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• Unity : Converting Texture2D to YUV420P and sending with UDP using FFmpeg

  22 juin 2018, par potu1304

  In my Unity game each frame is rendered into a texture and then put together into a video using FFmpeg. Now my questions is if I am doing this right because avcodec_send_frame throws every time an exception.
  I am pretty sure that I am doing something wrong or in the wrong order or simply missing something.

  Here is the code for capturing the texture :

  void Update() {
  
          //StartCoroutine(CaptureFrame());
  
  
  
          if (rt == null)
  
          {
  
              rect = new Rect(0, 0, captureWidth, captureHeight);
  
              rt = new RenderTexture(captureWidth, captureHeight, 24);
  
              frame = new Texture2D(captureWidth, captureHeight, TextureFormat.RGB24, false);
  
          }
  
  
  
          Camera camera = this.GetComponent<camera>(); // NOTE: added because there was no reference to camera in original script; must add this script to Camera
  
          camera.targetTexture = rt;
  
          camera.Render();
  
  
  
          RenderTexture.active = rt;
  
          frame.ReadPixels(rect, 0, 0);
  
          frame.Apply();
  
  
  
          camera.targetTexture = null;
  
          RenderTexture.active = null;
  
  
  
          byte[] fileData = null;
  
          fileData = frame.GetRawTextureData();
  
          encoding(fileData, fileData.Length);
  
  
  
      }
  
  </camera>

  And here is the code for encoding and sending the byte data :

  private unsafe void encoding(byte[] bytes, int size)
  
      {
  
          Debug.Log("Encoding...");
  
          AVCodec* codec;
  
          codec = ffmpeg.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264);
  
          int ret, got_output = 0;
  
  
  
          AVCodecContext* codecContext = null;
  
          codecContext = ffmpeg.avcodec_alloc_context3(codec);
  
          codecContext->bit_rate = 400000;
  
          codecContext->width = captureWidth;
  
          codecContext->height = captureHeight;
  
          //codecContext->time_base.den = 25;
  
          //codecContext->time_base.num = 1;
  
  
  
          AVRational timeBase = new AVRational();
  
          timeBase.num = 1;
  
          timeBase.den = 25;
  
          codecContext->time_base = timeBase;
  
          //AVStream* videoAVStream = null;
  
          //videoAVStream->time_base = timeBase;
  
  
  
  
  
  
  
          AVRational frameRate = new AVRational();
  
          frameRate.num = 25;
  
          frameRate.den = 1;
  
          codecContext->framerate = frameRate;
  
  
  
          codecContext->gop_size = 10;
  
          codecContext->max_b_frames = 1;
  
          codecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;
  
  
  
          AVFrame* inputFrame;
  
          inputFrame = ffmpeg.av_frame_alloc();
  
          inputFrame->format = (int)codecContext->pix_fmt;
  
          inputFrame->width = captureWidth;
  
          inputFrame->height = captureHeight;
  
          inputFrame->linesize[0] = inputFrame->width;
  
  
  
          AVPixelFormat dst_pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P, src_pix_fmt = AVPixelFormat.AV_PIX_FMT_RGBA;
  
          int src_w = 1920, src_h = 1080, dst_w = 1920, dst_h = 1080;
  
          SwsContext* sws_ctx;
  
  
  
          GCHandle pinned = GCHandle.Alloc(bytes, GCHandleType.Pinned);
  
          IntPtr address = pinned.AddrOfPinnedObject();
  
  
  
          sbyte** inputData = (sbyte**)address;
  
          sws_ctx = ffmpeg.sws_getContext(src_w, src_h, src_pix_fmt,
  
                               dst_w, dst_h, dst_pix_fmt,
  
                               0, null, null, null);
  
  
  
          fixed (int* lineSize = new int[1])
  
          {
  
              lineSize[0] = 4 * captureHeight;
  
