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Médias (91)

Autres articles (42)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • Supporting all media types

    13 avril 2011, par

    Unlike most software and media-sharing platforms, MediaSPIP aims to manage as many different media types as possible. The following are just a few examples from an ever-expanding list of supported formats : images : png, gif, jpg, bmp and more audio : MP3, Ogg, Wav and more video : AVI, MP4, OGV, mpg, mov, wmv and more text, code and other data : OpenOffice, Microsoft Office (Word, PowerPoint, Excel), web (html, CSS), LaTeX, Google Earth and (...)

  • 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 (...)

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  • meaning of ffmpeg filter option values for modifying contrast/brightness/gamma

    5 septembre 2016, par benoy

    Context : I am using ffmpeg for processing a raw video file in raw y4m format to mp4 at various brightness values for an experiment looking at OLED display performance. After looking at the ffmpeg documentation I was able to find the following filter (eq) for modifying the brightness of the video.
    https://ffmpeg.org/ffmpeg-filters.html#eq

    I used the information from the ffmpeg documentation and the following article (https://wjwoodrow.wordpress.com/2015/07/12/more-ffmpeg-hell/) to get videos with different qualities. But neither the ffmpeg documentation nor the article explains these values in detail.

    Question : Now my query is that, what does these eq values range correspond to ? Is it a percentage ? For example,

    ffmpeg -i input_1080p24.y4m -vf eq=1:-0.5:1:1:1:1:1:1 -vcodec libx264 -b:v 8000k -s 1920x1080 -g 15 -n -r 30 output_1080p.mp4

    gives me a output video with reduced brightness. But how do I quantify this brightness reduction ? Does this eq = -0.5 correspond to 50% reduction in original brightness ? In other words, is this a linear scale ?

    This is my first post on stackoverflow. Thanks !

  • h264 : Silence warning : comparison of distinct pointer types lacks a cast

    23 février 2013, par Michael Niedermayer

    h264 : Silence warning : comparison of distinct pointer types lacks a cast

  • Revision 80b344dec5 : Silence -Werror=unused-parameter Cast away remaining issues so that new ones do

    16 décembre 2014, par Johann

    Changed Paths :
     Modify /vp8/common/loopfilter.c


     Modify /vp8/common/postproc.c


     Modify /vp8/decoder/decodeframe.c


     Modify /vp8/decoder/decodemv.c


     Modify /vp8/decoder/onyxd_if.c


     Modify /vp8/decoder/threading.c


     Modify /vp8/encoder/encodeframe.c


     Modify /vp8/encoder/firstpass.c


     Modify /vp8/encoder/mcomp.c


     Modify /vp8/encoder/onyx_if.c


     Modify /vp8/encoder/pickinter.c


     Modify /vp8/encoder/rdopt.c


     Modify /vp8/encoder/temporal_filter.c


     Modify /vp8/vp8_cx_iface.c


     Modify /vp8/vp8_dx_iface.c


     Modify /vpxenc.c



    Silence -Werror=unused-parameter

    Cast away remaining issues so that new ones don’t get lost in the noise.

    Change-Id : Iacd6999b0686ce80f9835730d68db6382690fa92

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