Recherche avancée

Sur d’autres sites (4013)

• ffmpeg screen capture using screen-capture-recorder cmd not working in vb

  14 juin 2014, par user3234288

  I’ve started ffmpeg as process in VB but ffmpeg cmd for capturing alone is not working. My code is,I don’t know how to solve the problem, if any help greatly appreciated

  proc.StartInfo.FileName = System.Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments) & "\converter\bin\ffmpeg.exe"            
  
  proc.StartInfo.Arguments = "-f dshow -i video=screen-capture-recorder screen.mp4"
  
  proc.StartInfo.UseShellExecute = False
  
  proc.StartInfo.WindowStyle = ProcessWindowStyle.Hidden
  
  proc.StartInfo.RedirectStandardInput = True
  
  proc.StartInfo.RedirectStandardOutput = True
  
  proc.StartInfo.CreateNoWindow = True
  
  proc.Start()

• Android video stream to windows desktop - Latency Issue

  5 décembre 2019, par cagney

  I am using an android v21 device to stream data to a javafx application. Its working fine but I have about 2 seconds of latency.

  As of now the basic transportation goes like this

  1. android Cameratompegtest.class unkown latency
  2. android packetizer(udp) 10 millis
  3. windows depacketizer no buildup of data in buffers
  4. windows ffmpeg framgrabber unkown latency
  5. javafx imageview <1 millis

  My data stream to my desktop and my packetizer is much faster than my frame rate and is often just waiting. There is no buildup of data anywhere else and therefore I assume no delay in any of my code. My big question is in regards to android MediaEncoder and secondly ffmpeg frame grabber.

  How can I determine the cause of the slow down ?

  Do you have any suggestions ?

  My ffmpeg framgrabber

      public RapidDecoder(final InputStream inputStream, final ImageView view)
  
  {
  
      System.out.println(TAG + " starting");
  
  
  
       grabber = new FFmpegFrameGrabber(inputStream, 0);
  
       converter = new Java2DFrameConverter();
  
       mView = view;
  
  
  
  
  
      emptyBuffer = new Runnable() {
  
          @Override
  
          public void run() {
  
              System.out.println(TAG + " emptybuffer thread running");
  
              try {
  
  
  
                  grabber.setOption("preset", "ultrafast");
  
  
  
  
  
                  grabber.start();
  
              }catch (Exception e)
  
              {
  
                  System.out.println(TAG + e);
  
              }
  
  
  
              while (true)
  
              {
  
  
  
                  try{
  
                      grabFrame();
  
                      Thread.sleep(1);
  
                  }catch (Exception e)
  
                  {
  
                      System.out.println(TAG + " emptybuffer " + e);
  
                  }
  
  
  
              }
  
  
  
  
  
  
  
          }
  
      };
  
  
  
      display = new Runnable() {
  
          @Override
  
          public void run() {
  
  
  
              System.out.println(TAG + " display thread running ");
  
  
  
              while(true)
  
              {
  
  
  
                  try{
  
                      displayImage();
  
                      Thread.sleep(10);
  
                  }catch (Exception e)
  
                  {
  
                      System.out.println(TAG + " display " + e);
  
                  }
  
  
  
              }
  
  
  
  
  
          }
  
      };
  
  
  
  
  
  
  
  
  
  }
  
  
  
  
  
  public void generateVideo()
  
  {
  
      System.out.println(TAG + " genvid ");
  
  
  
  
  
  
  
  
  
      new Thread(emptyBuffer).start();
  
      new Thread(display).start();
  
  
  
  
  
  
  
  }
  
  
  
  
  
  
  
  public synchronized void grabFrame() throws FrameGrabber.Exception
  
  {
  
             //frame = grabber.grabFrame();
  
          frame = grabber.grab();
  
      //System.out.println("grab");
  
  
  
  
  
  }
  
  
  
  public synchronized void displayImage()
  
  {
  
  
  
  
  
      bufferedImage = converter.convert(frame);
  
      frame = null;
  
      if (bufferedImage == null) return;
  
      mView.setImage(SwingFXUtils.toFXImage(bufferedImage, null));
  
      //System.out.println("display");
  
  }

  }

  my android code taken from bigflake website can be found here

  https://bigflake.com/mediacodec/CameraToMpegTest.java.txt

• Pydub - problem when changing the directory of ffmpeg

  1er mai 2020, par Andy_ye

  In the pydub library, it looks at C:\\ as a default for searching for the ffmpeg folder.

  &#xA;&#xA;

  Because of this, the library works fine when I put the ffmpeg folder at C:\\

  &#xA;&#xA;

  However, to package FFmpeg with the python code and use it in another computer without ffmpeg, I have to point the pydub library to look for ffmpeg somewhere else, in another path.

  &#xA;&#xA;

  I tried to do this with

  &#xA;&#xA;

  from pydub import AudioSegment
AudioSegment.converter = "/path/to/ffmpeg.exe"


  &#xA;&#xA;

  and also tried

  &#xA;&#xA;

  AudioSegment.ffmpeg = "/path/to/ffmpeg.exe"


  &#xA;&#xA;

  but both did not work at all when I moved the ffmpeg folder from C:\\

  &#xA;&#xA;

  Is there another way to do this ?

  &#xA;