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• Aforge.NET Video Size Decreases When Writing Back Frames to the Video

  23 août 2016, par Irfan Babar

               try { VideoFileReader reader = new VideoFileReader();
  
                 VideoFileWriter wrt = new VideoFileWriter();
  
                 tot = reader.FrameCount;
  
                  wrt.Open("outvid.mp4",reader.Width,reader.Height,reader.FrameRate,VideoCodec.MPEG4);
  
                  Bitmap videoFrame = null;
  
  
  
                  for (int i = 1; i <= tot; i++)
  
                  {
  
                       videoFrame = reader.ReadVideoFrame();
  
  
  
                       wrt.WriteVideoFrame(videoFrame );
  
                       videoFrame .Dispose();
  
                  }
  
                  wrt.Close();
  
                  reader.Close();
  
  
  
  
  
              }
  
          }
  
          catch (Exception exc)
  
          {
  
              MessageBox.Show( exc.ToString());
  
          }

  after writing back the video size and resolution also decrease, what shoud i do to make perfect frame writing back into the video ?
  Actually I am reading frame by frame from one video and writing that video frame in another video without any modification,Please suggest me solutions

• movenc : take packet dts shifting into mention in check_pkt

  30 septembre 2017, par Jan Ekström

  movenc : take packet dts shifting into mention in check_pkt
  This FFmpeg-specific "fuzzer fix" was never perfect, but now it
  
  stopped encoding of actual content with a big enough DTS shift.
  
  This returns the function to its original state of results
  
  before negative CTS offsets were added.
  I remember dealing with this function before, but somehow had
  
  forgotten about it during VDD. The test cases not tripping this
  
  over also didn't help.
  

  • [DH] libavformat/movenc.c

• Is there a way to include a transition video when using ffmpeg's select filter ?

  19 février 2021, par Tim

  I wanted to take some segments of an input video and make a highlight reel automatically using ffmpeg. I was originally experimenting with trimming and concating but it was difficult because the audio was falling out of sync and also I have a variable number of highlights that I want.

  


  I discovered from the top comment here that the 'select' filter is very powerful. I have a python program that inputs all the parts I want selected into the command and run it in the terminal and it works perfect. Only issue is that I want a quick transition video to play in between each of these highlights. Is this not possible with select ? Do I have to return to using trim and concat ? Thank you !

  


  Edit : for reference, here is an example ffmpeg command I am running

  


  ffmpeg -y -i video.mp4 -i audio.mp4 -vf "select='between(t,56,69)+between(t,60,135)+between(t,73,132)+between(t,152,163)+between(t,251,278)+between(t,600,700)+between(t,774,872)', setpts=N/FRAME_RATE/TB " -af "aselect='between(t,56,69)+between(t,60,135)+between(t,73,132)+between(t,152,163)+between(t,251,278)+between(t,600,700)+between(t,774,872)',asetpts=N/SR/TB" output.mp4