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• Why when using ffmpeg to create in real time avi video file from images the avi file is playing with purple noisy color ?

  30 juin 2015, par Brubaker Haim

  This is my Ffmpeg class i did some time ago

  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
  
  {
  
      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();
  
          }
  
      }
  
  }

  And i’m using it in form1 in a button click event :

  private void button1_Click(object sender, EventArgs e)
  
          {
  
              timer1.Start();
  
          }

  the directroy screenshots is where i’m taking a screenshot every 100ms in the timer1 tick event :

      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();
  
          }
  
      }

  I’m calling the method PushFrame from inside the ScreenShot class where i save the screenshots.

  Ffmpeg fmpeg;

  Then :

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

  And :

  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);
  
          fmpeg.PushFrame(_screenShot);
  
          _screenShot.Dispose();
  
  
  
          return _screenShot;
  
      }

  All the images on the hard disk are fine i can edit/open them and watch them no problems.
  They are also same size.

  The result in the end is one big avi file 1.08 GB size.
  But when i play it i see many windows running inside very fast and all painted with noisy purple color.

  Here a screenshot from the video file when playing it :

  avi file playing screenshot

  I think the problem is somewhere in the Ffmpeg class where i give parameters to the ffmpeg.exe

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

  Not sure what make this avi file to look like that.

  This is the video file the result i got : https://www.youtube.com/watch?v=fdxPus-Xv1k&feature=youtu.be

• How can I compress and create mp4 video file from batch of images on hard disk using ffmpeg ?

  29 juin 2015, par Brubaker Haim

  In my directory I copied ffmpeg.exe to the same directory where all the images are.
  All images are bitmaps.

  Then in the command prompt windows I typed :

  ffmpeg -f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i \\.\pipe\mytestpipe -map 0 -c:v mpeg4 -r  out.mp4

  But I get error that there is no a directory name :

  \.\pipe\mytestpipe

  So I removed it and typed the same line without the pipe part.

  ffmpeg -f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i -map 0 -c:v mpeg4 -r  out.mp4

  Now there is no a directory name -map

  So I moved the -map 0

  ffmpeg -f rawvideo -pix_fmt yuv420p -video_size 1920x1080 -i -c:v mpeg4 -r  out.mp4

  Now I’m getting error :

  -c:v : Protocol not found

  I used this line with the pipe in my c# program as arguments to ffmpeg using ProcessStartInfo but now I don’t want to use pipes only in the command prompt to type it and compress and create mp4 video file.

  Edit I tried this now :

  ffmpeg -framerate 1/5 -i screenshot%06d.bmp -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

  And what I get is some errors :

  E:\screenshots>ffmpeg -framerate 1/5 -i screenshot%06d.bmp -c:v libx264 -r 30 -p
  
  ix_fmt yuv420p out.mp4
  
  ffmpeg version N-73165-gf1e1730 Copyright (c) 2000-2015 the FFmpeg developers
  
    built with gcc 4.9.2 (GCC)
  
    configuration: --enable-gpl --enable-version3 --disable-w32threads --enable-av
  
  isynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enab
  
  le-iconv --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca --
  
  enable-libdcadec --enable-libfreetype --enable-libgme --enable-libgsm --enable-l
  
  ibilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enab
  
  le-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --en
  
  able-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --ena
  
  ble-libtwolame --enable-libvidstab --enable-libvo-aacenc --enable-libvo-amrwbenc
  
   --enable-libvorbis --enable-libvpx --enable-libwavpack --enable-libwebp --enabl
  
  e-libx264 --enable-libx265 --enable-libxavs --enable-libxvid --enable-lzma --ena
  
  ble-decklink --enable-zlib
  
    libavutil      54. 27.100 / 54. 27.100
  
    libavcodec     56. 45.100 / 56. 45.100
  
    libavformat    56. 38.102 / 56. 38.102
  
    libavdevice    56.  4.100 / 56.  4.100
  
    libavfilter     5. 18.100 /  5. 18.100
  
    libswscale      3.  1.101 /  3.  1.101
  
    libswresample   1.  2.100 /  1.  2.100
  
    libpostproc    53.  3.100 / 53.  3.100
  
  [bmp @ 0000000002eb7f80] bad magic number
  
      Last message repeated 2 times
  
  [image2 @ 0000000002eb64e0] decoding for stream 0 failed
  
  [image2 @ 0000000002eb64e0] Could not find codec parameters for stream 0 (Video:
  
   bmp, none): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  screenshot%06d.bmp: could not find codec parameters
  
