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• FFMPEG zoompan filter cut short my video and slowed it down [on hold]

  9 décembre 2018, par Ewan Sou

  I am using FFMPEG (version 4.0.2) to zoompan my video. My code is as below

  ffmpeg -y -i input.mp4 -loop 1 -i overlay.png -ss 0 -t 10 -filter_complex "[0:v]scale=iw+iw:ih+ih, zoompan=z='if(lte(pzoom,1.0),1.6,max(1.001,pzoom-0.004))':d=1:x='iw/2-(iw/zoom/2)':y='0':s=720x720, setsar=1 [v0];[1:v]crop=720:720,fade=t=in:st=0:d=1,fade=t=out:st=3:d=1[v1];[v0][v1] overlay [v]" -map "[v]" -f mp4 -preset ultrafast -y output.mp4

  Essentially, what this code should do is slowly pan out from the center of my video, with a logo (overlay.png) fading in and out.

  This input.mp4 is 10 seconds. With the above code, the final video duration is 10 seconds still. But its not the full footage, it is cut short and compensated with slow motion to make it 10 seconds still...

  I need the final video to not be cut off at all. It should be the full footage and no slow motion effect.

  Anyone has any ideas what I am doing wrong ?

  Input video is at : https://instantly.sg/photobooth/input.mp4

  Overlay is at : here

  Thanks in advance !

• FFMPEG - Overlaying video with transparency, alpha has strange threshold

  3 novembre 2016, par tanker_

  I’m attempting to overlay an Apple ProRes 4444 video with a alpha/transparency onto a normal video. However, upon inspecting the final output from FFMPEG, compared to the same files overlaid on top of one another and rendered in Final Cut Pro, there is a discrepancy in how they render the edges around the object.

  Screenshot comparison.

  Additional closeup.

  Here is my input :

  ffmpeg \
  
      -i background.MOV -x264opts colormatrix=bt709 \
  
      -i alpha_object.MOV -x264opts colormatrix=bt709 \
  
      -filter_complex " \
  
          [0:v]setpts=PTS-STARTPTS, scale=1920x1080[top]; \
  
          [1:v]setpts=PTS-STARTPTS, scale=1920x1080, \
  
               colorchannelmixer=aa=1.0[bottom]; \
  
          [top][bottom]overlay=shortest=1" \
  
      -vcodec libx264 -qp 15 -an -shortest output.MOV

  Any idea what could be wrong ? Is there a option within FFMPEG’s available filters that I’m missing ?

  All files are ingested and rendered in 1920x1080.

• FFMPEG - Overlaying video with transparency, alpha has strange threshold

  6 mars 2019, par tanker_

  I’m attempting to overlay an Apple ProRes 4444 video with a alpha/transparency onto a normal video. However, upon inspecting the final output from FFMPEG, compared to the same files overlaid on top of one another and rendered in Final Cut Pro, there is a discrepancy in how they render the edges around the object.

  Screenshot comparison :

  

  Additional closeup :

  

  Here is my input :

  ffmpeg \
  
      -i background.MOV -x264opts colormatrix=bt709 \
  
      -i alpha_object.MOV -x264opts colormatrix=bt709 \
  
      -filter_complex " \
  
          [0:v]setpts=PTS-STARTPTS, scale=1920x1080[top]; \
  
          [1:v]setpts=PTS-STARTPTS, scale=1920x1080, \
  
               colorchannelmixer=aa=1.0[bottom]; \
  
          [top][bottom]overlay=shortest=1" \
  
      -vcodec libx264 -qp 15 -an -shortest output.MOV

  Any idea what could be wrong ? Is there a option within FFMPEG’s available filters that I’m missing ?

  All files are ingested and rendered in 1920x1080.