              // Convert RGBA to YUV420P
  
              ffmpeg.sws_scale(sws_ctx, inputData, lineSize, 0, codecContext->width, inputFrame->extended_data, inputFrame->linesize);
  
          }
  
  
  
          inputFrame->pts = counter++;
  
  
  
          if (ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0)
  
              throw new ApplicationException("Error sending a frame for encoding!");
  
  
  
          AVPacket pkt;
  
          pkt = new AVPacket();
  
          //pkt.data = inData;
  
          AVPacket* packet = &pkt;
  
          ffmpeg.av_init_packet(packet);
  
  
  
          Debug.Log("pkt.size " + pkt.size);
  
          pinned.Free();
  
          AVDictionary* options = null;
  
          ffmpeg.av_dict_set(&options, "pkt_size", "1300", 0);
  
          ffmpeg.av_dict_set(&options, "buffer_size", "65535", 0);
  
          AVIOContext* server = null;
  
          ffmpeg.avio_open2(&server, "udp://192.168.0.1:1111", ffmpeg.AVIO_FLAG_WRITE, null, &options);
  
          Debug.Log("encoded");
  
          ret = ffmpeg.avcodec_encode_video2(codecContext, &pkt, inputFrame, &got_output);
  
          ffmpeg.avio_write(server, pkt.data, pkt.size);
  
          ffmpeg.av_free_packet(&pkt);
  
          pkt.data = null;
  
          pkt.size = 0;
  
      }

  And every time I start the game

    if (ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0)
  
              throw new ApplicationException("Error sending a frame for encoding!");

  throws the exception.
  Any help in fixing the issue would be greatly appreciated :)

• Java/OpenCV - How to do a lossless h264 video writing in openCV ?

  15 août 2018, par JohnDoeAnon

  in the last time I had some struggle with the VideoWriter in openCV under java. I want to write a video file in a *.mp4 container with h.264 codec - but I see no option to toggle bitrate or quality in openCV VideoWriter. I did build openCV with ffmpeg as backend. I just want to write the video file in exact quality values as the original input video.
  I also have some code to do the job

  import org.opencv.core.Mat;
  
  import org.opencv.core.Size;
  
  import org.opencv.videoio.VideoWriter;
  
  import org.opencv.videoio.Videoio;
  
  
  
  public class VideoOutput
  
  {
  
       private final int H264_CODEC = 33;
  
  
  
       private VideoWriter writer;
  
  
  
       private String filename;
  
  
  
       public VideoOutput (String filename)
  
       {
  
          writer = null;
  
  
  
          this.filename = filename;
  
      }
  
  
  
      public void initialize(double framesPerSecond, int height, int width) throws Exception
  
      {
  
  
  
          this.writer = new VideoWriter();
  
  
  
          this.writer.open(filename, H264_CODEC, framesPerSecond, new Size(width, height));
  
  
  
          if(!writer.isOpened())
  
          {
  
               Logging.LOGGER.severe("Could not create video output file " + filename + "\n");
  
  
  
               throw new Exception("Could not create video output file " + filename + "\n");
  
          }
  
      }
  
  
  
      public void setFrame(VideoFrame videoFrame) throws Exception
  
      {
  
           if (writer.isOpened()) 
  
           {
  
               Mat frame = ImageUtil.imageToMat(videoFrame.getFrame());
  
  
  
               writer.write(frame);
  
  
  
               frame.release();
  
           }
  
      }

  I hoped the VideoWriter gives some options to do the job but it seems not the way.

  So is there an option or flag that I am missing for lossless h264 video writing under openCV and java OR maybe there is another way to do this ?
  Please help me - if you have done this already I really would appreciate some example code to get things done.

