Recherche avancée

Médias (1)

Mot : - Tags -/belgique

Autres articles (60)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

Sur d’autres sites (5663)

  • avutil/tree : Document the guaranteed ordering of compare arguments for av_tree_find()

    25 octobre 2015, par Michael Niedermayer
    avutil/tree : Document the guaranteed ordering of compare arguments for av_tree_find()

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavutil/tree.h

  • How to compare two look alike videos of different codec, size, resolution

    23 octobre 2015, par Abdul Gafoor

    Is it possible to compare pragmatically, two look alike videos of different codec, size and resolution. I went through the some tools like ffmpeg opencv.

    Or in the another context, Lets an image should be compared with video and find out the exact time where the image visually present in the given video. The codecs, size and resolution of video and image may vary.

  • Segmentation Fault error when trying to compare two videos with pHash library and its ruby bindings

    10 juillet 2014, par anado1771

    I have set up my system with the latest ffmpeg and pHash libraries (ffmpeg-2.2.1 and pHash-0.9.6) as well as the pHash ruby gem (https://github.com/toy/pHash).

    I am using ruby and attempting to compare two video files like this :

    require 'phash/video'
    

    
video1 = Phash::Video.new('video1.mp4')
    
video2 = Phash::Video.new('video2.mp4')
    

    
video1 % video2

    Executing this script results in a Segmentation fault :

    ..../gems/pHash-1.1.4/lib/phash/video.rb:20: [BUG] Segmentation fault
    
ruby 1.9.3p545 (2014-02-24 revision 45159) [x86_64-darwin13.1.0]
    

    
-- Control frame information -----------------------------------------------
    
c:0008 p:---- s:0029 b:0029 l:000028 d:000028 CFUNC  :ph_dct_videohash
    
c:0007 p:0042 s:0024 b:0024 l:000023 d:000023 METHOD .../gems/pHash-1.1.4/lib/phash/video.rb:20
    
c:0006 p:0038 s:0017 b:0017 l:000016 d:000016 METHOD .../gems/pHash-1.1.4/lib/phash.rb:43
    
c:0005 p:0025 s:0014 b:0014 l:000013 d:000013 METHOD .../gems/pHash-1.1.4/lib/phash.rb:39
    
c:0004 p:0011 s:0011 b:0011 l:000010 d:000010 METHOD .../gems/pHash-1.1.4/lib/phash.rb:48
    
c:0003 p:0050 s:0006 b:0006 l:000128 d:0011b8 EVAL   video_test_phash.rb:3
    
c:0002 p:---- s:0004 b:0004 l:000003 d:000003 FINISH
    
c:0001 p:0000 s:0002 b:0002 l:000128 d:000128 TOP   
    

    
-- Ruby level backtrace information ----------------------------------------
    
video_test_phash.rb:3:in `<main>'
    
.../gems/pHash-1.1.4/lib/phash.rb:48:in `similarity'
    
.../gems/pHash-1.1.4/lib/phash.rb:39:in `phash'
    
.../gems/pHash-1.1.4/lib/phash.rb:43:in `compute_phash'
    
.../gems/pHash-1.1.4/lib/phash/video.rb:20:in `video_hash'
    
.../gems/pHash-1.1.4/lib/phash/video.rb:20:in `ph_dct_videohash'
    

    
...
    

    
Abort trap: 6
    
</main>

    It appears that the crash happens in the ph_dct_videohash function which is part of the pHash library. The function is in file pHash.cpp. I am copying it here in case it would make sense to someone :

    ulong64* ph_dct_videohash(const char *filename, int &amp;Length){
    

    
    CImgList *keyframes = ph_getKeyFramesFromVideo(filename);
    
    if (keyframes == NULL)
    
    return NULL;
    

    
    Length = keyframes->size();
    

    
    ulong64 *hash = (ulong64*)malloc(sizeof(ulong64)*Length);
    
    CImg<float> *C = ph_dct_matrix(32);
    
    CImg<float> Ctransp = C->get_transpose();
    
    CImg<float> dctImage;
    
    CImg<float> subsec;
    
    CImg currentframe;
    

    
    for (unsigned int i=0;i &lt; keyframes->size(); i++){
    
    currentframe = keyframes->at(i);
    
    currentframe.blur(1.0);
    
    dctImage = (*C)*(currentframe)*Ctransp;
    
    subsec = dctImage.crop(1,1,8,8).unroll('x');
    
    float med = subsec.median();
    
    hash[i] =     0x0000000000000000;
    
    ulong64 one = 0x0000000000000001;
    
    for (int j=0;j&lt;64;j++){
    
        if (subsec(j) > med)
    
        hash[i] |= one;
    
        one = one &lt;&lt; 1;
    
    }
    
    }
    

    
    keyframes->clear();
    
    delete keyframes;
    
    keyframes = NULL;
    
    delete C;
    
    C = NULL;
    
    return hash;
    
}
    
</float></float></float></float>

    Any help is very much appreciated !

Navigation