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Autres articles (59)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

Sur d’autres sites (5680)

  • Stream frame from video to pipeline and publish it to HTTP mjpeg via ffmpeg

    18 juillet 2018, par Rafał Sardaw

    Let’s say I have very simple program which has been written in C++ with usage of OpenCV 3.4 under Windows 10.

    VideoCapture cap("test.avi");
    
Mat frame; 
    
while(true){
    
    if (!cap.read(frame))  
    
    { 
    
        break;
    
    }
    
    // SEND FRAME TO PIPE
    
}

    It’s just simple example of reading frame by frame avi video, but in the end it’s going to be server-side application which produces modified stream from few ip cameras. I want to use html5 video tag to display output directly on website, but it’s quite hard to find useful information related with that topic ( for Windows ). If I understand it correctly I need to define pipeline and send there MJPEG stream, with help of FFMPEG, where FFMPEG will create local HTTP server on specific port. Anyone ever challenged similar task under Windows ? I guess that 80% of task is related with proper usage of ffmpeg command line tool, one of my priorities is minimal modification of application.

    So to make long story short, I have application which I can call directly from command line :

    stream_producer.exe CAMERA_1

    and I want to be able to see MJPEG stream under :

    http://localhost:1234

    which can be displayed on local website in intranet.

    Regards.

  • What is the most performant way to render unmanaged video frames in WPF ?

    18 avril 2017, par superware

    I’m using FFmpeg library to receive and decode H.264/MPEG-TS over UDP with minimal latency (something MediaElement can’t handle).

    On a dedicated FFmpeg thread, I’m pulling PixelFormats.Bgr32 video frames for display. I’ve already tried InteropBitmap :

    _section = CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, PAGE_READWRITE, 0, size, null);
    
_buffer = MapViewOfFile(_section, FILE_MAP_ALL_ACCESS, 0, 0, size);
    
Dispatcher.Invoke((Action)delegate()
    
{
    
    _interopBitmap = (InteropBitmap)Imaging.CreateBitmapSourceFromMemorySection(_section, width, height, PixelFormats.Bgr32, (int)size / height, 0);
    
    this.Source = _interopBitmap;
    
});

    And then per frame update :

    Dispatcher.Invoke((Action)delegate()
    
{
    
    _interopBitmap.Invalidate();
    
});

    But performance is quite bad (skipping frames, high CPU usage etc).

    I’ve also tried WriteableBitmap : FFmpeg is placing frames in _writeableBitmap.BackBuffer and per frame update :

    Dispatcher.Invoke((Action)delegate()
    
{
    
    _writeableBitmap.Lock();
    
});
    
try
    
{
    
    ret = FFmpegInvoke.sws_scale(...);
    
}
    
finally
    
{
    
    Dispatcher.Invoke((Action)delegate()
    
    {
    
        _writeableBitmap.AddDirtyRect(_rect);
    
        _writeableBitmap.Unlock();
    
    });
    
}

    Experiencing almost the same performance issues (tested with various DispatcherPriority).

    Any help will be greatly appreciated.

  • What is the most performant way to render unmanaged video frames in WPF ?

    27 mai 2017, par superware

    I’m using FFmpeg library to receive and decode H.264/MPEG-TS over UDP with minimal latency (something MediaElement can’t handle).

    On a dedicated FFmpeg thread, I’m pulling PixelFormats.Bgr32 video frames for display. I’ve already tried InteropBitmap :

    _section = CreateFileMapping(INVALID_HANDLE_VALUE, IntPtr.Zero, PAGE_READWRITE, 0, size, null);
    
_buffer = MapViewOfFile(_section, FILE_MAP_ALL_ACCESS, 0, 0, size);
    
Dispatcher.Invoke((Action)delegate()
    
{
    
    _interopBitmap = (InteropBitmap)Imaging.CreateBitmapSourceFromMemorySection(_section, width, height, PixelFormats.Bgr32, (int)size / height, 0);
    
    this.Source = _interopBitmap;
    
});

    And then per frame update :

    Dispatcher.Invoke((Action)delegate()
    
{
    
    _interopBitmap.Invalidate();
    
});

    But performance is quite bad (skipping frames, high CPU usage etc).

    I’ve also tried WriteableBitmap : FFmpeg is placing frames in _writeableBitmap.BackBuffer and per frame update :

    Dispatcher.Invoke((Action)delegate()
    
{
    
    _writeableBitmap.Lock();
    
});
    
try
    
{
    
    ret = FFmpegInvoke.sws_scale(...);
    
}
    
finally
    
{
    
    Dispatcher.Invoke((Action)delegate()
    
    {
    
        _writeableBitmap.AddDirtyRect(_rect);
    
        _writeableBitmap.Unlock();
    
    });
    
}

    Experiencing almost the same performance issues (tested with various DispatcherPriority).

    Any help will be greatly appreciated.

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