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• ffmpeg failed to open h264 codec

  29 novembre 2015, par Joseph

  I’m trying to extract frames from an existed video (h264), using the ffmpeg library.
  When use an avi video file (with mjpeg - motion jpeg codec), all works fine.
  (m_formatCtx->iformat = av_find_input_format("mjpeg") ;)

  When run on the mp4 with h264 codec, we get the following errors, and no luck !!
  We fail when try to retrieve stream information by calling :
  avformat_find_stream_info(m_formatCtx, NULL) ;

  The log :

  [h264 @ 02023460] non-existing PPS 1 referenced
  
  [h264 @ 02023460] non-existing PPS 1 referenced
  
  [h264 @ 02023460] decode_slice_header error
  
  [h264 @ 02023460] non-existing PPS 6 referenced
  
  [h264 @ 02023460] decode_slice_header error
  
  [h264 @ 02023460] no frame!
  
  [h264 @ 0201a880] decoding for stream 0 failed
  
  [h264 @ 0201a880] Could not find codec parameters for stream 0 (Video: h264): unspecified size Consider increasing the value for the 'analyzeduration' and 'probesize' options
  
  Could not find stream information

  Any idea ?

  the Code :

  We call

  CVideoReader::Open (file name , PRESET_MJPEG_CLOCKLESS_STREAM,
  IMAGE_FORMAT_RGB1)

  see below :

  bool CVideoReader::InitFormat(std::string _filepath)
  
  {
  
      m_formatCtx = avformat_alloc_context(); 
  
      m_formatCtx->iformat = NULL;
  
  
  
      if(m_videoPreset == PRESET_MJPEG_CLOCKLESS_STREAM)
  
      {
  
          m_formatCtx->iformat = av_find_input_format("h264");
  
         // Get timestamp from clock on arrival
  
          m_formatCtx->use_wallclock_as_timestamps = true;
  
      }
  
  
  
      int ret;
  
      // open input file, and allocate format context
  
      if ((ret = avformat_open_input(&m_formatCtx, _filepath.c_str(), m_formatCtx->iformat, NULL)) < 0) 
  
      {
  
          std::cerr << "Could not open source file" << std::endl;
  
          return false;
  
      }
  
  
  
      // retrieve stream information
  
      ret = avformat_find_stream_info(m_formatCtx, NULL);
  
      if (ret < 0) 
  
      {
  
          std::cerr << "Could not find stream information" << std::endl;
  
          return false;
  
      }
  
  
  
      m_videoStream = m_formatCtx->streams[0];
  
  
  
      av_dump_format(m_formatCtx, 0, _filepath.c_str(), 0);
  
      return true;
  
  }
  
  void CVideoReader::Open( char * _filepath, EVideoPreset _videoFormat, EImageFormat _imageDecodingFormat)
  
  {
  
      m_videoPreset = _videoFormat;
  
      if(!InitFormat(_filepath))
  
          return; 
  
  }
  
  
  
  
  
  CVideoReader m_vr = new CVideoReader ();
  
  m_vr->Open( (char *)inFile, CVideoReader::PRESET_MJPEG_CLOCKLESS_STREAM, CVideoReader::IMAGE_FORMAT_RGB1 );

• Reading geolocation data from a video file using FFMpeg/Xuggler

  23 décembre 2015, par agent154

  Using the MediaInfo application, I am able to see that a file taken with an iPhone 5 contains geolocation metadata, tagged both with ©xyz and com.apple.quicktime.location.ISO6709. I am not able to find any way to get this data using xuggler, however.

  Format                                   : MPEG-4
  
  Format profile                           : QuickTime
  
  Codec ID                                 : qt   0000.00 (qt  )
  
  File size                                : 7.50 MiB
  
  Duration                                 : 3s 537ms
  
  Overall bit rate                         : 17.8 Mbps
  
  Recorded date                            : 2015-12-17T14:32:23-0330
  
  Encoded date                             : UTC 2015-12-17 18:02:23
  
  Tagged date                              : UTC 2015-12-17 18:02:27
  
  Writing application                      : 8.4.1
  
  Writing library                          : Apple QuickTime
  
  Model                                    : iPhone 5
  
  ©xyz                                     : +47.5184-052.8046+133.390/
  
  Make                                     : Apple
  
  com.apple.quicktime.make                 : Apple
  
  com.apple.quicktime.creationdate         : 2015-12-17T14:32:23-0330
  
  com.apple.quicktime.location.ISO6709     : +47.5184-052.8046+133.390/
  
  com.apple.quicktime.software             : 8.4.1
  
  com.apple.quicktime.model                : iPhone 5

  As an aside, there seems to be a lot of metadata on this file that I can’t immediately find while debugging via xuggler.

  The question at Reading Geolocation from Quicktime Movies with Java (Xuggler) ? is asking the exact same question, but has no answers or comments at all, and is over 4 years old.

  Is anybody aware of a way to be able to get this data using xuggler as it is, or how I can modify the source and re-compile to make it work ? I am required to get this data for a work project. Thanks.

• linking libavcodec os x ffmpeg ApplicationServices.framework

  30 décembre 2015, par Grady Player

  Here is my error : (newer version of ffmpeg)

  dyld: Library not loaded: /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices
  
    Referenced from: /Users/me/path/to/lib/libavcodec.dylib
  
    Reason: Incompatible library version: libavcodec.dylib requires version 64.0.0 or later, but ApplicationServices provides version 1.0.0

  I have read the questions on SO that say you need to link ApplicationServices.framework... which I have done, it makes no difference...

  I have searched for other versions of that framework :

  $ mdfind ApplicationServices.framework
  
  /System/Library/Frameworks/ApplicationServices.framework

  just one...

  so then inspecting frameworks...

  $ otool -L /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices 
  
  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices:
  
      /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 1.0.0, current version 48.0.0)
  
      /System/Library/Frameworks/CoreGraphics.framework/Versions/A/CoreGraphics (compatibility version 64.0.0, current version 600.0.0)
  
  ...

  and libavcodec

  otool -L ../lib/libavcodec.dylib 
  
  ../lib/libavcodec.dylib:
  
      libavcodec.dylib (compatibility version 56.0.0, current version 56.60.100)
  
      @loader_path/libswresample.dylib (compatibility version 1.0.0, current version  ...
  
  ...
  
  /System/Library/Frameworks/ApplicationServices.framework/Versions/A/ApplicationServices (compatibility version 64.0.0, current version 600.0.0)

  I am compiling everything with -mmacosx-version-min=10.7

  so maybe a bug in the toolchain ?

  compiler :

  clang -v
  
  Apple LLVM version 7.0.2 (clang-700.1.81)
  
  Target: x86_64-apple-darwin15.2.0
  
  Thread model: posix

  linker :

  ld -v
  
  @(#)PROGRAM:ld  PROJECT:ld64-253.9
  
  configured to support archs: armv6 armv7 armv7s arm64 i386 x86_64 x86_64h armv6m armv7k armv7m armv7em (tvOS)
  
  LTO support using: Apple LLVM 7.0.2 (clang-700.1.81)