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Autres articles (41)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • 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 (...)

  • List of compatible distributions

    26 avril 2011, par

    The table below is the list of Linux distributions compatible with the automated installation script of MediaSPIP. Distribution nameVersion nameVersion number Debian Squeeze 6.x.x Debian Weezy 7.x.x Debian Jessie 8.x.x Ubuntu The Precise Pangolin 12.04 LTS Ubuntu The Trusty Tahr 14.04
    If you want to help us improve this list, you can provide us access to a machine whose distribution is not mentioned above or send the necessary fixes to add (...)

Sur d’autres sites (7480)

  • Revision 4e66293fcb : Use source frame difference to make partition decision Calculate the difference

    2 avril 2014, par Yunqing Wang

    Changed Paths :
     Modify /vp9/common/vp9_rtcd_defs.pl


     Modify /vp9/encoder/vp9_encodeframe.c


     Modify /vp9/encoder/vp9_encodeframe.h


     Modify /vp9/encoder/vp9_onyx_int.h


     Modify /vp9/encoder/vp9_speed_features.c


     Modify /vp9/encoder/vp9_speed_features.h


     Modify /vp9/encoder/vp9_variance.c



    Use source frame difference to make partition decision

    Calculate the difference variance between last source frame and
    current source frame. The variance is calculated at 16x16 block
    level. The variances are compared to several thresholds to decide
    final partition sizes.

    An adaptive strategy is implemented to decide using
    SOURCE_VAR_BASED_PARTITION or FIXED_PARTITION based on motions
    in the video. The switching test is done once every
    search_type_check_frequency frames.

    The selection of source_var_thresh needs to be investigated
    further later.

    RTC set Borg test showed 0.424% overall psnr gain, and 0.357%
    ssim gain. For clips with large enough static area, the
    encoding speedup is around 2% to 15%.

    Change-Id : Id7d268f1d8cbca7fb8026aa4a53b3c77459dc156

  • What is the difference between ISO BMFF and other mp4 format ?

    26 octobre 2019, par linus wang

    As about.
    I want to play a MP4 via Media Source Extensions, but not any MP4 file can play. Please check FLV.js, it works by transmuxing FLV file stream into ISO BMFF (Fragmented MP4) segments, followed by feeding mp4 segments into an HTML5 element through Media Source Extensions API.

    So, What is the diference between ISO BMFF and other mp4 format ?

  • Why is there a difference between gpu frame extracting and CPU frame extracting using ffmpeg？

    21 octobre 2019, par corner

    I used ffmpeg for gpu frame extraction, but it was different from CPU frame extraction.

    gpu frame extraction command :

    ffmpeg -vsync 0 -hwaccel cuvid -c:v h264_cuvid -i video.mp4 -q:v 2 -vf "scale_npp=format=yuv420p,fps=25,hwdownload,format=yuv420p" -pix_fmt yuvj420p -y images/%5d.jpg

    cpu frame extraction command :

    ffmpeg -threads 1 -i video.mp4 -q:v 2 -vf fps=25 -y images/%5d.jpg

    But the results are different ?
    why ?

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