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• Streaming video written using FFmpeg (C# using AutoGen) sends multiple data requests

  26 juin 2016, par williamtroup

  I’ve written a video generator that rights a video in h264 format (mp4). When I stream the video from my azure service, i’m seeing the following network traffic :

  

  The AVCodecContext layout I’m using is as follows :

  AVCodec* videoCodec = ffmpeg.avcodec_find_encoder(AVCodecID.AV_CODEC_ID_H264)
  
  AVCodecContext* videoCodecContext = ffmpeg.avcodec_alloc_context3(videoCodec);
  
  videoCodecContext->bit_rate = 400000;
  
  videoCodecContext->width = 1280;
  
  videoCodecContext->height = 720;
  
  videoCodecContext->gop_size = 12;
  
  videoCodecContext->max_b_frames = 1;
  
  videoCodecContext->pix_fmt = videoCodec->pix_fmts[0];
  
  videoCodecContext->codec_id = videoCodec->id;
  
  videoCodecContext->codec_type = videoCodec->type;
  
  videoCodecContext->time_base = new AVRational
  
  {
  
      num = 1,
  
      den = 30
  
  };
  
  
  
  ffmpeg.av_opt_set(videoCodecContext->priv_data, "preset", "ultrafast");

  I cannot figure out how to solve this problem. Videos generating using Windows Movie Maker stream perfectly.

  Also, this appears to only happening in Google Chrome.

• OpenCV3.1 compilation error 'ffmpeg/avformat.h' file not found

  15 décembre 2016, par aquagremlin

  On MacOS 10.9.5 Mavericks. I used homebrew to install Python, cmake, ffmpeg.
  Entering ffmpeg in terminal shows it is installed.
  I downloaded Opencv3 and opencv_contrib

  Then cmake with this :

  cmake -D CMAKE_BUILD_TYPE=RELEASE \
  
      -D WITH_CUDA=OFF -D CMAKE_INSTALL_PREFIX=/Users/stefan/Downloads/opencv-3.1.0dl/build \
  
      -D PYTHON2_LIBRARIES=/usr/local/Cellar/python/2.7.10/Frameworks/Python.framework/Versions/2.7/bin \
  
      -D PYTHON2_PACKAGES_PATH=~/.virtualenvs/cv/lib/python2.7/site-packages \
  
      -D PYTHON2_NUMPY_INCLUDE_DIRS=~/.virtualenvs/cv/lib/python2.7/site-packages/numpy/core/include \
  
      -D PYTHON2_INCLUDE_DIR=/usr/local/Frameworks/Python.framework/Headers \
  
      -D INSTALL_PYTHON_EXAMPLES=ON -D WITH_TBB=ON  -D INSTALL_C_EXAMPLES=ON \
  
      -D FFMPEG_INCLUDE_DIR=/usr/local/Cellar/ffmpeg/3.0.2/include \
  
      -D FFMPEG_LIB_DIR=/usr/local/Cellar/ffmpeg/3.0.2/lib \
  
      -D BUILD_EXAMPLES=ON \
  
      -D OPENCV_EXTRA_MODULES_PATH=~/Downloads/opencv_contrib-3.0.0/modules ..

  Terminal output included this :

  --   Video I/O:
  
  --     DC1394 1.x:                  NO
  
  --     DC1394 2.x:                  NO
  
  --     FFMPEG:                      YES
  
  --       codec:                     YES (ver 57.24.102)
  
  --       format:                    YES (ver 57.25.100)
  
  --       util:                      YES (ver 55.17.103)
  
  --       swscale:                   YES (ver 4.0.100)
  
  --       resample:                  YES (ver 3.0.0)
  
  --       gentoo-style:              YES

  But CMakeError.log had this as its only error :

  ffmpeg/avformat.h file not found

  The file does exist at

  /usr/local/Cellar/ffmpeg/3.0.2/include/libavformat/avformat.h

  I do not understand why I am getting this error if I properly specified the FFMPEG include directories in the cmake command. Also the variables FMPEG_INCLUDE_DIR and FFMPEG_LIB_DIR do not exist in the file, CMakeLists.txt.
  Does that make my use of those variables in the cake command useless ?

• Read a growing MFX file for live streaming sports match file [closed]

  12 novembre 2024, par Sumit Chaudhary

  I'm struggling to read a growing MXF file in real time for a live sports streaming project in python. I can read the video in 5-minute chunks provided by the recording software, for the same match and I’m able to load the full file (around 750GB) once the match is over and file is complete. However, I need to process the file as it’s still growing. Any suggestions on how to approach this ?