  Input #0, image2, from 'screenshot%06d.bmp':
  
    Duration: 00:07:35.00, start: 0.000000, bitrate: N/A
  
      Stream #0:0: Video: bmp, none, 0.20 fps, 0.20 tbr, 0.20 tbn, 0.20 tbc
  
  Output #0, mp4, to 'out.mp4':
  
  Output file #0 does not contain any stream

  For those who can see. When i’m doing it on a single file for example : ffmpeg -framerate 1/5 -i screenshot000002.bmp -c:v libx264 -r 30 -pix_fmt yuv420p out1.mp4 or screenshot000003.bmp or screenshot000122.bmp it will work fine and create the video file. But when i’m doing this for all images i’m getting all the errors : ffmpeg -framerate 1/5 -i screenshot%06d.bmp -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4 here is the results when i did on screenshot000002.bmp and it worked fine.

  When i’m doing it on a single image file it’s working fine like screenshot000002.bmp but when doing it on all the images screenshot%06d.bmp it’s giving me all the errors i mentioned above.

• Why seek on ts file is so slow ?

  2 juillet 2015, par skipper

  I am dealing with a ts file, following is ffprobe output :

  ffprobe version N-45589-gb6a0b8b-   http://johnvansickle.com/ffmpeg/    Copyright (c) 2007-2014 the FFmpeg developers
  
    built on Aug 28 2014 02:30:32 with gcc 4.8 (Debian 4.8.3-9)
  
    configuration: --enable-gpl --enable-version3 --disable-shared --disable-debug --enable-runtime-cpudetect --enable-libmp3lame --enable-libx264 --enable-libx265 --enable-libwebp --enable-libspeex --enable-libvorbis --enable-libvpx --enable-libfreetype --enable-fontconfig --enable-libxvid --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libtheora --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-gray --enable-libopenjpeg --enable-libopus --disable-ffserver --enable-libass --enable-gnutls --cc=gcc-4.8
  
    libavutil      54.  7.100 / 54.  7.100
  
    libavcodec     56.  0.101 / 56.  0.101
  
    libavformat    56.  3.100 / 56.  3.100
  
    libavdevice    56.  0.100 / 56.  0.100
  
    libavfilter     5.  0.103 /  5.  0.103
  
    libswscale      3.  0.100 /  3.  0.100
  
    libswresample   1.  1.100 /  1.  1.100
  
    libpostproc    53.  0.100 / 53.  0.100
  
  [hevc @ 0x298b4a0] No start code is found.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] No start code is found.
  
      Last message repeated 2 times
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] No start code is found.
  
      Last message repeated 7 times
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] No start code is found.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [hevc @ 0x298b4a0] PPS id out of range: 0
  
  [hevc @ 0x298b4a0] Error parsing NAL unit #2.
  
  [mpegts @ 0x2987560] decoding for stream 0 failed
  
  [mpegts @ 0x2987560] Could not find codec parameters for stream 0 (Video: hevc ([36][0][0][0] / 0x0024)): unspecified size
  
  Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Input #0, mpegts, from 'mp4box-jlsj-4k.ts':
  
    Duration: 00:02:15.00, start: 0.001111, bitrate: 31116 kb/s
  
    Program 1
  
      Stream #0:0[0x65]: Video: hevc ([36][0][0][0] / 0x0024), 25 tbr, 90k tbn, 90k tbc
  
      Stream #0:1[0x66]: Audio: eac3, 48000 Hz, 5.1(side), fltp, 448 kb/s

  The problem I’m having is that seeking on this file is extremely slow, it took more than 1 minute to complete seek operation.

  This ts file is 500MB in size, has 2,793,052 ts packets, 2,750,469 video packets, 137 video packets with random_acces_indicator.
  What’s the possible reason for the slow seek ? Why is ffmpeg reporting these errors ? What do I need to do for the analysis ?