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• How do I add a text for the 1st 30 seconds inside a filter_complex expression for each video part ?

  30 décembre 2022, par PirateApp

  I am generating a video grid using the following filter_complex command

  


  ffmpeg
     -i v_nimble_guardian.mkv -i macko_nimble_guardian.mkv -i ghost_nimble_guardian_1.mp4 -i nano_nimble_guardian.mkv
     -filter_complex "
         nullsrc=size=3840x2160 [base];
         [0:v] trim=start=39.117000,setpts=PTS-STARTPTS, scale=1920x1080 [upperleft];
         [1:v] trim=start=40.483000,setpts=PTS-STARTPTS, scale=1920x1080 [upperright];
         [2:v] trim=start=32.416471,setpts=PTS-STARTPTS, scale=1920x1080 [lowerleft];
         [3:v] trim=start=28.100000,setpts=PTS-STARTPTS, scale=1920x1080 [lowerright];
         [3:a] atrim=start=28.100000,asetpts=PTS-STARTPTS[outa];
         [base][upperleft] overlay=shortest=1 [tmp1];
         [tmp1][upperright] overlay=shortest=1:x=1920 [tmp2];
         [tmp2][lowerleft] overlay=shortest=1:y=1080 [tmp3];
         [tmp3][lowerright] overlay=shortest=1:x=1920:y=1080[v]
     "
     -map "[v]" -map "[outa]" -c:v libx264 -crf 17 -shortest -t 880 output4k.mkv


  


  How do I text to this video grid that will appear with a fade in at 10 seconds, stay for 30 seconds and then fade out ?

  


  

  


  What I tried ?

  


  ffmpeg
     -i v.mkv -i macko_nimble_guardian.mkv -i ghost_nimble_guardian_subtle_arrow_1.mp4 -i nano_nimble_guardian.mkv
     -filter_complex "
         nullsrc=size=1920x1080 [base];
         drawtext=text='Summer Video':enable='between(t,10,30)'[fg];
         [0:v] trim=start=39.117000,setpts=PTS-STARTPTS, scale=960x540 [upperleft];
         [1:v] trim=start=40.483000,setpts=PTS-STARTPTS, scale=960x540 [upperright];
         [2:v] trim=start=32.416471,setpts=PTS-STARTPTS, scale=960x540 [lowerleft];
         [3:v] trim=start=28.100000,setpts=PTS-STARTPTS, scale=960x540 [lowerright];
         [3:a] atrim=start=28.100000,asetpts=PTS-STARTPTS[outa];
         [base][upperleft] overlay=shortest=1 [tmp1];
         [tmp1][upperright] overlay=shortest=1:x=960 [tmp2];
         [tmp2][lowerleft] overlay=shortest=1:y=540 [tmp3];
         [tmp3][lowerright] overlay=shortest=1:x=960:y=540[v]
     "
     -map "[v]" -map "[outa]" -c:v libx264 -shortest -t '30' output2.mkv


  


  It gives me an error

  


  [Parsed_drawtext_1 @ 0x600002bdc420] Using "/System/Library/Fonts/Supplemental/Verdana.ttf"
Filter drawtext:default has an unconnected output


  


• lavf : Replace the ASF demuxer

  15 juin 2015, par Alexandra Hájková

  lavf : Replace the ASF demuxer
  The old one is the result of the reverse engineering and guesswork.
  
  The new one has been written following the now-available specification.
  This work is part of Outreach Program for Women Summer 2014 activities
  
  for the Libav project.
  The fate references had to be changed because the old demuxer truncates
  
  the last frame in some cases, the new one handles it properly.
  
  The seek-test reference is changed because seeking works differently
  
  in the new demuxer. When seeking, the packet is not read from the stream
  
  directly, but it is rather constructed by the demuxer. That is why
  
  position is -1 now in the reference.
  Signed-off-by : Anton Khirnov <anton@khirnov.net>
  

  • [DBH] Changelog
  • [DBH] libavformat/asf.h
  • [DBH] libavformat/asfdec.c
  • [DBH] libavformat/asfenc.c
  • [DBH] libavformat/version.h
  • [DBH] tests/ref/fate/wmv8-drm-nodec
  • [DBH] tests/ref/seek/lavf-asf

• Picturebox from AForge FFMPEG empty - C#/WinForms

  1er août 2017, par Jake Delson

  I’ve done a ton of research and looked at a lot of questions here but can’t seem to find anything to help me. I should preface I’m very new to C#, Windows Forms, and SO ! I’m a 1st year CompSci student coming from C++ experimenting with my own projects for the summer. I’m trying to display a series of bitmaps from a .avi using the AForge.Video.FFMPEG video file reader.

  It seems to be finding the file, getting its’ data (console prints dimensions, framerate, and codec) and creating the picturebox, but the picturebox comes up blank/empty. I get the bitmap from the frames of a .avi :

  From AForge example code here

  Then I’m trying to display it with a picture box :

  From MS example code here as well

  And here’s my code. Essentially a combination of the two :

      public class Simple : Form
  
  {
  
      Bitmap videoFrame;
  
  
  
      public Simple()
  
      {
  
          try
  
          {
  
              // create instance of video reader
  
              VideoFileReader reader = new VideoFileReader();
  
              // open video file
  
              reader.Open(@"C:\Users\User\Desktop\ScanTest3.AVI");
  
              // check some of its attributes
  
              Console.WriteLine("width:  " + reader.Width);
  
              Console.WriteLine("height: " + reader.Height);
  
              Console.WriteLine("fps:    " + reader.FrameRate);
  
              Console.WriteLine("codec:  " + reader.CodecName);
  
  
  
              PictureBox pictureBox1 = new PictureBox();
  
  
  
              // read 100 video frames out of it
  
              for (int i = 0; i < 100; i++)
  
              {
  
                  videoFrame = reader.ReadVideoFrame();
  
  
  
                  pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
  
                  pictureBox1.ClientSize = new Size(videoFrame.Width, videoFrame.Height);
  
                  pictureBox1.Image = videoFrame;
  
  
  
                  // dispose the frame when it is no longer required
  
                  videoFrame.Dispose();
  
              }
  
  
  
              reader.Close();
  
          }
  
  
  
          catch
  
          {
  
              Console.WriteLine("Nope");
  
          }
  
  
  
      }
  
  }
  
  
  
  class MApplication
  
  {
  
      public static void Main()
  
      {
  
          Application.Run(new Simple());
  
      }
  
  }

  So that’s it pretty much. Just a blank picture box coming up, when it should have the first frame of the video, even though no exception caught (though I’m pretty confident I’m using the try/catch very poorly), and the console printing the correct data for the file :

  width:  720
  
  height: 480
  
  fps:    29
  
  codec:  dvvideo
  
  [swscaler @ 05E10060] Warning: data is not aligned! This can lead to a speedloss

  Though if anyone could tell me what that warning means, that would be great as well, but I’m mainly just lost as to why there’s no picture printing to the screen.

  Thanks !