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• avformat_open_input causes exception on RTP stream open

  3 avril 2014, par user3283475

  I'm trying to program a video player of the RTP stream. I'm using visual studio 2010. When avformat_open_input command is executed an exception is generated (ntdll.dll !774b70f4()). It works fine with normal file from disk(test.avi).

  #include "stdafx.h"
  
  #include 
  
  
  
  //zeranoe headers and libraries(DLLs also from zeranoe)
  
  extern "C"
  
  {
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  }
  
  
  
  #pragma comment(lib, "avcodec.lib")
  
  #pragma comment(lib, "avformat.lib")
  
  
  
  int _tmain(int argc, _TCHAR* argv[])
  
  {
  
      AVFormatContext *pFormatCtx=NULL;
  
      //char* Filename="c:\\test.avi"; //if I use this there is no crash
  
      char* Filename="rtp://239.255.42.42:5004";//if I use rtp I receive exception
  
      int videoStream,i;
  
      AVCodec         *pCodec=NULL;
  
      AVCodecContext  *pCodecCtx=NULL;
  
  
  
      avcodec_register_all(); 
  
      av_register_all();
  
      avformat_network_init();
  
  
  
      unsigned int _expTime = 5000;
  
      static const AVIOInterruptCB int_cb = {interrupt_cb, &amp;_expTime};
  
  
  
  
  
      // Open video file
  
      if(avformat_open_input(&amp;pFormatCtx, Filename , NULL,NULL)!=0)//ntdll.dll exception when I try to open rtp stream
  
      return -1; // Couldn&#39;t open file

  Can someone help me please ?

• Extract frames from a large video c#

  21 janvier 2014, par las

  I am developing a video editing software.
  For that I need to first load a video for editing.
  After loading the video I need to create a timeline of the video with its Thumbnail images which should take in every one seconds.

  I have tried many options for that but still have an issue with more 10 - 15 mins videos.

  First I used ffmpeg.
  There I tired two options.They ended up with following results
   One is very slow
   Another one is fast but thumbnails are not accurate

  Next I used Aforge.Net
   There I can save images to disk but cannot access after 2000-3000 thumbnails
  (It gives out of memory exception)

  Please if you have good suggestion let me know for this task.
  Any one like to see my tried code samples let me know , I will add it to this question.

  Following is the method for reading images which are in the Disk

    void AddThumbnailImages(int i)
  
    {
  
  
  
       PictureBox pictureBox = new PictureBox();
  
       pictureBox.Size = new System.Drawing.Size(100, 75);
  
  
  
        pictureBox.Image = (Bitmap)new Bitmap("Snaps\\" + i + ".jpeg").Clone();
  
  
  
          if (i == totalFrames)
  
        { pictureBox.Tag = totalTimeForFrames; }
  
        else { pictureBox.Tag = (i / frameRate); }
  
        pictureBox.MouseClick += new MouseEventHandler(ViewImageTag);
  
        pictureBox.MouseDoubleClick += new MouseEventHandler(videoCuting);
  
        pictureBox.MouseHover += new EventHandler(pictureBox_MouseHover);
  
        pictureBox.SizeMode = PictureBoxSizeMode.Zoom;
  
        pictureBox.BringToFront();
  
  
  
       pictureBox.Location = new Point(pictureBoxlocationX + (100 * (i/frameRate)),         pictureBoxlocationY);
  
       panelTimeline.Controls.Add(pictureBox);
  
  
  
     }

• When using ffmpeg.exe to create video from sequence of images the result is avi file that show green color why ?

  9 janvier 2014, par user3163653

  In Form1 im taking screenshots of my screen I checked they are ok i save them to the hard disk and see they are ok.

  private void timer1_Tick(object sender, EventArgs e)
  
          {
  
  
  
              using (bitmap = (Bitmap)ScreenCapture.CaptureScreen(true))
  
              {
  
  
  
              Image mScreenImage = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
  
                                       Screen.PrimaryScreen.Bounds.Height);
  
              Graphics g = Graphics.FromImage(bitmap);
  
              g.CopyFromScreen(0, 0, 0, 0, new Size(bitmap.Width, bitmap.Height));
  
              g.Dispose();
  
                  bitmap.Save(@"D:\Testbmp\" + counter.ToString("D6") + ".jpg", ImageFormat.Jpeg);
  
                  counter++;
  
              ffmp.PushFrame((Bitmap)mScreenImage);
  
  
  
              }
  
  
  
