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• Android Live Streaming based on javaCV + FFMpeg crashes by adding red5 link

  1er octobre 2015, par user1914692

  The Android application code is from :
  Android Live Streaming courtesy of JavaCV and FFMPEG

  It streams the live camera video from the device.

  I follow one comment’s instruction (Yoshio Numai), to use Red5 as the stream server.
  By Red5 itself, I can successfully use simpleBroadcaster and simpleSubscriber to stream and display the live camera (from the computer) steam.

  In the MainActivity.java, I change the code as below :

  private String ffmpeg_link = "rtmp://192.168.1.105/oflaDemo/red5StreamDemo"; 

  And I can start the app in my Android device (Nexus 4).
  after click "start", the app crash, pops out a small window, saying :
  "Unfortunately, JavaCV 0.3 Stream Test has stopped. OK."

  Once I click the OK button, I find the app is still live in the task list.

  But the same thing will happen.
  What’s wrong here ?

• Node Webkit-Designing Media Player support all media codec(format)

  14 décembre 2015, par Vish

  I am working on product which classify any kind of media into movies, tv shows, videos, audio and images. Node webkit with angularjs and node is its base. Now I am trying to bring local playback, which enabled this classified media to play inside this desktop app. Have done lot of research, following are feasible solution to me :

  1. Getting ffmpegsumo.dll with all codec support, hence html <audio></audio> and <video></video> able to play all this videos.
  2. All unsupported video or audio to be converted into supporting codec format and steam it to <audio></audio> and <video></video> tag.
  3. Use some third party plugin to support like WebCherima .

  Option 1 and 2 are not looking feasible to me. For option 1, we have compile Chromium 41.0.2272.76 or nw.js v0.12.3 to update ffmpegsumo.dll with more codec. On other side Option 2 looking difficult to get good performance. I have learn few limitation of third party plugins.
  Please provide some insight ? Thanks !

• lavc/vaapi_encode : add support for maxframesize

  5 mai 2022, par Linjie Fu

  lavc/vaapi_encode : add support for maxframesize
  Add support for max frame size :
  
      - max_frame_size (bytes) to indicate the max allowed size for frame.
  Control each encoded frame size into target limitation size by adjusting
  
  whole frame's average QP value. The driver will use multi passes to
  
  adjust average QP setp by step to achieve the target, and the result
  
  may not strictly guaranteed. Frame size may exceed target alone with
  
  using the maximum average QP value. The failure always happens on the
  
  intra(especially the first intra frame of a new GOP) frames or set
  
  max_frame_size with a very small number.
  example cmdline :
  
      ffmpeg -hwaccel vaapi -vaapi_device /dev/dri/renderD128 -f rawvideo \
  
          -v verbose -s:v 352x288 -i ./input.yuv -vf format=nv12,hwupload \
  
          -c:v h264_vaapi -profile:v main -g 30 -rc_mode VBR -b:v 500k   \
  
          -bf 3 -max_frame_size 40000 -vframes 100 -y ./max_frame_size.h264
  Max frame size was enabled since VA-API version (0, 33, 0), but query
  
  is available since (1, 5, 0). It will be passed as a parameter in picParam
  
  and should be set for each frame.
  Signed-off-by : Linjie Fu <linjie.fu@intel.com>
  
  Signed-off-by : Fei Wang <fei.w.wang@intel.com>
  

  • [DH] libavcodec/vaapi_encode.c
  • [DH] libavcodec/vaapi_encode.h