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• Display video data to screen

  23 septembre 2014, par user3215358

  I’m trying to decode h264 video using HW with Stagefright library and render it.

  I want to display data to screen with SDL.

  I’m getting video data to MediaBuffer. For non H/W decoding video displays well by using FFMpeg library. Here is piece of rendering code.

  while (av_read_frame(pFormatCtx, &packet) >= 0) 
  
  {
  
      // Is this a packet from the video stream?
  
      if (packet.stream_index == videoStream) 
  
      {
  
          avcodec_decode_video2(pCodecCtx, pFrame, &frameFinished, &packet);
  
  
  
          if (frameFinished) 
  
          {
  
  
  
              SDL_UpdateYUVTexture(bmp, NULL, pFrame->data[0], 
  
                                              pFrame->linesize[0], 
  
                                              pFrame->data[1], 
  
                                              pFrame->linesize[1], 
  
                                              pFrame->data[2], 
  
                                              pFrame->linesize[2]); 
  
  
  
  
  
              rect.x = 0;
  
              rect.y = 0;
  
              rect.w = pCodecCtx->width;
  
              rect.h = pCodecCtx->height;
  
  
  
              SDL_SetRenderDrawColor(renderer, 0, 80, 0, 255);
  
              SDL_RenderClear(renderer); 
  
              SDL_RenderCopy(renderer, bmp, NULL, &rect); 
  
              SDL_RenderPresent(renderer); 
  
          }
  
      }

  But when i’m using H/W accelerated decoding, what I should use in SDL_UpdateYUVTexture(bmp, NULL,....) function.

  And Here is piece of H/W accelerated decoding.

  while (err != ERROR_END_OF_STREAM )
  
  {
  
  
  
      MediaBuffer *mVideoBuffer;
  
      MediaSource::ReadOptions options;
  
      err = mVideoDecoder->read(&mVideoBuffer, &options);
  
  
  
      if (err == OK) {
  
          if (mVideoBuffer->range_length() > 0) 
  
          {
  
              //SDL_UpdateYUVTexture(bmp, NULL,...); 
  
  
  
              rect.x = 0;
  
              rect.y = 0;
  
              rect.w = 640;
  
              rect.h = 480;
  
  
  
              SDL_SetRenderDrawColor(renderer, 0, 80, 0, 255);
  
              SDL_RenderClear(renderer); 
  
              SDL_RenderCopy(renderer, bmp, NULL, &rect); 
  
              SDL_RenderPresent(renderer); 
  
  
  
          }
  
          mVideoBuffer->release();
  
      }
  
  }

  How i should use SDL_UpdateYUVTexture(bmp, NULL,...) function ?

• +Note re : correct MIME type for SVG, otherwise browsers don't display them.

  2 septembre 2014, par scottschiller

  +Note re : correct MIME type for SVG, otherwise browsers don’t display them.

• How to Save and Display a Video Simultaneously using C# Aforge.NET framework ?

  8 avril 2014, par Akshay

  I am able to display the video from my webcam or any other integrated device into a picturebox . Also i am able to Save the video into an avi file using FFMPEG DLL files.
  I want to do both things simultaneously ie Save the video in the avi file as well as at the same time display the live feed too.
  This is for a surveillance project where i want to monitor the live feed and save those too.

  using System;
  
  using System.Collections.Generic;
  
  using System.ComponentModel;
  
  using System.Data;
  
  using System.Drawing;
  
  using System.Text;
  
  using System.Windows.Forms;
  
  
  
  using AForge.Video;
  
  using AForge.Video.DirectShow;
  
  using AForge.Video.FFMPEG;
  
  using AForge.Video.VFW;
  
  using System.Drawing.Imaging;
  
  using System.IO;
  
  
  
  namespace cam_aforge1
  
  {
  
  public partial class Form1 : Form
  
  {
  
      private bool DeviceExist = false;
  
      private FilterInfoCollection videoDevices;
  
      private VideoCaptureDevice videoSource = null;
  