          }

  Then in the new class ffmp im using pipe to get the screenshots and build the avi file in real time :

  using System;
  
  using System.Windows.Forms;
  
  using System.Collections.Generic;
  
  using System.Linq;
  
  using System.Text;
  
  using System.Threading.Tasks;
  
  using System.Drawing;
  
  using System.IO.Pipes;
  
  using System.Runtime.InteropServices;
  
  using System.Diagnostics;
  
  using System.IO;
  
  
  
  namespace ScreenVideoRecorder
  
  {
  
      class Ffmpeg
  
      {
  
          NamedPipeServerStream p;
  
          String pipename = "mytestpipe";
  
          System.Diagnostics.Process process;
  
          string ffmpegFileName = "ffmpeg.exe";
  
          string workingDirectory;
  
  
  
          public Ffmpeg()
  
          {
  
              workingDirectory = Path.GetDirectoryName(Application.ExecutablePath);
  
              Logger.Write("workingDirectory: " + workingDirectory);
  
              if (!Directory.Exists(workingDirectory))
  
              {
  
                  Directory.CreateDirectory(workingDirectory);
  
              }
  
              ffmpegFileName = Path.Combine(workingDirectory, ffmpegFileName);
  
              Logger.Write("FfmpegFilename: " + ffmpegFileName);
  
          }
  
  
  
          public void Start(string pathFileName, int BitmapRate)
  
          {
  
              try
  
              {
  
  
  
                  string outPath = pathFileName;
  
                  p = new NamedPipeServerStream(pipename, PipeDirection.Out, 1, PipeTransmissionMode.Byte);
  
  
  
                  ProcessStartInfo psi = new ProcessStartInfo();
  
                  psi.WindowStyle = ProcessWindowStyle.Hidden;
  
                  psi.UseShellExecute = false;
  
                  psi.CreateNoWindow = false;
  
                  psi.FileName = ffmpegFileName;
  
                  psi.WorkingDirectory = workingDirectory;
  
                  psi.Arguments = @"-f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;
  
                  process = Process.Start(psi);
  
                  process.EnableRaisingEvents = false;
  
                  psi.RedirectStandardError = true;
  
                  p.WaitForConnection();
  
              }
  
              catch (Exception err)
  
              {
  
                  Logger.Write("Exception Error: " + err.ToString());
  
              }
  
          }
  
  
  
          public void PushFrame(Bitmap bmp)
  
          {
  
              try
  
              {
  
                  int length;
  
                  // Lock the bitmap's bits.
  
                  //bmp = new Bitmap(1920, 1080);
  
                  Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
  
                  //Rectangle rect = new Rectangle(0, 0, 1280, 720);
  
                  System.Drawing.Imaging.BitmapData bmpData =
  
                      bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadOnly,
  
                      bmp.PixelFormat);
  
  
  
                  int absStride = Math.Abs(bmpData.Stride);
  
                  // Get the address of the first line.
  
                  IntPtr ptr = bmpData.Scan0;
  
  
  
                  // Declare an array to hold the bytes of the bitmap.
  
                  //length = 3 * bmp.Width * bmp.Height;
  
                  length = absStride * bmpData.Height;
  
                  byte[] rgbValues = new byte[length];
  
  
  
                  //Marshal.Copy(ptr, rgbValues, 0, length);
  
                  int j = bmp.Height - 1;
  
                  for (int i = 0; i < bmp.Height; i++)
  
                  {
  
                      IntPtr pointer = new IntPtr(bmpData.Scan0.ToInt32() + (bmpData.Stride * j));
  
                      System.Runtime.InteropServices.Marshal.Copy(pointer, rgbValues, absStride * (bmp.Height - i - 1), absStride);
  
                      j--;
  
                  }
  
                  p.Write(rgbValues, 0, length);
  
                  bmp.UnlockBits(bmpData);
  
              }
  
              catch(Exception err)
  
              {
  
                  Logger.Write("Error: " + err.ToString());
  
              }
  
  
  
          }
  
  
  
          public void Close()
  
          {
  
              p.Close();
  
          }
  
      }
  
  }

  This is the arguments im using now :

  psi.Arguments = @"-f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r " + BitmapRate + " " + outPath;

  Before that I tried to use libx264 instead the mpeg4 but it didn't create the avi file good.
  The problem is that the avi file on the hard disk when I play it show just green color.
  I can play any other avi files on my hard disk but when playing this avi file I see green.

  

  And this is what I see when im playing the avi file :

  

  I tried to use Gspot to find if I need any codec to install and this is what I see :

  

  And I have ffdshow installed already so what should I do now ?