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• How to combine multiple images horizontally and vertically using ffmpeg [duplicate]

  7 février 2020, par user3625087

  I’m attempting to create a script that can stitch together images side by side. These images are basically letters that I want to create words with (think of those ransom letters in Hollywood movies with randomly cut out letters from magazines). I need to specifically use these images, so I don’t want ffmpeg to type out some words into images itself. I’ve seen some similar answers using hstack and tile filter complexes but those didn’t work for me. Here is what I’ve tried so far :

  ffmpeg -pattern_type glob -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex tile=5x1 test.png

  For this one, -pattern_type didn’t exist as an option (I’m using ffmpeg 4.2 on Windows), so I removed it and the result was 1 letter and black space for the rest.

  ffmpeg -y -i h.png -i e.png -i l.png -i l.png -i o.png -filter_complex hstack test.png

  For this one, the result was 2 letters side by side, and then black space for the rest.

  All of my images are of the same height and variable width. Is there a command that can achieve this ?

• Using ffmpeg to extract images

  21 septembre 2014, par Yalamanchili Hari

  I am new to use ffmpeg.I am trying to extract images from video at particular possession but failing. could any one help me in solving this problem.
  it is compiling with out any exceptions. Insted of video = "web url" if i am using video = "D :\movies\The Wow.mp4" ;it is giving frame.jpeg which is blank.insted of frame i need.
  my c# code is :

  protected void Button1_Click(object sender, EventArgs e)
  
  {
  
      // preview frame
  
      Process ffmpeg; // creating process
  
      string video;
  
      string thumb;
  
      //video = Page.MapPath("first.3gp"); // setting video input name with path
  
      video = "http://www.w3schools.com/html/mov_bbb.mp4/";
  
      thumb = "C:\\Users\\Public\\Videos\\Sample Videos\\" + "\\frame.jpg"; // thumb name with path !
  
      ffmpeg = new Process();
  
  
  
      ffmpeg.StartInfo.Arguments = " -i \"" + video + "\" -s 480*360  -vframes 1 -f image2 -vcodec mjpeg \"" + thumb + "\""; // arguments !
  
      ffmpeg.StartInfo.FileName = "C:\\ffmpeg\\bin\\ffmpeg.exe";
  
      ffmpeg.Start(); // start !
  
  }

  I cant find any frame.jpg file in output path..

• ffmpeg transparent HVEC video from alpha matte and color video

  16 janvier 2023, par James

  I have an alpha.mp4 (alpha matte video) and a color.mp4 (color video). How do I use ffmpeg to make a transparent HVEC (.mov) video ?

  


  I can combine with ffmpeg to make a .webm file following the instruction here :
https://www.unscreen.com/api under "Convert unpacked Pro Bundle to WEBM video with transparency"

  


  I have a newer mac and should be able to use HVEC_videotoolbox from either these 2 videos or the .webm file created.

  


  The closest I found was this which seems to generate a corrupt video that cannot be viewed in safari. Use FFmpeg to generate a movie with alpha channel from separate video and fill movies ? but