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• FFmpeg : Audio Filter taking too long

  29 novembre 2018, par Prashant_Sarin

  I am using the code below to apply a volume filter in ffmpeg, but it is taking too long. A 5-minute audiofile filter takes 3 minutes. Can someone give advice on how I can speed it up.

  My command is :

  var command = "-i $audioPath -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame $outputFile"

  Logs are :

  2018-11-29 16:58:22.487 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress -    ---AudioVolume---- size=    1537kB time=00:01:40.41 bitrate= 125.4kbits/s speed=1.13x    
  
  2018-11-29 16:58:22.489 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- video:0kB audio:1518kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.260607%
  
  2018-11-29 16:58:22.490 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: utime=86.707s
  
  2018-11-29 16:58:22.491 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- bench: maxrss=65792kB
  
  2018-11-29 16:58:22.492 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: onProgress ----AudioVolume---- [aac @ 0xb1ce4400] Qavg: 17415.965 
  
  2018-11-29 16:58:22.493 23387-23387/com.example.prashants.ffmpegtest D/com.example.prashants.ffmpegtest.service.AudioOverlayService: AudioVolume success--------- -benchmark -threads 4 -i /storage/emulated/0/FFmpegTest/looped.m4a -af volume=enable='between(t,5,10)+between(t,15,20)':volume=0.25:eval=frame 
  
  /storage/emulated/0/FFmpegTest/filtered_audio.m4a

• Video duration is the double of what it should be

  12 juin 2019, par lulas

  I was trying to record my computer screen, for that I am using Accord.

  I had everything working fine with the Accord version 3.8.0.0, but when I upgraded to the version 3.8.2.0-alpha my recording videos are slow down, and they take approximately the double to finish.

  So a 10 second video actually takes 20 seconds to play (in the video player the duration of the video is also 10 seconds).

  I searched in google and didn’t managed to find anything usefull. Probably due to the alpha version of the release.

  I managed to find a project from one of the maintainers of the Accord project that uses this 3.8.2.0-alpha version : https://github.com/cesarsouza/screencast-capture

  I downloaded the zip file, extracted the project, built the project, fixed a compilation error (change a Dispose() to Stop()) and then ran the application, but the problem still exists... the generated video files are still slow down...

  The main methods of my code with the 3.8.2.0-alpha version are these (they were taken from the previous project I downloaded) :

  public void StartRecording()
  
  {
  
      if (IsRecording || !IsPlaying)
  
          return;
  
  
  
      int height = area.Height;
  
      int width = area.Width;
  
      Rational framerate = new Rational(1000, screenStream.FrameInterval);
  
      int videoBitRate = 1200 * 1000;
  
  
  
      OutputPath = Path.Combine(main.CurrentDirectory, fileName);
  
      RecordingStartTime = DateTime.MinValue;
  
      videoWriter = new VideoFileWriter();
  
      videoWriter.BitRate = videoBitRate;
  
      videoWriter.FrameRate = framerate;
  
      videoWriter.Width = width;
  
      videoWriter.Height = height;
  
      videoWriter.VideoCodec = VideoCodec.H264;
  
      videoWriter.VideoOptions["crf"] = "18";
  
      videoWriter.VideoOptions["preset"] = "veryfast";
  
      videoWriter.VideoOptions["tune"] = "zerolatency";
  
      videoWriter.VideoOptions["x264opts"] = "no-mbtree:sliced-threads:sync-lookahead=0";
  
  
  
      videoWriter.Open(OutputPath);
  
  
  
      HasRecorded = false;
  
      IsRecording = true;
  
  }
  
  
  
  void VideoPlayer_NewFrameReceived(object sender, Accord.Video.NewFrameEventArgs eventArgs)
  
  {
  
      DateTime currentFrameTime = eventArgs.CaptureFinished;
  
  
  
      // Encode the last frame at the same time we prepare the new one
  
      Task.WaitAll(
  
          Task.Run(() =>
  
          {
  
              lock (syncObj) // Save the frame to the video file.
  
              {
  
                  if (IsRecording)
  
                  {
  
                      if (RecordingStartTime == DateTime.MinValue)
  
                          RecordingStartTime = DateTime.Now;
  
  
  
                      TimeSpan timestamp = currentFrameTime - RecordingStartTime;
  
                      if (timestamp > TimeSpan.Zero)
  
                          videoWriter.WriteVideoFrame(this.lastFrame, timestamp, this.lastFrameRegion);
  
                  }
  
              }
  
          }),
  
  
  
          Task.Run(() =>
  
          {
  
              // Adjust the window according to the current capture
  
              // mode. Also adjusts to keep even widths and heights.
  
