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• Large Panorama to Panning Video

  16 juillet 2022, par COOKIES

  What would be the most efficient way to create a video from a panoramic image that would for example have the size : 5000 width x 600 height px ?

  



  I created this GIF image that would explain things a bit better. Imagine that the video would be inside the red border. So the video would potentially be panning from left to right.

  



  

  


• 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.

• 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 ?