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• How to stitch videos to one 360 video without 3rd party software ?

  6 janvier 2017, par Basset hound

  I am using a 3D software, something like GTA.
  I wanted to create a 360 video.
  What I did was create 84 videos automatically by C#.
  
  Set camera orientation to, (Step = 30 degree)
  

  1. (Rx, Ry, Rz) = (0.0, -90.0, 0.0)
  
  2. (Rx, Ry, Rz) = (0.0, -90.0, 30.0)
  
  3. (Rx, Ry, Rz) = (0.0, -90.0, 60.0)
  
  ...
  
  12. (Rx, Ry, Rz) = (0.0, -90.0, 330.0) 
  
  
  
  13. (Rx, Ry, Rz) = (0.0, -60.0, 0.0) 
  
  14. (Rx, Ry, Rz) = (0.0, -60.0, 30.0)
  
  15. (Rx, Ry, Rz) = (0.0, -60.0, 60.0) 
  
  ...
  
  83. (Rx, Ry, Rz) = (0.0, 90.0, 300.0) 
  
  84. (Rx, Ry, Rz) = (0.0, 90.0, 330.0) 

  After created 84 videos, I used Kolor Autopano Video to stitch the video.
  The result is good.
  
  However, I was wondering, each video has precise camera orientation.
  I think I don’t really need Kolor Autopano Video to create 360 video.
  Is it possible to stitch 84 videos by FFmpeg or C# ?
  Do you have any hint about this ?
  
  Thank you.

• Is there software that searches where in a video a particular image appears on screen ? [closed]

  11 février 2024, par DatGameh

  I have this two-hour long video that contains a number of hidden coupon codes scattered throughout it. It's for something that is quite expensive, and each code provides a pretty good discount.

  


  Problem is, these coupons appear for only a brief moment in the video and it's not predictable where they are placed on the screen and in what orientation.

  


  I did manage to snag one of the coupons, which I've isolated with a transparent background. So, knowing what a coupon looks like, I wonder : is there a software that takes a sample image and searches through the video where these coupons appear ?

  


  I've tried FFMPEG, but it seems like that app searches for the image in an exact position on the screen. Since I'm not familiar with video tools like this, so I'm not sure where to start.

  


  Thank you !

  


• Image mask blur processing problem using ffmpeg

  16 avril 2024, par andrew kim

  I want to apply blur using masking to two or more points in the image. I want to use a circular or other type of blur in ffmpeg rather than a box blur. I wrote the ffmpeg code, but an error continued. When there is only one blur, it works correctly, but when there are two or more blurs, an error occurs. No matter how much I search, I can't figure it out, so I'd like to ask for help.

  


  The ffmpeg code I wrote is as follows.

  


  ffmpeg -i input.mp4 -i mask.png -filter_complex "`
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1]; `
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2]; `
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1]; `
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v] `
"-map "[v]" -map 0:a -c:v libx264 -c:a copy -movflags +faststart maskedblur.mp4


  


  The error is as follows.

  


  [mov,mp4,m4a,3gp,3g2,mj2 @ 0000026ed1d4a500] Invalid stream specifier: temp1.
    Last message repeated 1 times
[fc#0 @ 0000026ed1cdc280] Stream specifier 'temp1' in filtergraph description
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/1:(oh-ih)/1[pmask1];
[1:v]scale=200:200,pad=1920:1080:(ow-iw)/3:(oh-ih)/3[pmask2];
[0:v][pmask1]alphamerge,avgblur=10[alf];[0:v][alf]overlay[temp1];
[temp1][pmask2]alphamerge,avgblur=10[alf2];[temp1][alf2]overlay[v]
 matches no streams.
Error initializing complex filters: Invalid argument