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• How can I record audio along with Aforge player video recording ?

  4 juin 2019, par H.NS

  My app is playing webcam video using Aforge Plyer. Now I want to record this video. Using Aforge player audio recording is not possible.

  Is there any way to record audio separately and merge it with recorded video using Aforge player ?

  Found that using Direct Show architecture is the way to achieve this. But it will be very difficult to change the architecture at the last time of development. Since I’m unaware with directshow concepts and almost 90 percentage of my project is completed with Aforge player.

  My current code is here. It can record video from selected webcam using aforge player. But audio is missing

  using AForge.Video;
  
  using AForge.Video.DirectShow;
  
  using Accord.Video.FFMPEG;
  
  
  
      private FilterInfoCollection VideoCaptureDevices;
  
      private VideoCaptureDevice FinalVideo = null;
  
      private VideoCaptureDeviceForm captureDevice;
  
      private Bitmap video;
  
      private VideoFileWriter FileWriter = new VideoFileWriter();
  
      private SaveFileDialog saveAvi;
  
  
  
      private void VideoRecord_Load(object sender, EventArgs e)
  
      {
  
          VideoCaptureDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
  
          captureDevice = new VideoCaptureDeviceForm();
  
      }
  
      private void play_Click(object sender, EventArgs e)
  
      {
  
          if (captureDevice.ShowDialog(this) == DialogResult.OK)
  
          {
  
              VideoCaptureDevice videoSource = captureDevice.VideoDevice;
  
              FinalVideo = captureDevice.VideoDevice;
  
              FinalVideo.NewFrame += new NewFrameEventHandler(FinalVideo_NewFrame);
  
              FinalVideo.Start();
  
          }
  
      }
  
      void FinalVideo_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          if (butStop.Text == "Stop Record")
  
          {
  
              video = (Bitmap)eventArgs.Frame.Clone();
  
              FileWriter.WriteVideoFrame(video);
  
          }
  
          else
  
          {
  
              video = (Bitmap)eventArgs.Frame.Clone();;
  
          }
  
      }
  
      private void Record_Click(object sender, EventArgs e)
  
      {
  
          saveAvi = new SaveFileDialog();
  
          saveAvi.Filter = "Avi Files (*.avi)|*.avi";
  
          if (saveAvi.ShowDialog() == System.Windows.Forms.DialogResult.OK)
  
          {
  
              int h = captureDevice.VideoDevice.VideoResolution.FrameSize.Height;
  
              int w = captureDevice.VideoDevice.VideoResolution.FrameSize.Width;
  
              FileWriter.Open(saveAvi.FileName, w, h, 25, VideoCodec.Default, 5000000);
  
              FileWriter.WriteVideoFrame(video);
  
              butStop.Text = "Stop Record";
  
          }
  
      }
  
      private void stopRecord_Click(object sender, EventArgs e)
  
      {
  
          if (butStop.Text == "Stop Record")
  
          {
  
              butStop.Text = "Stop";
  
              if (FinalVideo == null)
  
              { return; }
  
              if (FinalVideo.IsRunning)
  
              {
  
                  FileWriter.Close();
  
              }
  
          }
  
          else
  
          {
  
              this.FinalVideo.Stop();
  
              FileWriter.Close();
  
          }
  
      }
  
  }
  
  }

• Use ffmpeg with libx264 encoded video has no timeline in player

  23 octobre 2015, par xiaoym

  Use ffmpeg with libx264 encoded video can open with M Player, but has no timeline showed.My code like below

  avcodec_register_all();
  
  AVCodec *codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  AVCodecContext *ctx = avcodec_alloc_context3(codec);
  
  
  
   ctx->bit_rate = 40 * 1024 * 1024;
  
  
  
  ctx->width = width / 2 * 2;
  
  ctx->height = height / 2 * 2;
  
  ctx->time_base = (AVRational){1, 25};
  
  // ctx->ticks_per_frame = 2;
  
  ctx->me_method = 10;
  
  // ctx->gop_size = 10;
  
  ctx->max_b_frames = 1;
  
  ctx->pix_fmt = AV_PIX_FMT_YUV420P;
  
  ctx->profile = FF_PROFILE_H264_BASELINE;
  
  
  
  // picture is has frame data. encode with a loop.
  
  int out_size = avcodec_encode_video2(ctx->ctx, &pkt, picture, &got_output);
  
  if (got_output) {
  
      fwrite(pkt.data, 1, pkt.size, outFile);
  
      av_free_packet(&pkt);
  
  }
  
  
  
  // after all frame encoded, write this
  
  uint8_t endcode[] = { 0, 0, 1, 0xb7 };
  
  fwrite(endcode, 1, sizeof(endcode), outFile);

  Most of the code is copied from doc/examples/decoding_encoding.c.

  Any help will be appreciated !

• Why does Youtube player stretch MPEG1/2 video not H.264 ?

  25 juin 2017, par Maru

  I want to upload the video on Youtube and I have this particular MKV file.

  

  and I used ffmpeg to convert it to MP4 and hard code the ass subtitle into it.

  Now my question is

  When I simply tried converting the video without a sub and uploaded on Youtube,
  so it retained its original vcodec.

  ffmpeg -i "input.mkv" -c:v copy -c:a aac "output.mp4"

  The video (vcodec MPEG-1/2) is played with 16:9 ratio.

  However, when I put a sub on it, so the video need to be re-encoded.
  (In this case, I chose to preserve the quality by making it lossless.)

  ffmpeg -i "input.mkv" -preset veryslow -crf 0 -c:a aac -vf "ass=sub.ass" "output.mp4"

  Now the subbed video has vcodec of H.264.

  However, Youtube player keep its original aspect of 720x480 and there is a black bar on the side of the video.

  Therefore, I am curious why is it such a case ? even though VLC told me that both has the same resolution of 720x480.

  Furthermore, is there anyway I can adjust the aspect ratio on Youtube ?

  I know that I can simply scale the video with ffmpeg,

  but I was wondering if there is anyway I can tell Youtube to play the aspect ration that I want ? I think the formatting tags no longer works....