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• Combining sampled videos from multiple sources using ffmpeg

  4 juin 2016, par Mrunal Gawade

  If I have two videos shooting the same subject but from different angles, and then I want to create a single video, but the combination is not just concatenation but a time lined sample linearly from each of the video to create the same time line output video. Is it possible ?

  For e.g. if both videos were shot for 1 minute each. then when I combine I want to combine 0-15 secs from 1st then 15-30 secs from second, then 30-45 from 1st, then 45-60 from second video. to create a 1 minute video.

  Also as a generic case if above is possible, the time sample need not be uniformly distributed but random from each videos, as long as the total clips add upto original shoot time.

  As a more generic case if above is possible, extending it to more than two video sources, lets say 3 videos combined in the above manner in a random time clips to create a single video.

  many thanks
  Mrunal

• Android - concatenate two videos

  4 décembre 2016, par Marc Plano-Lesay

  I’m trying to concatenate two videos on Android. I’m already using ffmpeg for other needs, but I’m using halfninja’s one, which is only 0.9. The 0.9 one doesn’t allow the following ways to do it :

  // filter_complex isn't recognized
  
  vk.run(new String[] {
  
          "ffmpeg",
  
          "-i",
  
          inputFile1,
  
          "-i",
  
          inputFile2,
  
          "-filter_complex",
  
          "'[0:1] [0:0] [1:1] [1:0] concat=n=2:v=1:a=1 [v] [a]'",
  
          "-map",
  
          "'[v]'",
  
          "-map",
  
          "'[a]'",
  
          outputFile
  
  });
  
  
  
  // Or, after converting the two videos to ts, trying to merge them: concat:file1.ts|file2.ts: No such file or directory
  
  vk.run(new String[] {
  
          "ffmpeg",
  
          "-i",
  
          "'concat:" + ts1 + "|" + ts2 + "'",
  
          "-vcodec",
  
          "copy",
  
          "-acodec",
  
          "copy",
  
          "-absf",
  
          "aac_adtstoasc",
  
          output
  
  });

  The third thing I tried is to use the concat demuxer explained here, which isn’t recognized with ffmpeg 0.9 either.

  Is there any way to concatenate two videos on Android with ffmpeg 0.9 (or another library) ?

• how can i stack videos which have different durations ?

  16 novembre 2018, par user2707690

  I made a ffmpeg filter graph using hstack to merge two videos. The two videos have different durations. One has 1:30 and the other has 8:48 length.

  I had expected the output video has 8:48, but the result was 2:14. Is this hstack filter spec ?

  And is there any other solution ?

  command line is here. (these webms have only video streams)

  ffmpeg -i vonly_short.webm -i vonly_long.webm -filter_complex "[0:v]scale=-1:270, pad=480:270:-1:-1[v0];[1:v]scale=-1:270, pad=480:270:-1:-1[v1]; [v0][v1]hstack=2:0[outv]" -map [outv] -c:v vp8 out.webm