  The zero motion vector was effectively used in the subsampled pixel
  based variance calculation. This commit makes it directly use zero
  mv to generate prediction.

  Change-Id : Ica83dc843e9f8da2f89c3ef451e50f16214c0def

• avfilter/vf_psnr : Prevent integer overflow.

  21 septembre 2013, par Neil Birkbeck

  avfilter/vf_psnr : Prevent integer overflow.
  The 32-bit integer accumulator in MSE computation can overflow for 8-bit frame data.
  
  (e.g., for 1080p white frame compared to a black frame can give sum of 255*255*1080*1920 > 2^32).
  Signed-off-by : Neil Birkbeck <neil.birkbeck@gmail.com>
  
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] libavfilter/vf_psnr.c