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• Why when using ffmpeg to create video file in real time the ffmpeg.exe take over 1GB of memory ?

  3 juillet 2015, par Brubaker Haim

  This is my class where i’m using the ffmpeg.exe.

  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;
  
  using DannyGeneral;
  
  
  
  namespace Manager
  
  {
  
      public 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 bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -c:v libx264 -crf 20 -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();
  
          }
  
      }
  
  }

  ffmpegFileName contain the ffmpeg.exe

  Then i have a timer tick event in another form :

  ScreenShot shot = new ScreenShot();
  
      public static int counter = 0;
  
      private void timer1_Tick(object sender, EventArgs e)
  
      {
  
          counter++;
  
          shot.GetScreenShot(@"e:\screenshots\", "screenshot");
  
          if (counter == 1200)
  
          {
  
              timer1.Stop();
  
              ScreenShot.fmpeg.Close();
  
              this.Close();
  
              ScreenShotsPlayer ssp = new ScreenShotsPlayer();
  
              ssp.Show();
  
          }
  
      }

  This timer interval set to 100ms.
  So it’s taking a screenshot every 100ms.

  In the class ScreenShot i’m using the Ffmpeg class :
  In the top :

  public static Ffmpeg fmpeg;

  In the constructor :

  fmpeg = new Ffmpeg();
  
  fmpeg.Start(@"e:\screenshots\test.mp4", 25);

  Then in the GetScreenShot method i’m calling the Ffmpeg PushFrame method :

  public Bitmap GetScreenShot(string folder, string name)
  
      {
  
          _screenShot = new Bitmap(GetScreen());
  
          System.GC.Collect();
  
          System.GC.WaitForPendingFinalizers();
  
          string ingName = folder + name + Elgato_Video_Capture.counter.ToString("D6") + ".bmp";
  
          _screenShot.Save(ingName,System.Drawing.Imaging.ImageFormat.Bmp);
  
          fmpeg.PushFrame(_screenShot);
  
          _screenShot.Dispose();
  
          return _screenShot;
  
      }

  I can’t figure out why once i start the timer to take the screenshots the ffmpeg.exe eat so much memory also the hard disk is working about 53MB/s and the memory is over 90% and over 1GB.

  I’m doing the memory leak somehow ?

  

  In the ScreenShot class when i’m making an instance once for the Ffmpeg class the ffmpeg.exe is on very low memory usage and the hard disk usage is low.

  The ffmpeg.exe is about only 0.1MB of memory usage.

  fmpeg.Start(@"e:\screenshots\test.mp4", 25);

  But then when i’m clicking the button start the timer and taking screenshots every 100ms and calling PushFrame method the ffmpeg.exe very fast after few seconds getting to over 1GB of memory usage.

  EDIT

  I tried this arguments :

  psi.Arguments = @"-f rawvideo -pix_fmt bgra -video_size 1920x1080 -i \\.\pipe\mytestpipe -c:v libx264 -crf 20 -r 750k e:\screenshots\test.mp4";

  The memory usage was about 1gb of ffmpeg.exe and cpu usage 99-100%
  The hard disk was on 0 but now the cpu usage got to 100% and the memory over 1gb.

  And it didn’t create the video file I got this warnings/errors :

  

• How to restore a recorded mkv video back to its original state [closed]

  5 avril 2023, par itpotatoes

  The mkv video recorded with the Kinect camera was converted to mp4 after converting the color, depth, and ir video to avi using mkvtoolnix.
When I try to convert this back to avi with ffmpeg, it says that the depth and ir images cannot contain rawvideo gray16be in the avi container. Does anyone know of another way ?

  


  I could change it to another codec, but I couldn't convert it to rawvideo gray16be format.

  


• How to edit Video metadata while in Binary State using Python

  16 juin 2021, par DeadUser

  I want to download a Video file from internet using requests library and before saving that endit metadata of the video.

  



  import requests

url = 'https://www.sample-videos.com/video123/mp4/720/big_buck_bunny_720p_5mb.mp4'

r = requests.get(url, stream=True)

with open('video.mp4', 'wb') as file:
     file.write(r.content)



  



  I just want to change the metadata to video before saving the file.