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• Why does ffmpeg report different durations ?

  18 mai 2012, par kenitech

  Source videos : http://www.artworknotavailable.com/tmp/ffmpegtest

  Quicktime Pro 7.7.1 Inspector (Win 7) reports the following for the file 2398.mov

  4.19MB
  H.264
  Movie FPS : 23.98
  Data Rate : 2.35 mbits/Sec
  Duration 14:97
  

  ffmpeg reports the following (see full ffmpeg version info at bottom of post)

  ffmpeg -i 2398.mov

  Seems stream 1 codec frame rate differs from container frame rate : 47952.00 (47952/1) -> >23.98 (2997/125)
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '2398.mov' :
  Metadata :
  major_brand : qt
  

  minor_version : 537199360
  compatible_brands : qt
  Duration : 00:00:15.97, start : 0.-963005, bitrate : 2210 kb/s
  Stream #0.0(eng) : Audio : aac, 48000 Hz, stereo, s16, 152 kb/s
  Stream #0.1(eng) : Video : h264, yuv420p, 848x480, 2060 kb/s, 23.98 fps, 23.98 tbr, 23976 tbn, 47952 tbc
  

  One second longer than what Quicktime reports.

  As an experiment I exported this file from Quicktime Pro using the following settings :

  Frame Rate : Current
  Key Frames : Every 24 frames
  Frame Reordering On
  Quality : High
  Encoding Best
  Data Rate : Automatic
  Optimized for Download
  Output file : qtime-export-2398.mov

  Quicktime Inspector reports :

  5.62 MB
  H.264
  Movie FPS : 23.98
  Data Rate : 3.15 mbits/Sec
  Duration 14:97
  

  ffmpeg now reports :

  ffmpeg -i qtime-export-2398.mov

  Seems stream 1 codec frame rate differs from container frame rate : 1200.00 (1200/1) -> 23.98 (24000/1001)
  Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'qtime-export-2398.mov' :
  Metadata :
  major_brand : qt
  minor_version : 537199360
  compatible_brands : qt
  Duration : 00:00:14.96, start : 0.000000, bitrate : 3153 kb/s
  Stream #0.0(eng) : Audio : pcm_s16le, 44100 Hz, 2 channels, s16, 1411 kb/s
  Stream #0.1(eng) : Video : h264, yuv420p, 678x384, 1738 kb/s, 23.98 fps, 23.98 tbr, 600 tbn, 1200 tbc
  

  ffmpeg's report on duration went from 15.97 to 14.96 (I can live with .1)

  Is this duration calculated from the bitrate ?

  I need to accurately report the duration of uploaded videos as well as convert them to FLV. Can somebody tell me what is going on here and how I might get around this ?

  ffmpeg info below. I've tried this on 2 completely different installs/versions of ffmpeg. Same result.

  FFmpeg version 0.6.5, Copyright (c) 2000-2010 the FFmpeg developers
  built on Jan 29 2012 23:55:02 with gcc 4.1.2 20080704 (Red Hat 4.1.2-51)
  configuration : —prefix=/usr —libdir=/usr/lib64 —shlibdir=/usr/lib64 —mandir=/usr/share/man —incdir=/usr/include —disable-avisynth —extra-cflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector —param=ssp-buffer-size=4 -m64 -mtune=generic -fPIC' —enable-avfilter —enable-avfilter-lavf —enable-libdirac —enable-libfaac —enable-libfaad —enable-libfaadbin —enable-libgsm —enable-libmp3lame —enable-libopencore-amrnb —enable-libopencore-amrwb —enable-libx264 —enable-gpl —enable-nonfree —enable-postproc —enable-pthreads —enable-shared —enable-swscale —enable-vdpau —enable-version3 —enable-x11grab
  libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0
  FFmpeg 0.6.5
  libavutil 50.15. 1 / 50.15. 1
  libavcodec 52.72. 2 / 52.72. 2
  libavformat 52.64. 2 / 52.64. 2
  libavdevice 52. 2. 0 / 52. 2. 0
  libavfilter 1.19. 0 / 1.19. 0
  libswscale 0.11. 0 / 0.11. 0
  libpostproc 51. 2. 0 / 51. 2. 0

• Create stopmotion video with ffmpeg - error while rendering

  30 mai 2012, par Niklas

  I'm currently creating a stopmotion video with the help of ffmpeg and some scripts I've made. Although in the last clip I attempted to render I had a couple of frames which I've edited. The method I'm using has worked before so I'm certain that it has to do with GIMP changing something with the files. I work with .png-images. This is the command and the output I get :

  ffmpeg -sameq -f image2 -r 7 -i "$src_dir/frame-%06d.png" -r 25 "$dest_dir/$file_name.avi"

  output :

  ffmpeg version 0.8.1-4:0.8.1-0ubuntu1, Copyright (c) 2000-2011 the Libav developers
  
    built on Mar 22 2012 05:09:06 with gcc 4.6.3
  
  This program is not developed anymore and is only provided for compatibility. Use avconv instead (see Changelog for the list of incompatible changes).
  
