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• Merging 2 videos using JavaCV, second video has no sound

  28 juillet 2022, par rosu alin

  This is the code I use :

  



  public void stopRecording() throws Exception, com.googlecode.javacv.FrameRecorder.Exception {

    runAudioThread = false;

    if (recorder != null && recording) {
        recording = false;
        Log.v(LOG_TAG, "Finishing recording, calling stop and release on recorder");
        try {
            recorder.stop();
            recorder.release();
        } catch (FFmpegFrameRecorder.Exception e) {
            e.printStackTrace();
        }

    }
    Log.i(LOG_TAG, "filename = " + ffmpeg_link);
    if (i > 0) {
        Log.i(LOG_TAG, "!!!!!!!!!WILL CONCATENATE");
        FrameGrabber grabber1 = new FFmpegFrameGrabber(pathStart + "/JavaCV/stream0.mp4");
        grabber1.start();
        Log.i(LOG_TAG, "graber1.start");
        FrameGrabber grabber2 = new FFmpegFrameGrabber(pathStart + "/JavaCV/stream1.mp4");
        grabber2.start();
        Log.i(LOG_TAG, "graber2.start");
        FrameRecorder recorder2 = new FFmpegFrameRecorder(pathStart + "/JavaCV/output.mp4", grabber1.getImageWidth(), grabber1.getImageHeight(), grabber1.getAudioChannels());
        recorder2.setFrameRate(grabber1.getFrameRate());
        recorder2.setSampleFormat(grabber1.getSampleFormat());
        recorder2.setSampleRate(grabber1.getSampleRate());
        Log.i(LOG_TAG, "Recorder.start");
        recorder2.start();
        Frame frame;
        int j = 0;
        while ((frame = grabber1.grabFrame()) != null) {
            j++;
            recorder2.record(frame);
            Log.i(LOG_TAG, "while1 nr:" + j + "Frame number: " + grabber1.getFrameNumber());
        }
        Log.i(LOG_TAG, "after while1");
        while ((frame = grabber2.grabFrame()) != null) {
            recorder2.record(frame);
            Log.i(LOG_TAG, "while2");
        }
        Log.i(LOG_TAG, "Recorder.stop");
        recorder2.stop();
        grabber2.stop();
        grabber1.stop();
        Log.i(LOG_TAG, "end concatenate");
    }
    i++;
    ffmpeg_link = pathStart + "/JavaCV/stream" + i + ".mp4";
    Log.i(LOG_TAG, "next filename = " + ffmpeg_link);
}


  



  It works great, it manages to merge the videos, the only issue I have is that it does not have sound for the second video. How can i put the audiochannel on the second video also ?

  


• ffmpeg final video no audio when combining images + video clips that have sound

  14 juillet 2022, par Cabdi Cilm

  I am using pytube to merge some downloaded clips and it downloads the clips with audio in the final folder, however when it combines the 2 clips together, there is no audio.

  


  config.IMG_WIDTH = None
final_clip = concatenate(clips, method="compose")
ffmpeg_write_video(
    final_clip,
    os.path.join(os.path.dirname(__file__), "final", "final_vid.mp4"),
    fps=60,
    codec="h264_amf",
    bitrate="8000k",
    logger="bar" if config.LOADING_BAR == "Y" else None,
    threads=5,
    ffmpeg_params=[
        "-tile-columns",
        "6",
        "-frame-parallel",
        "0",
        "-auto-alt-ref",
        "1",
        "-lag-in-frames",
        "25",
        "-g",
        "128",
        "-pix_fmt",
        "yuv420p",
        "-row-mt",
        "1",
    ],
)


  


• Merging/concatenating video and keeping sound in R using AV package

  30 juin 2022, par Jack Cornwall

  I am trying to merge/concatenate multiple videos with sound sequentially into one video using only R, (I don't want to work with ffmpeg in the command line as the rest of the project doesn't require it and I would rather not bring it in at this stage).

  


  My code looks like the following :

  


  dir<-"C:/Users/Admin/Documents/r_programs/"

videos<-c(
  paste0(dir,"video_1.mp4"),
  paste0(dir,"video_2.mp4"),
  paste0(dir,"video_3.mp4")
)

#encoding
av_encode_video(
  videos,
  output=paste0(dir,"output.mp4"),
  framerate=30,
  vfilter="null",
  codec="libx264rgb",
  audio=videos,
  verbose=TRUE
)


  


  It almost works, the output file is an mp4 containing the 3 videos sequentially one after the other, but the audio present is only from the first of the 3 video and then it cuts off.

  


  It doesn't really matter what the videos are. I have recreated this issue with the videos I was using or even 3 randomly downloaded 1080p 30fps videos from YouTube.

  


  Any help is appreciated & thank you in advance.