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Médias (91)

Autres articles (67)

  • Les sons

    15 mai 2013, par

  • 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) (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

Sur d’autres sites (3843)

  • ffmpeg - wrong length of video

    29 mars 2012, par Victor

    I use ffmpeg to convert a video from mp4 to flv and mpg formats. Just rough conversion with few params :

     ffmpeg -i my_file.mp4 -an -f flv my_new_file.flv

    (I don't need sound so I specified -an)

    When I convert file with 2:23 length I get 0:23 length of flv(or mpg) files. Why does that happen ?

  • http: Improve handling of Content-Range with Transfer-Encoding:chunked

    2 février 2022, par Justin Ruggles
    http: Improve handling of Content-Range with Transfer-Encoding:chunked

    When Transfer-Encoding:chunked is used, the client must ignore a
    
Content-Length header, if present. However, it should not ignore a
    
Content-Range header, which also includes the full size of the
    
entity.
    • [DH] libavformat/http.c

  • Value range for AVCodecContex::global_quality, ::compression_level and AVFrame::quality

    27 février 2019, par Bim

    I’m trying to compress video using different codecs (WMV, MP4, H264, VP8, VP9) using FFmpeg / libav. I’m unsure on how to set the global and per-frame quality values. Even the range of values is unclear to me. The docs are not helpful.
    Currently I’m using :

    AVCodecContex::global_quality = FF_QP2LAMBDA * quality; // no idea about range, default seems to be 0
    
AVCodecContex::compression_level = 0; // There is FF_COMPRESSION_DEFAULT (-1), which seems to be the default
    
AVFrame::quality = FF_LAMBDA_MAX * quality; // docs say range is [1, FF_LAMBDA_MAX], default seems to be 0

    quality is in the range [0,1], where 0 means best image quality. Only 0 seems to do anything for me and leads to ok-quality videos. All other values produce low-quality output.
    Any clarification on how to set these values is welcome.

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