  Input #0, image2, from '/mnt/storage/selected_frames/005-Middag-Animation/frame-%06d.png':
  
    Duration: 00:00:02.85, start: 0.000000, bitrate: N/A
  
      Stream #0.0: Video: png, bgra, 1280x720, 7 fps, 7 tbr, 7 tbn, 7 tbc
  
  File '/mnt/storage/Videoklipp//005-Middag-Animation.avi' already exists. Overwrite ? [y/N] y
  
  Incompatible pixel format 'bgra' for codec 'mpeg4', auto-selecting format 'yuv420p'
  
  [buffer @ 0x1b88860] w:1280 h:720 pixfmt:bgra
  
  [avsink @ 0x1b8a480] auto-inserting filter 'auto-inserted scaler 0' between the filter 'src' and the filter 'out'
  
  [scale @ 0x1b8ab80] w:1280 h:720 fmt:bgra -> w:1280 h:720 fmt:yuv420p flags:0x4
  
  Output #0, avi, to '/mnt/storage/Videoklipp//005-Middag-Animation.avi':
  
    Metadata:
  
      ISFT            : Lavf53.21.0
  
      Stream #0.0: Video: mpeg4, yuv420p, 1280x720, q=2-31, 2 kb/s, 25 tbn, 25 tbc
  
  Stream mapping:
  
    Stream #0.0 -> #0.0
  
  Press ctrl-c to stop encoding
  
  [buffer @ 0x1b88860] Changing frame properties on the fly is not supported.
  
      Last message repeated 6 times
  
  frame=   13 fps=  0 q=0.0 Lsize=     524kB time=2.20 bitrate=1951.2kbits/s    
  
  video:517kB audio:0kB global headers:0kB muxing overhead 1.323318%

  "[buffer @ 0x1b88860] Changing frame properties on the fly is not supported"

  What can I do to fix this ? Any help is appreciated :)

• FFmpeg - feed raw frames via pipe - FFmpeg does not detect pipe closure

  8 septembre 2018, par Rumble

  Im trying to follow these examples from C++ in Windows. Phyton Example C# Example

  I have an application that produces raw frames that shall be encoded with FFmpeg.
  The raw frames are transfered via IPC pipe to FFmpegs STDIN. That is working as expected, FFmpeg even displays the number of frames currently available.

  The problem occours when we are done sending frames. When I close the write end of the pipe I would expect FFmpeg to detect that, finish up and output the video. But that does not happen. FFmpeg stays open and seems to wait for more data.

  I made a small test project in VisualStudio.

  #include "stdafx.h" 
  
  //// stdafx.h 
  
  //#include "targetver.h"
  
  //#include 
  
  //#include 
  
  //#include <iostream>
  
  
  
  #include "Windows.h"
  
  #include <cstdlib>
  
  
  
  using namespace std;
  
  
  
  bool WritePipe(void* WritePipe, const UINT8 *const Buffer, const UINT32 Length)
  
  {
  
      if (WritePipe == nullptr || Buffer == nullptr || Length == 0)
  
      {
  
          cout &lt;&lt; __FUNCTION__ &lt;&lt; ": Some input is useless";
  
          return false;
  
      }
  
  
  
      // Write to pipe
  
      UINT32 BytesWritten = 0;
  
      UINT8 newline = '\n';
  
      bool bIsWritten = WriteFile(WritePipe, Buffer, Length, (::DWORD*)&amp;BytesWritten, nullptr);
  
      cout &lt;&lt; __FUNCTION__ &lt;&lt; " Bytes written to pipe " &lt;&lt; BytesWritten &lt;&lt; endl;
  
      //bIsWritten = WriteFile(WritePipe, &amp;newline, 1, (::DWORD*)&amp;BytesWritten, nullptr); // Do we need this? Actually this should destroy the image.
  
  
  
      FlushFileBuffers(WritePipe); // Do we need this?
  
