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• Media player get stuck in the middle of a buffered range on Chrome

  29 septembre 2019, par Feng Yu

  WHAT IS MY PROBLEM ?

  My website’s live streaming player use hls.js. From my server’s stat, there is many case where player get stuck in the middle of a buffered range.

  Here is my server raw stat log(removed some useless params) :

  tm=2019-09-27 12:04:41`bufferLevel=8.447303999999974`currentTime=158.4`buffered=[6.024,166.832]`readyState=4`ua=Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.116 Safari/537.36 QBCore/3.53.1153.400 QQBrowser/9.0.2524.400 Tencent AppMarket/4.8 GameCenter

  currentTime is got by HTMLMediaElement.currentTime and buffered is got by HTMLMediaElement.buffered :

  currentTime=158.4
  
  buffered=[6.024,166.832]
  
  readyState=4

  From W3c :

  If HTMLMediaElement.buffered contains a TimeRange that includes the current playback position and enough data to ensure uninterrupted playback :

  1. Set the HTMLMediaElement.readyState attribute to HAVE_ENOUGH_DATA.
  2. Playback may resume at this point if it was previously suspended by a transition to HAVE_CURRENT_DATA.

  In this case, 613.3 is in the middle of [469.277,677.612], video should be progressing, but it is not.

  Hls.js will periodly check currentTime has progressed every 100ms. if currentTime has not progressed for 1000ms, then hls.js will trigger STALL event and I will send a stall stat to server.

  I cannot reproduce this problem on my side, it only appears on my server stat.

  WHAT I’VE TRIED

  shaka player has a module detect this case(https://www.ellealcatrase.eu/player2/docs/api/lib_media_stall_detector.js.html), Its comment shows that :

  Some platforms/browsers can get stuck in the middle of a
  buffered range (e.g. when seeking in a background tab). Detect when
  we get stuck so that the player can respond.

  but I cannot reproduce when my browser is in a background tab.

• Choose good solution for streaming video in android [closed]

  28 novembre 2013, par Alex Tran

  I always find solution for fixing this bug

  "Invalid streaming" or "Can not play video"

  on many devices.

  I researched and found many people get this bug.

  There are two solutions :

  1. At Server side : Convert to appropriate "h264 avc baseline + web optimized *.mp4" format for Android device can stream & play video.

  2. At Android side : Use third-party library to fix :

     • VitamioBundle : I tested on many devices,
       some devices (Android version 4.0.3 or above, and have StageFright
       framework) stream & play video very good, but the others (before
       Android version 4.0) is not . I think the framework on the device causes it. (related to OpenCore/StageFright framework)

     • Ffmpeg : I researched about Android NDK. And know how to build to file *.so.

  Actually, I can not edit at server side.

  Can I use ffmpeg in second solution ?

  But I don't really know it is the good way or not ?

  p/s : Actually, I want to stream and play video from the server on all devices have version from Froyo 2.2.

  Please tell me,

  Regards,

• Faster way to append to PyList in c++

  19 décembre 2022, par Timothy Halim

  I'm new to c++ and looking for a faster way to append pixel value to python list, since currrently on loop it takes around 0.1 second to process one frame of image with resolution of 854x480, do anyone have any idea ?

  


  I tried to avoid using third party module if possible.

  


  Here is what I've got so far :

  


  PyObject* byte_list = PyList_New(static_cast(0));

AVFrame *pFrameRGB = av_frame_alloc();
av_frame_copy_props(pFrameRGB, this->pFrame);
pFrameRGB->width = this->pFrame->width;
pFrameRGB->height = this->pFrame->height;
pFrameRGB->format = AV_PIX_FMT_RGB24;
av_frame_get_buffer(pFrameRGB, 0);

sws_scale(this->swsCtx, this->pFrame->data, this->pFrame->linesize, 0, 
        this->pCodecContext->height, pFrameRGB->data, pFrameRGB->linesize);

if (this->_debug) {
    std::cout << "Frame linesize " << pFrameRGB->linesize[0] << "\n";
    std::cout << "Frame width " << pFrameRGB->width << "\n";
    std::cout << "Frame height " << pFrameRGB->height << "\n";
}

// This looping method seems slow
for(int y = 0; y < pFrameRGB->height; ++y) {
    for(int x = 0; x < pFrameRGB->width; ++x) {
        int p = x * 3 + y * pFrameRGB->linesize[0];
        int r = pFrameRGB->data[0][p];
        int g = pFrameRGB->data[0][p+1];
        int b = pFrameRGB->data[0][p+2];
        PyList_Append(byte_list, PyLong_FromLong(r));
        PyList_Append(byte_list, PyLong_FromLong(g));
        PyList_Append(byte_list, PyLong_FromLong(b));
    }
}

av_frame_free(&pFrameRGB);


  


  Thanks !