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• Download hls stream without losing quality

  1er mars 2018, par Sinan Güler

  I tried using -i "input.m3u8" -codec:v copy -codec:a copy output.mp4
  The hls stream is in ts.

  I don’t think I’m getting the best quality, sometimes the video lags for a sec or two, audio is intact anyway.

  Am I using the right command line ?

• youtube-dl download one minute per every 5 minutes (on a twitch video, but i have the local file saved too if easier)

  18 mai 2016, par babadoctor

  I would like to do what the title says

  This is a ffmpeg command to download from a specific time in a video, offline or online.

  ffmpeg -ss (stop time) -i (direct video link) -t (start time) -c:v copy -c:a copy (title.mp4)

  I am going to be downloading this on OSX.
  I dont care what the title is.

  I think* there is a bash command that allows me to change the timings in this command up by a specific amount (+300 seconds per, the counter for start and stop time is in raw seconds)

  So, bash script that runs that command but increases the start and stop times incrementally by 300 (the stop timing being 60+ seconds ahead), downloads, then repeats.

• Merging 2 videos using JavaCV, application does not crash, but stops responding

  27 juin 2013, 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);
  
  }

  Now First i've got the int i which if it's 0, then it's the first video created, and will ignore merging, and then its going to be incremented, and on the second video, it will enter the merging code.
  Now, i've put a lot of log's and from what I can see, it enters my first while function from the merge code :

  while ((frame = grabber1.grabFrame()) != null) {
  
              j++;
  
              recorder2.record(frame);
  
              Log.i(LOG_TAG, "while1 nr:" + j + "Frame number: " + grabber1.getFrameNumber());
  
          }

  It does not crash, but at a time, it stops, and then it doesn't do anything. If it would be stuck in the while function, then my log should continue to appear. But like this it stops, and then it does not go into the second while (i do not get the log after while1.
  What could be the problem ? It does not force crash, LogCat doesn't show me any errors, it just does not continue to the second while