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• Record Sound on Ubuntu Docker Image

  12 avril 2017, par Daniel Rasmuson

  I would like record audio with ffmpeg when I capture my screen. The error I’m getting when using alsa is that is that my image does not have a sound card -f alsa -ac 2 -i hw:0

  Here is how to reproduce on a fresh version of Ubuntu

  Start a session in a new ubuntu docker image.

  docker pull ubuntu
  
  docker run -it --rm ubuntu

  Setup alsa (Advanced Linux Sound Architecture)

  apt-get update
  
  apt-get install alsa-utils

  List the sound cards

  aplay -l
  
  # aplay: device_list:268: no soundcards found...

  And playing this sound will fail because this image doesn’t have any sound cards

  sudo aplay /usr/share/sounds/alsa/Front_Center.wav

• How to record live streamed video from rtsp url in android

  22 mars 2017, par Astro

  I am doing an android application. In my application I need to record live streamed video.And here I am using rtsp protocol and ffmpeg library to stream and record video.Live streaming is working properly, but video recording is not working. I think it’s a problem of URL Connection I am used here to record video.But I don’t know what is the correct connection method.I search lot about this, but can’t find anything. If anybody know this please help me.

  This is my startRecording() method

  private void startRecording() {
  
  
  
      try {
  
  
  
          URL url = new URL(path);
  
          URLConnection urlConnection1 = url.openConnection();
  
          in1 = new BufferedInputStream(urlConnection1.getInputStream());
  
  
  
      } catch (IOException e) {
  
          e.printStackTrace();
  
      } 
  
  
  
      try {
  
  
  
          mIn = new MjpegInputStream(in1,MIN_ARRAY_LENGTH);
  
          mIn.resetFrameCount();
  
        //  return new MjpegInputStream(in, MIN_ARRAY_LENGTH);
  
          recorder.start();
  
          calltimer();
  
  
  
          audioStatus = Micstatus.equals("1");
  
          startTime = 0;
  
          completedFrames = 0;
  
          audioCompleted = 0;
  
  
  
          isRecording = true;
  
          if (isJelliBean) {
  
              resetTextureLayout();
  
          }
  
          trial.setCanZoom(isRecording);
  
          setMenuEnabled();
  
  
  
          threadVideo = new VideoRecording();
  
          threadVideo.start();
  
  
  
          if (audioStatus) {
  
              threadAudio = new AudioRecordRunnables();
  
              threadAudio.start();
  
          }
  
  
  
  
  
      } catch (Exception e) {
  
          try {
  
  
  
              isRecording = false;
  
              trial.setCanZoom(isRecording);
  
              setMenuEnabled();
  
  
  
              Toast.makeText(getApplicationContext(), "Try again1", Toast.LENGTH_SHORT).show();
  
          } catch (Exception e1) {
  
          }
  
      }
  
  
  
  }

  This is my ViedoRecording class

  private class VideoRecording extends Thread implements Runnable {
  
  
  
      public void run() {
  
          try {
  
  
  
  
  
              int i = -1;
  
              int cc = 0;
  
              int completed = 0;
  
  
  
              FileOutputStream out;
  
              RecordingHelper recordingHelper;
  
              try {
  
                  Thread.sleep(VIDEO_FRAME_RATE < 6 ? 2000 : 300);
  
              } catch (Exception e) {
  
  
  
              }
  
              String file = getCacheDir() + "/temp.jpg";
  
              opencv_core.IplImage iplImage;
  
              runOnUiThread(videoTimeRunnable);
  
  
  
              while (isRecording || completed < mIn.totalFrames || true)             {
  
                  try {
  
                      if (cc < 10) {
  
                          cc++;
  
                      }
  
  
  
                      if (i > (MIN_ARRAY_LENGTH - 2)) {
  
                          i = -1;
  
                      }
  
                      recordingHelper = mIn.datas[i + 1];
  
  
  
  
  
                      if (recordingHelper != null && recordingHelper.length > 1) {
  
                          i++;
  
                          completed++;
  
                          if (startTime == 0) {
  
                              startTime = System.currentTimeMillis();
  
                          }
  
  
  
                          completedFrames++;
  
  
  
  
  
                          out = new FileOutputStream(file);
  
                          out.write(recordingHelper.data);
  
                          out.flush();
  
  
  
                          out.close();
  
  
  
                          Log.e("recording", "=" + recordingHelper.rotaion);
  
                          iplImage = cvLoadImage(file, 1);
  
  
  
                          OpenCVFrameConverter.ToIplImage grabberConverter = new OpenCVFrameConverter.ToIplImage();
  
                          Frame frame = grabberConverter.convert(iplImage);
  
                          recorder.record(frame);
  
                          opencv_core.cvReleaseImage(iplImage);
  
                          mIn.datas[i] = null;
  
                          totalFramesRecordedByActivity++;
  
                          runOnUiThread(videoTimeRunnable);
  
  
  
                      } else if (!isRecording && startTime > 0) {
  
                          break;
  
                      } else if (cc > 5 && mIn.totalFrames < 1) {
  
                          break;
  
                      }
  
  
  
                  } catch (Exception e) {
  
  
  
                  }
  
  
  
              }
  
  
  
              new File(file).delete();
  
              endTime = System.currentTimeMillis();
  
              videoThreadFinished = true;
  
  
  
              finalizeRecording();
  
  
  
  
  
          } catch (Throwable t) {
  
              finishThis();
  
  
  
          }
  
  
  
      }
  
  }

• Record a html5 page as a video

  14 mars 2017, par user1427930

  My goal is to have a Ubuntu (Desktop) server that "simply" converts html5 webpages into videos. I want to capture the smooth css and js-animations.

  So far I’ve tried this : (phantomjs)
  https://gist.github.com/phanan/e03f75082e6eb114a35c

  The timing and framerate is either choppy or to fast.

  My best solution so far is to open up a Google Chrome window in kiosk mode, wait 3 seconds and then record via ffmpeg with x11grab. It feels like a "bloaty" and unprofessional solution.

  program.sh

  #!/bin/bash
  
  duration=$1
  
  outputFile=$2
  
  stop=$(($duration+5))
  
  
  
  ./openBrowser.sh $stop & PIDOIS=$!
  
  ./recScreen.sh $duration $outputFile & PIDMIX=$!
  
  wait $PIDIOS
  
  wait $PIDMIX

  recScreen.sh

  #!/bin/bash
  
  sleep 3
  
  ffmpeg -video_size 1920x1080 -framerate 30 -f x11grab -i :0.0 -c:v libx264 -qp 0 -preset ultrafast -t "$1" "$2".mkv
  
  killall -9 chrome

  openBrowser.sh

  #!/bin/bash
  
  /usr/bin/google-chrome --kiosk --incognito http://localhost/testanimation

  Can this be done in a different way ? Perhaps a virtual display ? (must have GPU though). This should be as a desktop server so I don’t want popups or any fail messages from the OS (as it would be burned into the video...)