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  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

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  • ffmpeg AVPixelFormat and manager C++ System::Drawing::Imaging::PixelFormat conflict

    29 novembre 2016, par H S T

    There is #define PixelFormat AVPixelFormat inffmpeg. You can not use System::Drawing::Imaging::PixelFormat in a header file containing this. How can I usePixelFormat in C # ?

    .h

    using namespace System::Drawing::Imaging;
    
public ref class CTest{
    
    static Imaging::PixelFormat Format24bppRGB = Imaging::PixelFormat::Format24bppRgb
    
};

    .cpp

    #include"ffmpeg head file"
    
...

  • How to write v4l2 application with vivid (virtual video driver) for capturing video ?

    8 janvier 2016, par ransh

    I am trying to understand how to write v4l2 application.
    There is very well example in http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html , so I wanted to try to use it for capturing video with vivid (virtual device driver).

    I tried several resolution, pixelformat, different inputs,
    but on trying to display the captured file, it always has a sync problems ( the test bars of the video are keep moving in the horizontal axis).
    I tried to change resolution, pixelformat, in both capture application or player , but nothing helps.

    I compiled the v4l2 API example AS-IS from :
    http://linuxtv.org/downloads/v4l-dvb-apis/capture-example.html
    with minor modification in the —force part of the example (I also tried the example as is without modifications but it did not help), so that I choose hd input , and 1920x1080 resolution, V4L2_PIX_FMT_YUV420 (also tried V4L2_PIX_FMT_YUV422P) , progressive.

      if (force_format) {
    
            input = 3;  // <<-- HD input device
    
            if (-1==xioctl(fd,VIDIOC_S_INPUT,&input))
    
            {
    
             errno_exit("VIDIOC_S_INPUT");
    
            }
    
            fmt.fmt.pix.width       = 1920;
    
            fmt.fmt.pix.height      = 1080;
    
            fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_YUV420; // <<- tried also V4L2_PIX_FMT_YUV422P
    
            fmt.fmt.pix.field       = V4L2_FIELD_NONE; // <- trying to capture progressive
    

    
            if (-1 == xioctl(fd, VIDIOC_S_FMT, &fmt))
    
                    errno_exit("VIDIOC_S_FMT");
    

    
    } else {

    I run the application with (the compiled code using pixelformat = V4L2_PIX_FMT_YUV420 trial ) :

    ./v4l2_example -f -o -c 10  > cap_yuv420p.yuv

    And (the compiled code using pixelformat = V4L2_PIX_FMT_YUV422P trial )

    ./v4l2_example -f -o -c 10  > cap_yuv422p.yuv

    I’ve tried to play them with :

    ffplay -f rawvideo -pixel_format yuv420p -video_size 1920x1080 -i cap_yuv420p.yuv

    And

    ffplay -f rawvideo -pixel_format yuv422p -video_size 1920x1080 -i cap_yuv422p.yuv

    These are the captured video files from my above trials :

    https://drive.google.com/folderview?id=0B22GsWueReZTUS1tSHBraTAyZ00&usp=sharing

    I probably am doing something wrong.
    Is there any idea what’s wrong in my configurations or how I can debug it better ?

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