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• How use FFMPEG to merege multiple audios and videos with delay and offset for any streams

  9 juillet 2020, par Morak

  I want to use FFMPEG to merge multiple audios and videos.

  


  Materials are :

  


  

  1. three short audio clips (S1.mp4, S2.mp4, S3.mp4) without video(files
only have audio stream),

  


  2. three video clips (V1.mp4, V2.mp4, V3.mp4) without sound(files only have video stream).

  


  


  I have start-time of all materials(i.e :

  


  start-time of "S1.mp4" is 0 sec...
start-time of "S2.mp4" is 1220.5 sec...
start-time of "S3.mp4" is 2500.12 sec...


  


  and

  


  start-time of "V1.mp4" is 15.22 sec...
start-time of "V2.mp4" is 853.99 sec...
start-time of "V3.mp4" is 2901.37 sec...)


  


  My goal is :

  


  Merge all videos and audios to single file with entering in their start time.

  


  The requirement is depicted like below(D=delay).

  


  D <—V1.mp4—> D <----------V2.mp4-------------> D <-V3.mp4->blank

  &#xA;

  <------------S1.mp4-----> D <-------S2.mp4—> D <-------S3.mp4------->

  &#xA;

  The command I use is as below, but it does not work as expected.

  &#xA;

  1st:prepare V.mp4(merging all videos) :

  &#xA;

  ffmpeg -itsoffset {OFFSET.V1} -i V1.mp4  -itsoffset {OFFSET.V2} -i V2.mp4  -itsoffset {OFFSET.V3} -i V3.mp4 -map 0:v -map 1:v -map 2:v -c:v copy V.mp4

  &#xA;

  2nd:prepare S.mp4(merging all audios) :

  &#xA;

  ffmpeg -i S1.mp4 -i S2.mp4 -i S3.mp4 -filter_complex "[0]adelay=0[aud1];[1]adelay=1220.5[aud2];[2]adelay=2500.12[aud3];[aud1][aud2][aud3]amix=3[a]" -map "[a]" -c:a copy S.mp4

  &#xA;

  final:merging V.mp4 with S.mp4 :

  &#xA;

  ffmpeg -i V.mp4 -i S.mp4 -map 0:v -map 1:a -vcodec copy -acodec copy final.mp4

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  Any hint is appreciated !

  &#xA;

• Cannot include ffmpeg.exe using auto-py-to-exe

  4 avril 2024, par YYY

  I'm trying to generate an exe for my PyQT application that uses ffmpeg using auto-py-to-exe.

  &#xA;

  Within the application, there are calls to ffmpeg as an os command (like 'ffmpeg -i file ... output) .&#xA;As I have ffmpeg installed on my machine and accessible from the Windows Path, when I run the app exe on my machine, I don't have any issue.

  &#xA;

  However, when it's someone that doesn't have ffmpeg installed, he/she encounters an error like "'ffmpeg' is not recognized as an internal or external command, operal program or batch file"

  &#xA;

  I don't want to put ffmpeg within a folder of the app as I call local modules that already call ffmpeg as an os command.

  &#xA;

  I have tried first to add ffmpeg.exe as a file (as recommended in one stackoverflow post) and then as a binary but without success&#xA;

  &#xA;

  I've already tried with the configuration stated in this

  &#xA;

  Can anyone help me on this ?

  &#xA;

  EDIT N°2

  &#xA;

  It turns out that when I export the exe on my machine by including ffmpeg as a binary either with pyinstaller or auto-py-to-exe, the final exe doesn't recognize the ffmpeg command even if it's in the folder.

  &#xA;

  

  &#xA;

  However, I've tried the same configuration on another machine and it worked without any error.

  &#xA;

  I've tried to install another ffmpeg version and link this version on the final exe but without success

  &#xA;

• Using JavaCV/FFMPEG to push byte buffer image via RTMP

  6 mai 2022, par ljnoah

  I have a USB camera that returns frames as a byte buffer type to which I would like to push/send via rtmp using JavaCV library to be viewed using VLC. According to this link : http://bytedeco.org/javacpp-presets/ffmpeg/apidocs/org/bytedeco/ffmpeg/ffmpeg.html. It should be possible, but I don't really have any experience with ffmpeg, but from what I've read in their github it should be possible, only, thus far I was not able to find an example on how to do it. Basically, I would like to store a byte buffer and send an image that is in variable instead of grabbing frames from a camera as my USB camera is not detected by android and needs external libraries to work.

  &#xA;

  private byte[] FrameData = new byte[384 * 288 * 4];
  //private final Bitmap bitmap = Bitmap.createBitmap(PREVIEW_WIDTH, PREVIEW_HEIGHT, // Bitmap.Config.ARGB_8888); // creates a bitmap with the proper format in-case its needed
  private final IFrameCallback mIFrameCallback = new IFrameCallback() {
      @Override
      public void onFrame(final ByteBuffer frameData) {
          frameData.clear();
          frameData.get(FrameData, 0, frameData.capacity());
          }
  };


  &#xA;

  This callback gives me the frames from my camera on the fly and writes it to FrameData, which I can compress to a bitmap if needed.

  &#xA;

  My camera preview where I call the callback above :

  &#xA;

    public void handleStartPreview(Object surface) {
      if ((mUVCCamera == null)) return;
      try {
          mUVCCamera.setPreviewSize(mWidth, mHeight, 1, 26, UVCCamera.DEFAULT_PREVIEW_MODE, UVCCamera.DEFAULT_BANDWIDTH, 0);
      } catch (IllegalArgumentException e) {
          try {
              mUVCCamera.setPreviewSize(mWidth, mHeight, 1, 26, UVCCamera.DEFAULT_PREVIEW_MODE, UVCCamera.DEFAULT_BANDWIDTH, 0);
              Log.e(TAG, "handleStartPreview4");
          } catch (IllegalArgumentException e1) {
              callOnError(e1);
              return;
          }
      }
      int result = mUVCCamera.startPreview();
      mUVCCamera.setFrameCallback(mIFrameCallback, UVCCamera.PIXEL_FORMAT_RGBX);
      mUVCCamera.startCapture();
      startRecording();
  }


  &#xA;

  My question is How can I use this example :

  &#xA;

   String ffmpeg = Loader.load(org.bytedeco.ffmpeg.ffmpeg.class);
 ProcessBuilder pb = new ProcessBuilder(ffmpeg, "-i", "/path/to/input.mp4", "-vcodec", "h264", "/path/to/output.mp4");
 pb.inheritIO().start().waitFor();


  &#xA;

  to push my frames from the camera that are stored FrameData byte buffer via RTMP/RTSP to my server IP, even If I need to compress it to a bitmap before...

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