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Autres articles (104)

  • 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 (...)

  • Les formats acceptés

    28 janvier 2010, par

    Les commandes suivantes permettent d’avoir des informations sur les formats et codecs gérés par l’installation local de ffmpeg :
    ffmpeg -codecs ffmpeg -formats
    Les format videos acceptés en entrée
    Cette liste est non exhaustive, elle met en exergue les principaux formats utilisés : h264 : H.264 / AVC / MPEG-4 AVC / MPEG-4 part 10 m4v : raw MPEG-4 video format flv : Flash Video (FLV) / Sorenson Spark / Sorenson H.263 Theora wmv :
    Les formats vidéos de sortie possibles
    Dans un premier temps on (...)

  • Gestion de la ferme

    2 mars 2010, par

    La ferme est gérée dans son ensemble par des "super admins".
    Certains réglages peuvent être fais afin de réguler les besoins des différents canaux.
    Dans un premier temps il utilise le plugin "Gestion de mutualisation"

Sur d’autres sites (5482)

  • avfilter/af_dynaudnorm : allocate new frame instead of making it writable

    27 février 2022, par Paul B Mahol
    avfilter/af_dynaudnorm : allocate new frame instead of making it writable

    Later case does not use frame pool at all.
    • [DH] libavfilter/af_dynaudnorm.c

  • Revision 2726f383cd : Adding allow_hp as an argument to mv search functions. Making this change in or

    17 octobre 2013, par Dmitry Kovalev

    Changed Paths :
     Modify /vp9/encoder/vp9_mbgraph.c


     Modify /vp9/encoder/vp9_mcomp.c


     Modify /vp9/encoder/vp9_mcomp.h


     Modify /vp9/encoder/vp9_rdopt.c


     Modify /vp9/encoder/vp9_temporal_filter.c



    Adding allow_hp as an argument to mv search functions.

    Making this change in order to move allow_high_precision_mv field
    from MACROBLOCKD structure to VP9_COMMON (because it is a frame level
    flag).

    Change-Id : I1d006ba36d938e0caf4d40fa051e2e38df9c1108

  • Making changes on a video before a download [on hold]

    1er février 2016, par Chris Russo

    We have a website with lots of videos (>10,000) and lots of users (>50,000). Each video might be around 1,2 Gbs.

    The goal is to generate a unique video for each one of the members or users of the website making a small variation either on the audio track of the video, or the keyframes on the video itself, using low frequency beeps, or a few random pixels on specific keyframes.

    I understand that this operation can be done using SoX for the audio track, or FFmpeg in the case of the video, manipulating the keyframes.

    Here’s my question, as we have to choose between 2 options at this point :

    In terms of resources : would it be convenient or even possible to generate in real time a clone of the video and make this variations at the moment that the user’s request the download (please considerate the big volume of videos and users).

    Or it would be convenient to face this problem using HDD, pre-generating and storing the already manipulated videos ready to be served ?

    I understand that storing all this data will require a few many Tera’s but I’m not sure about how much RAM and Microprocessing could be demanded to perform this operations in real time, over videos that might be as big as 1Gbs.

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