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• Increase fps in record video ffmpeg

  16 juin 2017, par Badfishmaan

  I need to record 2 videos from 2 cameras in full hd 30 fps.
  I use ffmpeg and wrapper - Aforge for c#.

  init device :

          _videoCaptureDevice = new VideoCaptureDevice(deviceName);
  
          _videoCaptureDevice.VideoResolution = _videoCaptureDevice.VideoCapabilities[0];
  
          _videoCaptureDevice.DesiredFrameRate = _fps;
  
          _videoSourcePlayer.VideoSource = _videoCaptureDevice;
  
          _videoCaptureDevice.NewFrame += _videoCaptureDevice_NewFrame;
  
          _videoSourcePlayer.Start();

  saving frames

          if (_videoRecordStatus == VideoRecordStatus.Recording)
  
          {
  
              _videoFileWriter.WriteVideoFrame(eventArgs.Frame);
  
          }

  and init file writer

              _videoFileWriter = new VideoFileWriter();
  
              _videoFileWriter.Open(_fileName, _videoCaptureDevice.VideoResolution.FrameSize.Width,
  
                  _videoCaptureDevice.VideoResolution.FrameSize.Height, 30, VideoCodec.MPEG4, 10 * 1000 * 1000);

  now _videoCaptureDevice.VideoResolution.FrameSize equals 1280x720 and 640x480 (for second device). But I already have problems with recording. Maximum fps is 24 for 480p and 13-14 for 720p (when I try to record videos from 2 cameras in the same time)

  How to increase it ?
  Or it isn’t possible ? Maybe more powerfull computer will solve this problem (I have Pentium(R) Dual-Core CPU 2.50Ghz and usual videocart (Geforse 8500 GT) for working with two displays, usual hdd, usb 2.0) ?

  I will glad any help (maybe another library, but not language (c#))

  PS
  I already used Emgu.CV and faced with simular problems..

• Record video with Accord.net (AForge)

  26 novembre 2020, par ghasem deh

  I used Accord.net (AForge) for connect to the webcam and record video
But stored videos is slow motion ...
this my project :

  



      using AForge.Video;
using AForge.Video.DirectShow;
using AForge.Video.FFMPEG;
using System;
using System.Drawing;
using System.IO;
using System.Threading;
using System.Windows.Forms;

namespace CaptureWebcam
{
    public partial class Form1 : Form
    {
        private VideoCaptureDeviceForm captureDevice;
        private string path = Path.GetDirectoryName(Application.ExecutablePath) + @"\Videos\";
        private FilterInfoCollection videoDevice;
        private VideoCaptureDevice videoSource;
        private VideoFileWriter FileWriter = new VideoFileWriter();
        private Bitmap video;
        bool isRecord = false;

        public Form1()
        {
            InitializeComponent();
        }

        private void videoSource_NewFrame(object sender, NewFrameEventArgs eventArgs)
        {
            video = (Bitmap)eventArgs.Frame.Clone();
            pictureBox1.Image = (Bitmap)eventArgs.Frame.Clone();
        }

        private void btnStartCam_Click(object sender, EventArgs e)
        {
            videoDevice = new FilterInfoCollection(FilterCategory.VideoInputDevice);
            captureDevice = new VideoCaptureDeviceForm();
            if (captureDevice.ShowDialog(this) == DialogResult.OK)
            {
                videoSource = captureDevice.VideoDevice;
                videoSource = captureDevice.VideoDevice;
                videoSource.NewFrame += new NewFrameEventHandler(videoSource_NewFrame);
                videoSource.Start();
                timer1.Enabled = true;
            }
            //videoSource.DisplayPropertyPage(IntPtr.Zero);
        }

        private Thread workerThread = null;
        private bool stopProcess = false;

        private void recordLiveCam()
        {
            if (!stopProcess)
            {
                while (isRecord)
                {
                    FileWriter.WriteVideoFrame(video);
                }
                FileWriter.Close();
            }
            else
            {
                workerThread.Abort();
            }            
        }

        private void btnRecord_Click(object sender, EventArgs e)
        {
            //try
            //{
            isRecord = true;
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }
            int h = captureDevice.VideoDevice.VideoResolution.FrameSize.Height;
            int w = captureDevice.VideoDevice.VideoResolution.FrameSize.Width;
            FileWriter.Open(path + "recorded at " + DateTime.Now.ToString("HH-mm-ss") + ".mp4", w, h, 25, VideoCodec.MPEG4);
            stopProcess = false;
            workerThread = new Thread(new ThreadStart(recordLiveCam));
            workerThread.Start();

            //}
            //catch (Exception ex)
            //{
            //    MessageBox.Show(ex.Message);
            //}
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void btnStopRecord_Click(object sender, EventArgs e)
        {
            stopProcess = true;
            isRecord = false;
            FileWriter.Close();
            workerThread.Abort();
            video = null;

        }

        private void btnStopCam_Click(object sender, EventArgs e)
        {
            try
            {
                if (videoSource.IsRunning)
                {
                    videoSource.SignalToStop();
                    videoSource.Stop();                  
                    pictureBox1.Image = null;
                    pictureBox1.Invalidate();
                    if (FileWriter.IsOpen)
                    {
                        FileWriter.Close();
                        video = null;
                    }
                }
                else
                    return;
            }
            catch
            {
                videoSource.Stop();
                FileWriter.Close();
                video = null;
            }
        }

        float fts = 0.0f;
        private void timer1_Tick(object sender, EventArgs e)
        {
            fts = videoSource.FramesReceived;
            label1.Text = "Frame Rate : " + fts.ToString("F2") + " fps";
        }
    }
}


  



  And when click the btnStopRecord following error :

  



  


  Additional information : Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

  


  


• How can I record an audio from USB audio device using C++ with ffmpeg on Linux ?

  9 mai 2018, par Hunter Haimin Zhang

  How can I record an audio from USB audio device using C++ with ffmpeg on Linux ?
  I have the following code. But I have no idea how to set the parameter of ’url’ in the function of avformat_open_input.
  Could assistance be provided by anybody ? Much appreciated.

     27     av_register_all();
  
     28     avdevice_register_all();
  
     29
  
     30     //pAudioInputFmt =av_find_input_format("dshow");
  
     31     pAudioInputFmt =av_find_input_format("alsa");
  
     32     //assert(pAudioInputFmt != NULL);
  
     33     if (!(pAudioInputFmt != NULL))
  
     34     {
  
     35         printf("Error %s %d\n", __FILE__, __LINE__);
  
     36         char ch = cin.get();
  
     37         cout << "ch = "<< ch << endl;
  
     38         return (-1);
  
     39     }
  
     40
  
     41     // I have no idear how to set the second parameter on Linux.
  
     42     if (!(avformat_open_input(&pFmtCtx, "=Device)", pAudioInputFmt,NULL) == 0))
  
     43     {
  
     44         printf("Error %s %d\n", __FILE__, __LINE__);
  
     45         system("pause");
  
     46         return (-1);
  
     47     }