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• How to get stream info from opened file in ffmpeg ?

  31 mai 2013, par Srv19

  I am trying to read video file using ffmpeg. I had working code that corresponded to somewhat old version of it, and started to try and upgrade to latest build version, exchanging all those deprecated functions for their actual analogues.

  However i have run into a problem. No streams seem to be retrieved and the load of video stops dead in tracks.

  here is the code i am using :

     // Open video file
  
     if(avformat_open_input(&pFormatCtx, filename.toStdString().c_str(), NULL, NULL)!=0)
  
         return FILE_NOT_OPENED; // Couldn't open file
  
  
  
     // Retrieve stream information
  
     if(avformat_find_stream_info(pFormatCtx,NULL)<0)
  
         return NO_STREAM_INFO; // Couldn't find stream information
  
  
  
     // Dump information about file onto standard error
  
     av_dump_format(pFormatCtx, 0, filename.toStdString().c_str(), false);
  
  
  
     // Find the first video stream
  
     videoStream=-1;
  
     for(unsigned i=0; inb_streams; i++)
  
         if(pFormatCtx->streams[i]->codec->codec_type==ffmpeg::AVMEDIA_TYPE_VIDEO)
  
         {
  
             videoStream=i;
  
             break;
  
         }
  
     if(videoStream==-1)
  
         return OTHER; // Didn't find a video stream
  
  
  
     // Get a pointer to the codec context for the video stream
  
     pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
  
  
     // Find the decoder for the video stream
  
     pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
     if(pCodec==NULL)
  
         return CODEC_NOT_FOUND; // Codec not found
  
  
  
     // Open codec
  
     if(avcodec_open2(pCodecCtx, pCodec,NULL)<0)
  
         return CODEC_NOT_OPENED; // Could not open codec

  The problem arises in the cycle through video streams in ffmpeg::AVFormatContext *pFormatCtx. nb_streams field is 0, and i never actually enter the cycle, and codec is not loaded etc. Strange thing is, av_dump_format gives following output :

  License: GPL version 3 or later
  
  AVCodec version 3606372
  
  AVFormat configuration: --disable-static --enable-shared --enable-gpl --enable-version3 --disable-w32threads --enable-avisynth --enable-bzlib --enable-fontconfig --enable-frei0r --enable-gnutls --enable-iconv --enable-libass --enable-libbluray --enable-libcaca --enable-libfreetype --enable-libgsm --enable-libilbc --enable-libmodplug --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-librtmp --enable-libschroedinger --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvo-aacenc --enable-libvo-amrwbenc --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxavs --enable-libxvid --enable-zlib
  
  [asf @ 004e9540] Stream #0: not enough frames to estimate rate; consider increasing probesize
  
  Input #0, asf, from 'C:/Users/Public/Videos/Sample Videos/Wildlife.wmv':
  
    Metadata:
  
      SfOriginalFPS   : 299700
  
      WMFSDKVersion   : 11.0.6001.7000
  
      WMFSDKNeeded    : 0.0.0.0000
  
      comment         : Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball
  
      title           : Wildlife in HD
  
      copyright       : В© 2008 Microsoft Corporation
  
      IsVBR           : 0
  
      DeviceConformanceTemplate: AP@L3
  
    Duration: 00:00:30.09, start: 0.000000, bitrate: 6977 kb/s
  
      Stream #0:0(eng): Audio: wmav2 (a[1][0][0] / 0x0161), 44100 Hz, 2 channels, fltp, 192 kb/s
  
      Stream #0:1(eng): Video: vc1 (Advanced) (WVC1 / 0x31435657), yuv420p, 1280x720, 5942 kb/s, 29.97 tbr, 1k tbn, 1k tbc

  and there are 2 streams, clear as day.

  I am utterly baffled. Please help.

• Connect ffmpeg to Visual Studio 2008

  29 avril 2014, par user2274492

  I try to connect ffmpeg to visual c++ like this, but when I type "./configure —toolchain=msvc" I have this error :

  c99wrap cl is unable to create an executable file.

  If c99wrap cl is a cross-compiler, use the —enable-cross-compile
  option. Only do this if you know what cross compiling means.

  C compiler test failed

  config.log :

  WARNING : pkg-config not found, library detection may fail. mktemp -u
  XXXXXX ./configure : line 728 : mktemp : command not found WARNING :
  Unknown C compiler C :\c99\c99wrap cl, unable to select optimal CFLAGS
  check_ld cc check_cc BEGIN /tmp/ffconf..ZHENYA.500.5884.c
  1 int main(void) return 0 ; END /tmp/ffconf..ZHENYA.500.5884.c C :\c99\c99wrap cl -c -o /tmp/ffconf..ZHENYA.500.5884.o
  /tmp/ffconf..ZHENYA.500.5884.c fatal error C1510 : Cannot load language
  resource clui.dll. C compiler test failed.