  
  
      public Form1()
  
      {
  
          InitializeComponent();
  
      }
  
  
  
      private void getCamList()
  
      {
  
          try
  
          {
  
              videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
  
              comboBox1.Items.Clear();
  
              if (videoDevices.Count == 0)
  
                  throw new ApplicationException();
  
  
  
              DeviceExist = true;
  
              foreach (FilterInfo device in videoDevices)
  
              {
  
                  comboBox1.Items.Add(device.Name);
  
              }
  
              comboBox1.SelectedIndex = 0; //make dafault to first cam
  
          }
  
          catch (ApplicationException)
  
          {
  
              DeviceExist = false;
  
              comboBox1.Items.Add("No capture device on your system");
  
          }
  
      }
  
  
  
      private void rfsh_Click(object sender, EventArgs e)
  
      {
  
          getCamList();
  
      }
  
  
  
      private void start_Click(object sender, EventArgs e)
  
      {
  
          if (start.Text == "&Start")
  
          {
  
              if (DeviceExist)
  
              {
  
                  videoSource = new VideoCaptureDevice(videoDevices[comboBox1.SelectedIndex].MonikerString);
  
                  videoSource.NewFrame += new NewFrameEventHandler(video_NewFrame);
  
                  videoSource.NewFrame += new NewFrameEventHandler(video_NewFrameSave);
  
                  CloseVideoSource();
  
                  videoSource.DesiredFrameSize = new Size(160, 120);
  
                  //videoSource.DesiredFrameRate = 10;
  
                  videoSource.Start();
  
                  label2.Text = "Device running...";
  
                  start.Text = "&Stop";
  
                  timer1.Enabled = true;
  
              }
  
              else
  
              {
  
                  label2.Text = "Error: No Device selected.";
  
              }
  
          }
  
          else
  
          {
  
              if (videoSource.IsRunning)
  
              {
  
                  timer1.Enabled = false;
  
                  CloseVideoSource();
  
                  label2.Text = "Device stopped.";
  
                  start.Text = "&Start";                    
  
              }
  
          }
  
      }
  
      private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          Bitmap img = (Bitmap)eventArgs.Frame.Clone();
  
          pictureBox1.Image = img;
  
      }
  
  
  
      Bitmap imgsave;
  
      private void video_NewFrameSave(object sender, NewFrameEventArgs eventArgs)
  
      {
  
          imgsave = (Bitmap)eventArgs.Frame.Clone();
  
      }
  
  
  
      private void CloseVideoSource()
  
      {
  
          if (!(videoSource == null))
  
              if (videoSource.IsRunning)
  
              {
  
                  videoSource.SignalToStop();
  
                  videoSource = null;
  
              }
  
      }
  
  
  
      private void timer1_Tick(object sender, EventArgs e)
  
      {
  
          label2.Text = "Device running... " + videoSource.FramesReceived.ToString() + " FPS";
  
      }
  
  
  
      private void Form1_FormClosed(object sender, FormClosedEventArgs e)
  
      {
  
          CloseVideoSource();
  
      }
  
  
  
      private void Form1_Load(object sender, EventArgs e)
  
      {
  
  
  
      }
  
  
  
      VideoFileWriter writer;
  
  
  
      private void button1_Click(object sender, EventArgs e)
  
      {
  
          int width = 640;
  
          int height = 480;
  
          writer = new VideoFileWriter();
  
          writer.Open("test.avi", width, height, 75, VideoCodec.MPEG4);
  
          for (int i = 0; i < 5000; i++)
  
          {
  
              writer.WriteVideoFrame(imgsave);
  
          }
  
  
  
      }
  
  
  
      private void button2_Click(object sender, EventArgs e)
  
      {
  
          writer.Close();
  
      }
  
  
  
  }
  
  }

  Thanks in advance.