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  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • 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 (...)

  • 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 (...)

Sur d’autres sites (9874)

  • How to compile ffmpeg.c into shared library ?

    10 avril 2014, par tmartiro

    Is it possible to compile ffmpeg.c into the shared library ? I need it in shared library form to link with my C program and call main function in ffmpeg.c.

  • How to get the exact macroblock bit sizes from H.264 (CABAC) bitstream

    15 juillet 2013, par Bhaskar Dey

    I am interested to get the exact size of a macroblock (MB) in bits form H.264 bitstream (CABAC entropy coded). I would like to verify this against the MB sizes available form commercial bitstream analyzers (like Codecvisa etc). I had a look at the FFmpeg source files cabac.h, h264_cabac.c and h.264.c.

    In function ff_h264_decode_mb_cabac(H264Context *h) of h264_cabac.c, I computed the MB sizes using CABAC bytestream pointer as :

    int ff_h264_decode_mb_cabac(H264Context *h) {
    

    
    int b=(int)h->cabac.bytestream; 
    

    
    // function body of ff_h264_decode_mb_cabac() unmodified
    

    
    b=(int)h->cabac.bytestream-b;
    
    //print value of (b<<3), i.e., MB bit size(b is the difference in bytes);
    

    
}

    This gives the value of MB size in bits but accurate within 16 of the actual bit size found using H.264 analyzers. I also printed the contents of h->cabac.bytestream (in binary) at the start and at the end of the function call but couldn't locate the exact MB-boundary bit positions(see following table for an example). Any hint would be of immense help.

    Frame No  MB index(type)        start(hex)               end(hex)                 b<<3  Exact size(analyzer)
    
....
    
Frame 2,  742(P_L0_16x16),      1110011110100001 (e7a1), 0000001110010110 (0396),   80    78
    
Frame 2,  743(P_8x8),           0000001110010110 (0396), 0000101101000101 (0b45),  400   400
    
Frame 2,  744(P_L0_L0_16x8),    0000101101000101 (0b45), 0110011001011011 (665b),  336   325
    
Frame 2,  745(P_L0_L0_16x8),    0110011001011011 (665b), 1010001010010000 (a290),  272   284
    
Frame 2,  746(P_8x8),           1010001010010000 (a290), 0010010000111101 (243d),  464   463
    
....

  • capture video preview with ffmpeg during encoding

    9 juillet 2013, par Hitesh Gupta

    I am trying to implement an encoder using ffmpeg which should work similar to Expression Encoder. Till now, I am able to connect with live sources (camera etc.) and started encoding on publish points by command :
    ffmpeg -f dshow -i video="My video device":audio="My audio device." -pix_fmt yuv420p -movflags isml+frag_keyframe -f ismv -threads 0 -c:v libx264 -map 0:v -b:v:0 124k -map 0:a -b:a:0 244k -r 240 http://My_Server.com/PublishPoints/mypublishpoint.isml/Streams(Encoder1)

    But before start encoding, I also need to show preview on my form.
    I Googled a lot about capturing video from ffmpeg and display on windows form but could not find any way.
    so, please somebody suggest me the best way to perform this.

    Thanks in advanced.

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