  
  
      return bIsWritten;
  
  }
  
  
  
  #define PIXEL 80 // must be multiple of 8. Otherwise we get warning: Bytes are not aligned
  
  
  
  int main()
  
  {
  
      HANDLE PipeWriteEnd = nullptr;
  
      HANDLE PipeReadEnd = nullptr;
  
      {
  
          // create us a pipe for inter process communication
  
          SECURITY_ATTRIBUTES Attr = { sizeof(SECURITY_ATTRIBUTES), NULL, true };
  
          if (!CreatePipe(&amp;PipeReadEnd, &amp;PipeWriteEnd, &amp;Attr, 0))
  
          {
  
              cout &lt;&lt; "Could not create pipes" &lt;&lt; ::GetLastError() &lt;&lt; endl;
  
              system("Pause");
  
              return 0;
  
          }
  
      }
  
  
  
      // Setup the variables needed for CreateProcess
  
      // initialize process attributes
  
      SECURITY_ATTRIBUTES Attr;
  
      Attr.nLength = sizeof(SECURITY_ATTRIBUTES);
  
      Attr.lpSecurityDescriptor = NULL;
  
      Attr.bInheritHandle = true;
  
  
  
      // initialize process creation flags
  
      UINT32 CreateFlags = NORMAL_PRIORITY_CLASS;
  
      CreateFlags |= CREATE_NEW_CONSOLE;
  
  
  
      // initialize window flags
  
      UINT32 dwFlags = 0;
  
      UINT16 ShowWindowFlags = SW_HIDE;
  
  
  
      if (PipeWriteEnd != nullptr || PipeReadEnd != nullptr)
  
      {
  
          dwFlags |= STARTF_USESTDHANDLES;
  
      }
  
  
  
      // initialize startup info
  
      STARTUPINFOA StartupInfo = {
  
          sizeof(STARTUPINFO),
  
          NULL, NULL, NULL,
  
          (::DWORD)CW_USEDEFAULT,
  
          (::DWORD)CW_USEDEFAULT,
  
          (::DWORD)CW_USEDEFAULT,
  
          (::DWORD)CW_USEDEFAULT,
  
          (::DWORD)0, (::DWORD)0, (::DWORD)0,
  
          (::DWORD)dwFlags,
  
          ShowWindowFlags,
  
          0, NULL,
  
          HANDLE(PipeReadEnd),
  
          HANDLE(nullptr),
  
          HANDLE(nullptr)
  
      };
  
  
  
      LPSTR ffmpegURL = "\"PATHTOFFMPEGEXE\" -y -loglevel verbose -f rawvideo -vcodec rawvideo -framerate 1 -video_size 80x80 -pixel_format rgb24 -i - -vcodec mjpeg -framerate 1/4 -an \"OUTPUTDIRECTORY\"";
  
  
  
      // Finally create the process
  
      PROCESS_INFORMATION ProcInfo;
  
      if (!CreateProcessA(NULL, ffmpegURL, &amp;Attr, &amp;Attr, true, (::DWORD)CreateFlags, NULL, NULL, &amp;StartupInfo, &amp;ProcInfo))
  
      {
  
          cout &lt;&lt; "CreateProcess failed " &lt;&lt; ::GetLastError() &lt;&lt; endl;
  
      }
  
      //CloseHandle(ProcInfo.hThread);
  
  
  
  
  
          // Create images and write to pipe
  
  #define MYARRAYSIZE (PIXEL*PIXEL*3) // each pixel has 3 bytes
  
  
  
      UINT8* Bitmap = new UINT8[MYARRAYSIZE];
  
  
  
      for (INT32 outerLoopIndex = 9; outerLoopIndex >= 0; --outerLoopIndex)   // frame loop
  
      {
  
          for (INT32 innerLoopIndex = MYARRAYSIZE - 1; innerLoopIndex >= 0; --innerLoopIndex) // create the pixels for each frame
  
          {
  
              Bitmap[innerLoopIndex] = (UINT8)(outerLoopIndex * 20); // some gray color
  
          }
  
          system("pause");
  
          if (!WritePipe(PipeWriteEnd, Bitmap, MYARRAYSIZE))
  
          {
  
              cout &lt;&lt; "Failed writing to pipe" &lt;&lt; endl;
  
          }
  
      }
  
  
  
      // Done sending images. Tell the other process. IS THIS NEEDED? HOW TO TELL FFmpeg WE ARE DONE?
  
