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• Video from VFR Image Sequence

  12 octobre 2014, par Stryker33

  I am using ffmpeg to create video from an image sequence that is taken from the Android Camera’s PreviewCallback method onPreviewFrame...

  The images are written to a pipe that is connected to ffmpeg’s stdin using the command :

  ffmpeg -f image2pipe -vcodec mjpeg -i - -f flv -vcodec libx264

  The problem that’s arising is that the output video is very short as compared to the actual recording time and all of the frames are shown very rapidly...

  But when the frame size is set to the lowest supported preview size, the video appears to be in sync with the actual recording time...

  As far as I reckon this seems to be an issue related to the frame rate of the input image sequence and that of the output video...

  But the main problem is that the frames that are generated from onPreviewFrame are of variable rates...

  Is there any way to construct a smooth video from an image sequence having variable frame rate...?

  Also, the image sequence is muxed with audio from the microphone which also appears to be out of sync with the video...

  Could the video generated using the above process and audio from the microphone be muxed in perfect synchronization...?

• ffmpeg with zoom, combine video & audio

  30 août 2021, par P Jewellery

  I have 4 input,

  


  

  1. Main video (No audio in the video)

  


  2. logo.png (always stay on top right corner)

  


  3. image.jpg (Locate at the end of video, Have different ratio with main video)

  


  4. audio.mp3 (The only audio input)

  


  


  The below code helped me to edit the main video.

  


  for %%a in ("*.mp4") do c:\ffmpeg.exe -i "%%a"  
-filter_complex " 
[0:v]trim=0.13:2.5, setpts=PTS-STARTPTS [v0]; 
[0:v]trim=0.13:2.5, reverse,setpts=PTS-STARTPTS[v1]; 
[0:v]trim=28.5:31, reverse,setpts=PTS-STARTPTS [v2]; 
[0:v]trim=28.5:31,setpts=PTS-STARTPTS [v3]; 
[0:v]tpad=stop_mode=clone:stop_duration=2, trim=0.13:31,setpts=0.5*PTS-STARTPTS [v4];
[0:v]trim=30.95:31,tpad=stop_mode=clone:stop_duration=5,setpts=PTS-STARTPTS [v5]; 
[v0][v1][v2][v3][v4][v5]concat=n=6:v=1:a=0[out]" -map "[out]" "%%~dpnaf.mp4"


  


  However, I want to

  


  


  1. add a logo at top right of the video throughout the whole video.

     


  


  2. add an image.jpg at the end of my edited main video.

     


  


  3. add the audio.mp3 throughout the whole final output video. (duration depends on the video.)

     


  


  4. apply a continuous zoom in for [v0]&[v1] (Since v1 is reverse of v0, after the zooming, ending image of v1 is bigger than starting image of v0, so v0,v1 looks like a smooth zoom in video)

     


  


  


  "scale=2160x2160,zoompan=z='min(max(zoom,pzoom)+0.01,5.0)':x='iw/2-(iw/zoom/2)':y='ih/2-(ih/zoom/2)':d=125:s=2160x2160",


  


  and a continuous zoom out for [v3] & [v4]

  


  All the about to be able to run through a single bat file.

  


• RTSP to file using IMediaTools errors

  4 décembre 2014, par predy23

  Im trying to save a streaming with RTSP to file with IMediaTools. If I use the local file path of the video in the IMediaReader, it goes nice without errors, but if i make a RTSP streaming of the video and I use the RTSP direction in the IMediaReader i have a lot of errors like this one :

  ERROR org.ffmpeg - [h264 error while decoding MB 50 44, bytestream (td)

  I can open the output file but it have a lot of blurry zones and its not smooth.

  This is my code :

      public static void main(String[] args)  {
  
      // TODO code application logic here
  
     //create a media reader
  
      System.out.println("starting video conversion..");
  
  
  
      // create a media reader
  
      IMediaReader reader = ToolFactory.makeReader(inputFilename);
  
      IMediaWriter writer = ToolFactory.makeWriter(outputFilename, reader);
  
  
  
      // add a debug listener to the writer to see media writer events
  
      writer.addListener(ToolFactory.makeDebugListener());
  
      reader.addListener(writer);
  
  
  
      // read and decode packets from the source file and
  
      // and dispatch decoded audio and video to the writer
  
      while (true) {
  
          if (reader.readPacket() != null) {
  
  
  
              break;
  
          }
  
      }
  
  
  
      reader.close();
  
      writer.close();
  
      System.out.println("video conversion finished..");
  
  }