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• real time video streaming in C#

  16 juin 2016, par Nuwan

  I’m developing an application for real time streaming. Two parts include for the streaming.
  I use a capture card to capture some live source and need to stream in real time.
  and also need to stream a local video file.

  To stream local video file in real time I use emgu cv to capture the video frame as bitmaps.
  To achieve this I create the bitmap list and I save captured bitmap to this list using one thread.
  and also I display those frames in a picture box. Bitmap list can store 1 second video. if frame rate is
  30 it will store 30 video frames. After filling this list I start another thread to encode that 1 second chunk
  video.

  For encoding purpose I use ffmpeg wrapper called nreco. I write that video frames to ffmpeg
  and start the ffmpeg to encode. After stopping that task I can get encoded data as byte array.

  Then I’m sending that data using UDP protocol through LAN.

  This works fine. But I cannot achieve the smooth streaming. When I received stream via VLC player there is some millisecond of delay between packets and also I noticed there a frame lost.

  private Capture _capture = null;
  
  Image frame;
  
  
  
  // Here I capture the frames and store them in a list
  
  private void ProcessFrame(object sender, EventArgs arg)
  
  {
  
       frame = _capture.QueryFrame();
  
       frameBmp = new Bitmap((int)frameWidth, (int)frameHeight, PixelFormat.Format24bppRgb);
  
       frameBmp = frame.ToBitmap(); 
  
  
  
  
  
   twoSecondVideoBitmapFramesForEncode.Add(frameBmp);
  
                          ////}
  
       if (twoSecondVideoBitmapFramesForEncode.Count == (int)FrameRate)
  
       {
  
           isInitiate = false;
  
           thread = new Thread(new ThreadStart(encodeTwoSecondVideo));
  
           thread.IsBackground = true;
  
           thread.Start();
  
       }  
  
   }
  
  
  
  public void encodeTwoSecondVideo()
  
  {
  
      List<bitmap> copyOfTwoSecondVideo = new List<bitmap>();
  
      copyOfTwoSecondVideo = twoSecondVideoBitmapFramesForEncode.ToList();
  
      twoSecondVideoBitmapFramesForEncode.Clear();
  
  
  
      int g = (int)FrameRate * 2;
  
  
  
      // create the ffmpeg task. these are the parameters i use for h264 encoding
  
  
  
          string outPutFrameSize = frameWidth.ToString() + "x" + frameHeight.ToString();
  
          //frame.ToBitmap().Save(msBit, frame.ToBitmap().RawFormat);
  
          ms = new MemoryStream();
  
          //Create video encoding task and set main parameters for the video encode
  
  
  
          ffMpegTask = ffmpegConverter.ConvertLiveMedia(
  
              Format.raw_video,
  
              ms,
  
              Format.h264,
  
              new ConvertSettings()
  
              {
  
  
  
                  CustomInputArgs = " -pix_fmt bgr24 -video_size " + frameWidth + "x" + frameHeight + " -framerate " + FrameRate + " ", // windows bitmap pixel format
  
                  CustomOutputArgs = " -threads 7 -preset ultrafast -profile:v baseline -level 3.0 -tune zerolatency -qp 0 -pix_fmt yuv420p -g " + g + " -keyint_min " + g + " -flags -global_header -sc_threshold 40 -qscale:v 1 -crf 25 -b:v 10000k -bufsize 20000k -s " + outPutFrameSize + " -r " + FrameRate + " -pass 1 -coder 1 -movflags frag_keyframe -movflags +faststart -c:a libfdk_aac -b:a 128k "
  
                  //VideoFrameSize = FrameSize.hd1080,
  
                  //VideoFrameRate = 30
  
  
  
              });
  
  
  
          ////////ffMpegTask.Start();
  
          ffMpegTask.Start();
  
  
  
  
  
        // I get the 2 second chunk video bitmap from the list and write to the ffmpeg 
  
    foreach (var item in copyOfTwoSecondVideo)
  
          {
  
              id++;
  
              byte[] buf = null;
  
              BitmapData bd = null;
  
              Bitmap frameBmp = null;
  
  
  
              Thread.Sleep((int)(1000.5 / FrameRate));
  
  
  
              bd = item.LockBits(new Rectangle(0, 0, item.Width, item.Height), ImageLockMode.ReadOnly, PixelFormat.Format24bppRgb);
  
              buf = new byte[bd.Stride * item.Height];
  
              Marshal.Copy(bd.Scan0, buf, 0, buf.Length);
  
              ffMpegTask.Write(buf, 0, buf.Length);
  
              item.UnlockBits(bd);
  
          }
  
     }
  
  </bitmap></bitmap>

  This is the process I used to achieve the live streaming. But the stream is not smooth. I tried using a queue instead
  of list to reduce the the latency to fill the list. Because I thought that latency happens encoding thread encode
  and send 2 second video very quickly. But when it finishes this encoding process of bitmap list not
  completely full. So encoding thread will stop until the next 2 second video is ready.

  If any one can help me to figure this out, it is very grateful. If the way of I’m doing this is wrong, please correct me.
  Thank You !

• lavc/speedhqdec : Add AV_CODEC_CAP_SLICE_THREADS

  13 mai 2024, par Tomas Härdin

  lavc/speedhqdec : Add AV_CODEC_CAP_SLICE_THREADS
  Each field slice is assigned to one thread.
  
  Serial performance is unaffected.
  

  • [DH] libavcodec/speedhqdec.c

• M3U8. Convert all parts to mp4 [closed]

  5 juin 2020, par Zikrulloh Tolibjonov

  My name is Zikrullah. I have the m3u8 file of the serial. 1 m3u8 file contains all parts of the series and all audio languages for the player. The parts in it were saved in ts format for 10 seconds (as far as I understand). When I opened the m3u8 file, it contained a link to other m3u8 files. If I'm not mistaken, these are separate m3u8s for audio languages. but all m3u8 and ts files related to the video are on a other server. I need to upload all the files to my server while keeping them all in order. Of course using php. I'm sorry if I made a mistake. I don't know English well, but I tried :)