      //UINT8 endOfFile = 0xFF; // EOF = -1 == 1111 1111 for uint8
  
      //if (!WritePipe(PipeWriteEnd, &amp;endOfFile, 1))
  
      //{
  
      //  cout &lt;&lt; "Failed writing to pipe" &lt;&lt; endl;
  
      //}
  
      //FlushFileBuffers(PipeReadEnd); // Do we need this?
  
  
  
      delete Bitmap;
  
  
  
  
  
      system("pause");
  
  
  
      // clean stuff up
  
      FlushFileBuffers(PipeWriteEnd); // Do we need this?
  
  
  
      if (PipeWriteEnd != NULL &amp;&amp; PipeWriteEnd != INVALID_HANDLE_VALUE)
  
      {
  
          CloseHandle(PipeWriteEnd);
  
      }
  
  
  
      // We do not want to destroy the read end of the pipe? Should not as that belongs to FFmpeg
  
      //if (PipeReadEnd != NULL &amp;&amp; PipeReadEnd != INVALID_HANDLE_VALUE)
  
      //{
  
      //  ::CloseHandle(PipeReadEnd);
  
      //}
  
  
  
  
  
      return 0;
  
  
  
  }
  
  </cstdlib></iostream>

  And here the output of FFmpeg

  ffmpeg version 3.4.1 Copyright (c) 2000-2017 the FFmpeg developers
  
    built with gcc 7.2.0 (GCC)
  
    configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-bzlib --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-cuda --enable-cuvid --enable-d3d11va --enable-nvenc --enable-dxva2 --enable-avisynth --enable-libmfx
  
    libavutil      55. 78.100 / 55. 78.100
  
    libavcodec     57.107.100 / 57.107.100
  
    libavformat    57. 83.100 / 57. 83.100
  
    libavdevice    57. 10.100 / 57. 10.100
  
    libavfilter     6.107.100 /  6.107.100
  
    libswscale      4.  8.100 /  4.  8.100
  
    libswresample   2.  9.100 /  2.  9.100
  
    libpostproc    54.  7.100 / 54.  7.100
  
  [rawvideo @ 00000221ff992120] max_analyze_duration 5000000 reached at 5000000 microseconds st:0
  
  Input #0, rawvideo, from 'pipe:':
  
    Duration: N/A, start: 0.000000, bitrate: 153 kb/s
  
      Stream #0:0: Video: rawvideo, 1 reference frame (RGB[24] / 0x18424752), rgb24, 80x80, 153 kb/s, 1 fps, 1 tbr, 1 tbn, 1 tbc
  
  Stream mapping:
  
    Stream #0:0 -> #0:0 (rawvideo (native) -> mjpeg (native))
  
  [graph 0 input from stream 0:0 @ 00000221ff999c20] w:80 h:80 pixfmt:rgb24 tb:1/1 fr:1/1 sar:0/1 sws_param:flags=2
  
  [auto_scaler_0 @ 00000221ffa071a0] w:iw h:ih flags:'bicubic' interl:0
  
  [format @ 00000221ffa04e20] auto-inserting filter 'auto_scaler_0' between the filter 'Parsed_null_0' and the filter 'format'
  
  [swscaler @ 00000221ffa0a780] deprecated pixel format used, make sure you did set range correctly
  
  [auto_scaler_0 @ 00000221ffa071a0] w:80 h:80 fmt:rgb24 sar:0/1 -> w:80 h:80 fmt:yuvj444p sar:0/1 flags:0x4
  
  Output #0, mp4, to 'c:/users/vr3/Documents/Guenni/sometest.mp4':
  
    Metadata:
  
      encoder         : Lavf57.83.100
  
      Stream #0:0: Video: mjpeg, 1 reference frame (mp4v / 0x7634706D), yuvj444p(pc), 80x80, q=2-31, 200 kb/s, 1 fps, 16384 tbn, 1 tbc
  
      Metadata:
  
        encoder         : Lavc57.107.100 mjpeg
  
      Side data:
  
        cpb: bitrate max/min/avg: 0/0/200000 buffer size: 0 vbv_delay: -1
  
  frame=   10 fps=6.3 q=1.6 size=       0kB time=00:00:09.00 bitrate=   0.0kbits/s speed=5.63x

  As you can see in the last line of te FFmpeg output, the images got trough. 10 frames are available. But after closing the pipe, FFmpeg does not close, still expecting input.

  As the linked examples show, this should be a valid method.

  Trying for a week now...