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Autres articles (44)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

Sur d’autres sites (4691)

  • Fail to set profile to high when using ffmpeg with libx264

    10 mars 2012, par user1258095

    Here is my command :

    ffmpeg -i input.avi -vcodec libx264 -vpre fast -vpre high -acodec copy output.avi

    The output :

    Input #0, avi, from 'short.avi':
    
  Metadata:
    
    encoder         : Lavf53.3.0
    
  Duration: 00:00:25.04, start: 0.000000, bitrate: 12705 kb/s
    
    Stream #0.0: Video: msmpeg4v2, yuv420p, 1920x1080, 24 tbr, 24 tbn, 24 tbc
    
    Stream #0.1: Audio: aac, 48000 Hz, 5.1, s16, 316 kb/s
    
    Metadata:
    
      title           : ED-CM-5.1-DVD-Final2
    
File for preset 'high' not found

    However, I am able to successfully transcode files when setting the profile to baseline or main, from the man page of x264 it is clear that "high" should also be a valid argument. I also want to know where these preset files are located in the file system(I am running ubuntu 11.10) so that I can make sure what arguments I can actually use for presets and profiles at the moment. I am very frustrated by this issue and would really appreciate any input from you guys. Thanks in advance.

  • Changing YUV values of AVFrames

    31 janvier 2012, par Kage

    I'm trying to apply an effect to a video by altering the YUV values using FFMpeg programmatically in C.

    Let's say I want to increase the luminescence of each pixel of each frame by 10.

    At the moment I can open a video, get the video stream, find a frame, decode the frame, alter the YUV values of the AvFrame->data, encode the frame, and save the frame to be played back.

    When I play back the video, the first frame looks as expected, but the next is even brighter and the one after that is even brighter, and each frame seems to be having more and more added to the Y values instead of just 10.

    I tried changing the code so instead of altering the pixels for each frame, it just alters the first AVFrame's data. However when I play the video back, it is not only the first frame that has been altered, but like the first 30 or so frames.

    Why are the other frames effected when I only change the AVFrame->data of the first frame ?

  • ffmpeg quality with watermark

    17 juin 2012, par trialgod

    i want to add a watermark to a video with ffmpeg. At this time nearly all things are computing properly, except the quality of the new video is massively lower than in the one of the original video.

    I also use ffmpeg-php and tried to set the minrate to the Bitrate of the original, but then i get an Error. Code seems like this at the moment.

    $video     = new ffmpeg_movie('hot_wheels_for_adults.flv');
    
$watermark = 'path/to/watermark.png';
    
$width     = $video->getFrameWidth();
    
$height    = $video->getFrameHeight();
    
$exec = 'ffmpeg -i hot_wheels_for_adults.flv ' .
    
        '-y -vf "movie=' . $watermark . ' ' .
    
        '[watermark]; [in][watermark] overlay=main_w-overlay_w-10:main_h-overlay_h-10 [out]" ' .
    
        '-f flv -s ' . $width . 'x' . $height . ' ' .
    
        '-minrate ' . $video->getBitRate() . ' ' .
    
        'bla2.flv';

    Thats it. Without the '-minrate' line the quality isnt good.
    Originalrate = 630615,
    Rate of new Video = 328000.

    With the '-sameq' flag i got a good quality, but it is raised from 6,5MB to nearly 30MB...

    What can i do now ?

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