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• 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..

• 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 ?

• ffmpeg is looping / hanging up

  18 mars 2017, par Zara Rebecka Elisabeth Zentio

  I have a video that i created from 3 other videos (merged them with FFMPEG).
  Video Plays fine, but when i try to also add an watermark overlay on the video file i created it start to loop. And if i force it to close the output will be of one movie only.

  I have 3 video files they have diffrent ScreenResulutions.
  I merg those 3 video files in FFMPEG with this command via commandline

  ffmpeg -i  "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts" -c copy -bsf:a aac_adtstoasc myoutputfile.mp4

  The out put works fine all 3 movies are merged, and i can play it like normal.

  Now i try to ad a water mark to this new created video file.

  ffmpeg -i mainmovie.ts -i mywatermark.png -filter_complex "overlay=10:10:enable='lt(mod((t\\),20),7)'" WatermarkedVideoFile.mp4

  The issue here is that it starts to loop seems like it hangs on the first 6 secounds and this seems to be the video that was in intermediate1.ts so i think the issue is that the 3 files i merged to one video file may have diffrent Resulutions and this is why the overlay script dont work proper.

  So my question is can i re-encode it somehow and force it so it will have same resulution while keeping aspect ratio ?