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Autres articles (43)

  • Multilang : améliorer l’interface pour les blocs multilingues

    18 février 2011, par

    Multilang est un plugin supplémentaire qui n’est pas activé par défaut lors de l’initialisation de MediaSPIP.
    Après son activation, une préconfiguration est mise en place automatiquement par MediaSPIP init permettant à la nouvelle fonctionnalité d’être automatiquement opérationnelle. Il n’est donc pas obligatoire de passer par une étape de configuration pour cela.

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Contribute to translation

    13 avril 2011

    You can help us to improve the language used in the software interface to make MediaSPIP more accessible and user-friendly. You can also translate the interface into any language that allows it to spread to new linguistic communities.
    To do this, we use the translation interface of SPIP where the all the language modules of MediaSPIP are available. Just subscribe to the mailing list and request further informantion on translation.
    MediaSPIP is currently available in French and English (...)

Sur d’autres sites (3412)

  • avfilter/vf_geq : use per-thread AVExpr for expression evaluation

    28 décembre 2019, par Marton Balint
    avfilter/vf_geq : use per-thread AVExpr for expression evaluation

    There was no consensus about separating AVExprState from AVExpr so here is a
    
minimal patch using the existing AVExpr to fix ticket #7528.
    

    Signed-off-by : Marton Balint <cus@passwd.hu>
    • [DH] doc/filters.texi
    • [DH] libavfilter/vf_geq.c

  • 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.

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