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• FFMPEG encoding with Intel Quick Sync, throwing "Access violation reading location "

  22 octobre 2015, par Paul Knopf

  I am using FFMPEG ffmpeg-20150610-git-913685f, from here.

  Using this library, I setup a application that captures UYVY frames from my frame grabber and encodes/muxes them to an MP4 file, using libx264. Works without issues.

  Now, I wanted to try to enabling Intel Quick Sync, so I changed the encoder.

  // old (libx264)
  
  //AVCodec* codec = avcodec_find_encoder(AV_CODEC_ID_H264);
  
  // new (Intel Quick Sync)
  
  AVCodec* codec = avcodec_find_encoder_by_name("h264_qsv");

  It finds the encoder ok. However, at the time of encoding a frame, I get the following exception.

  Unhandled exception at 0x000000005D4DDC9E (avcodec-56.dll) in
  MedXChangeDecLinkTest.exe : 0xC0000005 : Access violation reading
  location 0x0000000000000048.

  The exact API call is :

  avcodec_encode_video2(_internals->videoStream.stream->codec, &pkt, _internals->videoStream.frame, &got_packet);

  Is there more I need to do ? I noticed that there was a commit that added some additional pixel formats for QSV here. Do I have to do something differently, compared to how things were done with libx264 ?

  UPDATE : I also just realized that I am getting an error on the stdout.

  [h264_qsv @ 000000c7e6d8e680] Specified pixel format yuv420p is invalid or not supported

• avcodec/libdcadec : require first public release

  27 novembre 2015, par James Almer

  avcodec/libdcadec : require first public release
  Reviewed-by : Hendrik Leppkes <h.leppkes@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] configure
  • [DH] libavcodec/libdcadec.c

• OpenGL (GLEW) + FFMPEG + VS2010 release build

  6 décembre 2015, par rickhik

  Currently I am working on a application that uses OpenGL (GLEW) and FFMPEG (libav’s) in Visual Studio 2010. The GLEW libs are included as Additional Libraries. The libav is set via a header file with extern "c" and pragma comment lib.

  The application opens a OpenGL window which draws some quads with textures via FFMPEG. I want to use this application for my volunteer job at a TV station of a Childrens Hospital.

  The problem I have is building a release version of my project. When I am building a Debug version it all works fine. I get a OpenGL Window with the quads. When I change Debug into Release and start the Debugger, it gives me the message "entry point of procedure __GLEW_EXT_framebuffer_object not found in DLL avcodec-56.dll", which is a bit strange to me because of the fact that the GLEW is not part of the avcodec-56.dll ?

  I can solve this issue by going to the project settings -> Linker -> Optimization and switch References from Yes(/OPT:REF) to No(/OPT:NOREF). I start the debugger to build the solution and it works as well. Now when I go to the Release folder of the project and start the build executable, the OpenGL Window stays black without giving me an error message.

  I hope you guys can help me out.

  @michael-iv I saw you had a similar issue