              CaptureRegion = AdjustWindow();
  
  
  
              // Crop the image if the mode requires it
  
              if (CaptureMode == CaptureRegionOption.Fixed ||
  
                  CaptureMode == CaptureRegionOption.Window)
  
              {
  
                  crop.Rectangle = CaptureRegion;
  
  
  
                  eventArgs.Frame = croppedImage = crop.Apply(eventArgs.Frame, croppedImage);
  
                  eventArgs.FrameSize = crop.Rectangle.Size;
  
              }
  
  
  
              //// Draw extra information on the screen
  
              bool captureMouse = Settings.Default.CaptureMouse;
  
              bool captureClick = Settings.Default.CaptureClick;
  
              bool captureKeys = Settings.Default.CaptureKeys;
  
  
  
              if (captureMouse || captureClick || captureKeys)
  
              {
  
                  cursorCapture.CaptureRegion = CaptureRegion;
  
                  clickCapture.CaptureRegion = CaptureRegion;
  
                  keyCapture.Font = Settings.Default.KeyboardFont;
  
  
  
                  using (Graphics g = Graphics.FromImage(eventArgs.Frame))
  
                  {
  
                      g.CompositingQuality = CompositingQuality.HighSpeed;
  
                      g.SmoothingMode = SmoothingMode.HighSpeed;
  
  
  
                      float invWidth = 1; // / widthScale;
  
                      float invHeight = 1; // / heightScale;
  
  
  
                      if (captureMouse)
  
                          cursorCapture.Draw(g, invWidth, invHeight);
  
  
  
                      if (captureClick)
  
                          clickCapture.Draw(g, invWidth, invHeight);
  
  
  
                      if (captureKeys)
  
                          keyCapture.Draw(g, invWidth, invHeight);
  
                  }
  
              }
  
          })
  
      );
  
  
  
      // Save the just processed frame and mark it to be encoded in the next iteration:
  
      lastFrame = eventArgs.Frame.Copy(lastFrame);
  
  
  
      lastFrameRegion = new Rectangle(0, 0, eventArgs.FrameSize.Width, eventArgs.Frame.Height);
  
  }

  Anyone knows what might be problem causing this slow down ?

  EDIT :

  I think I managed to find my problem :

  pts:4.032000e+003   pts_time:0.252  dts:2.016000e+003   dts_time:0.126  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:6.720000e+003   pts_time:0.42   dts:3.360000e+003   dts_time:0.21   duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:1.075200e+004   pts_time:0.672  dts:5.376000e+003   dts_time:0.336  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:1.344000e+004   pts_time:0.84   dts:6.720000e+003   dts_time:0.42   duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:1.612800e+004   pts_time:1.008  dts:8.064000e+003   dts_time:0.504  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:1.881600e+004   pts_time:1.176  dts:9.408000e+003   dts_time:0.588  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:2.150400e+004   pts_time:1.344  dts:1.075200e+004   dts_time:0.672  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:2.553600e+004   pts_time:1.596  dts:1.276800e+004   dts_time:0.798  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:2.822400e+004   pts_time:1.764  dts:1.411200e+004   dts_time:0.882  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:3.091200e+004   pts_time:1.932  dts:1.545600e+004   dts_time:0.966  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:3.494400e+004   pts_time:2.184  dts:1.747200e+004   dts_time:1.092  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:3.897600e+004   pts_time:2.436  dts:1.948800e+004   dts_time:1.218  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:4.166400e+004   pts_time:2.604  dts:2.083200e+004   dts_time:1.302  duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:4.704000e+004   pts_time:2.94   dts:2.352000e+004   dts_time:1.47   duration:6.720000e+002  duration_time:0.042 stream_index:0
  
  pts:5.107200e+004   pts_time:3.192  dts:2.553600e+004   dts_time:1.596  duration:6.720000e+002  duration_time:0.042 stream_index:0

  The PTS is always the double of DTS, that’s why the video is presented in a slow down way.

  Unfortunately I have no idea why this happens... Anyone has any clue ?

• windows CMD send CRLF inside double quote

  23 octobre 2022, par uingtea

  I want to pass multiple headers for ffplay or ffmpeg, it say I need to split with CRLF. on linux I can use \ or $'\r\n' but how for windows ?

  



  SET CRLF=^
ffplay -v debug -i "http://example.com/test" -headers "Accept-Language: en-US,en;q=0.5%CRLF%Connection: keep-alive"


  



  debug log : Connection: keep-alive is not sent

  



  [http @ 04df3f40] No trailing CRLF found in HTTP header.
[http @ 04df3f40] request: GET /test HTTP/1.1 0KB sq=    0B f=0/0
User-Agent: Lavf/57.37.101
Accept: */*
Range: bytes=0-
Connection: close
Host: example.com
Icy-MetaData: 1
Accept-Language: en-US,en;q=0.5


  



  thanks