  UPDATE

  I do have now a solution that fits for my application, so here it is :

  String fps = Double.toString(this.config.getInputConfig().getFramesPerSecond());
  
  
  
  Runtime.getRuntime().exec(
  
          new String[] {
  
          "C:\\ffmpeg-3.4.2-win64-static\\bin\\ffmpeg.exe",
  
          "-framerate",
  
          fps,
  
          "-i",
  
          imageOutputPath + File.separator +  "%01d.jpg",
  
          "-c:v",
  
          "libx265",
  
          "-crf",
  
          "1",
  
          imageOutputPath + File.separator +  "ffmpeg.mp4"
  
          }
  
      );

  Credits to @Gyan who gave me the correct ffmpeg call in this post :

  Win/ffmpeg - How to generate a video from images under ffmpeg ?

  Greets

• Unity : Converting Texture2D to YUV420P using FFmpeg

  23 juillet 2021, par strong_kobayashi

  I'm trying to create a game in Unity where each frame is rendered into a texture and then put together into a video using FFmpeg. The output created by FFmpeg should eventually be sent over the network to a client UI. However, I'm struggling mainly with the part where a frame is caught, and passed to an unsafe method as a byte array where it should be processed further by FFmpeg. The wrapper I'm using is FFmpeg.AutoGen.

  



  The render to texture method :

  



  private IEnumerator CaptureFrame()
{
    yield return new WaitForEndOfFrame();

    RenderTexture.active = rt;
    frame.ReadPixels(rect, 0, 0);
    frame.Apply();

    bytes = frame.GetRawTextureData();

    EncodeAndWrite(bytes, bytes.Length);
}


  



  The unsafe encoding method so far :

  



  private unsafe void EncodeAndWrite(byte[] bytes, int size)
{
    GCHandle pinned = GCHandle.Alloc(bytes, GCHandleType.Pinned);
    IntPtr address = pinned.AddrOfPinnedObject();

    sbyte** inData = (sbyte**)address;
    fixed(int* lineSize = new int[1])
    {
        lineSize[0] = 4 * textureWidth;
        // Convert RGBA to YUV420P
        ffmpeg.sws_scale(sws, inData, lineSize, 0, codecContext->width, inputFrame->extended_data, inputFrame->linesize);
    }

    inputFrame->pts = frameCounter++;

    if(ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0)
        throw new ApplicationException("Error sending a frame for encoding!");

    pkt = new AVPacket();
    fixed(AVPacket* packet = &pkt)
        ffmpeg.av_init_packet(packet);
    pkt.data = null;
    pkt.size = 0;

    pinned.Free();
    ...
}


  



  sws_scale takes a sbyte** as the second parameter, therefore I'm trying to convert the input byte array to sbyte** by first pinning it with GCHandle and doing an explicit type conversion afterwards. I don't know if that's the correct way, though.

  



  Moreover, the condition if(ffmpeg.avcodec_send_frame(codecContext, inputFrame) < 0) alwasy throws an ApplicationException, where I also really don't know why this happens. codecContext and inputFrame are my AVCodecContext and AVFrame objects, respectively, and the fields are defined as the following :

  



  codecContext

  



  codecContext = ffmpeg.avcodec_alloc_context3(codec);
codecContext->bit_rate = 400000;
codecContext->width = textureWidth;
codecContext->height = textureHeight;

AVRational timeBase = new AVRational();
timeBase.num = 1;
timeBase.den = (int)fps;
codecContext->time_base = timeBase;
videoAVStream->time_base = timeBase;

AVRational frameRate = new AVRational();
frameRate.num = (int)fps;
frameRate.den = 1;
codecContext->framerate = frameRate;

codecContext->gop_size = 10;
codecContext->max_b_frames = 1;
codecContext->pix_fmt = AVPixelFormat.AV_PIX_FMT_YUV420P;


  



  inputFrame

  



  inputFrame = ffmpeg.av_frame_alloc();
inputFrame->format = (int)codecContext->pix_fmt;
inputFrame->width = textureWidth;
inputFrame->height = textureHeight;
inputFrame->linesize[0] = inputFrame->width;


  



  Any help in fixing the issue would be greatly appreciated :)