  What’s the problem ? Or just send me files that you got after compilation with this (I would not have asked, but I fix this two months) :

  ./configure —toolchain=msvc

  make

  make install

  ---

  log after changes :

     WARNING: pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  Uxplas
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf.WcAVdgRZ.c
  
      1   int main(void){ return 0; }
  
  END /tmp/ffconf.WcAVdgRZ.c
  
  c99wrap cl -nologo -D_USE_MATH_DEFINES -Dinline=__inline -FIstdlib.h -Dstrtoll=_strtoi64 -c -Fo /tmp/ffconf.jQtxnkfv.o /tmp/ffconf.WcAVdgRZ.c
  
  ffconf.WcAVdgRZ.c
  
  ffconf.jQtxnkfv.o_converted.c
  
  c99wrap link -o /tmp/ffconf.sPZUPuMJ.exe /tmp/ffconf.jQtxnkfv.o
  
  link: invalid option -- o
  
  Try `link --help' for more information.
  
  C compiler test failed.

  log from second computer :

  WARNING: pkg-config not found, library detection may fail.
  
  mktemp -u XXXXXX
  
  ./configure: line 749: mktemp: command not found
  
  WARNING: Unknown C compiler c99wrap cl, unable to select optimal CFLAGS
  
  check_ld cc
  
  check_cc
  
  BEGIN /tmp/ffconf..zhenya.500.4036.c
  
  END /tmp/ffconf..zhenya.500.4036.c
  
  c99wrap cl -I/local/include -c -o /tmp/ffconf..zhenya.500.4036.o /tmp/ffconf..zhenya.500.4036.c
  
  ./configure: line 749: c99wrap: command not found
  
  C compiler test failed.

  Errors :

  1>ConsoleApplication1.obj : error LNK2028: ёё√ыър эр эхЁрчЁх°хээє■ ыхъёхьє (0A000039) "void __cdecl av_register_all(void)" (?av_register_all@@$$FYAXXZ) т ЇєэъЎшш "int __clrcall main(cli::array<class>^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z)
  
  1>ConsoleApplication1.obj : error LNK2019: ёё√ыър эр эхЁрчЁх°хээ√щ тэх°эшщ ёшьтюы "void __cdecl av_register_all(void)" (?av_register_all@@$$FYAXXZ) т ЇєэъЎшш "int __clrcall main(cli::array<class>^)" (?main@@$$HYMHP$01AP$AAVString@System@@@Z)
  
  1>c:\users\Zhenya\documents\visual studio 2012\Projects\ConsoleApplication1\Debug\ConsoleApplication1.exe : fatal error LNK1120: эхЁрчЁх°хээ√ї тэх°эшї ¤ыхьхэЄют: 2
  
  </class></class>

• avcodec : add D3D12VA hardware accelerated H264 decoding

  5 décembre 2023, par Wu Jianhua

  avcodec : add D3D12VA hardware accelerated H264 decoding
  The implementation is based on :
  
  https://learn.microsoft.com/en-us/windows/win32/medfound/direct3d-12-video-overview
  With the Direct3D 12 video decoding support, we can render or process
  
  the decoded images by the pixel shaders or compute shaders directly
  
  without the extra copy overhead, which is beneficial especially if you
  
  are trying to render or post-process a 4K or 8K video.
  The command below is how to enable d3d12va :
  
  ffmpeg -hwaccel d3d12va -i input.mp4 output.mp4
  Signed-off-by : Wu Jianhua <toqsxw@outlook.com>
  
  Signed-off-by : Tong Wu <tong1.wu@intel.com>
  

  • [DH] configure
  • [DH] libavcodec/Makefile
  • [DH] libavcodec/d3d11va.h
  • [DH] libavcodec/d3d12va_decode.c
  • [DH] libavcodec/d3d12va_decode.h
  • [DH] libavcodec/d3d12va_h264.c
  • [DH] libavcodec/dxva2.c
  • [DH] libavcodec/dxva2.h
  • [DH] libavcodec/dxva2_av1.c
  • [DH] libavcodec/dxva2_h264.c
  • [DH] libavcodec/dxva2_hevc.c
  • [DH] libavcodec/dxva2_internal.h
  • [DH] libavcodec/dxva2_mpeg2.c
  • [DH] libavcodec/dxva2_vc1.c
  • [DH] libavcodec/dxva2_vp9.c
  • [DH] libavcodec/h264_slice.c
  • [DH] libavcodec/h264dec.c
  • [DH] libavcodec/hwaccels.h
  • [DH] libavcodec/hwconfig.h