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  • 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 (...)

  • Personnaliser les catégories

    21 juin 2013, par

    Formulaire de création d’une catégorie
    Pour ceux qui connaissent bien SPIP, une catégorie peut être assimilée à une rubrique.
    Dans le cas d’un document de type catégorie, les champs proposés par défaut sont : Texte
    On peut modifier ce formulaire dans la partie :
    Administration > Configuration des masques de formulaire.
    Dans le cas d’un document de type média, les champs non affichés par défaut sont : Descriptif rapide
    Par ailleurs, c’est dans cette partie configuration qu’on peut indiquer le (...)

  • HTML5 audio and video support

    13 avril 2011, par

    MediaSPIP uses HTML5 video and audio tags to play multimedia files, taking advantage of the latest W3C innovations supported by modern browsers.
    The MediaSPIP player used has been created specifically for MediaSPIP and can be easily adapted to fit in with a specific theme.
    For older browsers the Flowplayer flash fallback is used.
    MediaSPIP allows for media playback on major mobile platforms with the above (...)

Sur d’autres sites (12321)

  • How to use custom function to calculate 'x' in ffmpeg crop

    17 septembre 2016, par Sasha Kastsiushkin

    ffmpeg docs have this example :

    crop=in_w/2:in_h/2:(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10):(in_h-out_h)/2 +((in_h-out_h)/2)*sin(n/7)

    To make it simpler, I will use named params and only affect output width and position x
    crop=w=in_w/3:x=(in_w-out_w)/2+((in_w-out_w)/2)*sin(n/10)

    The result will be the video that is 3 times shorter than original and it will ’float’ along the x axis thanks to that sin(n/10) function. x is evaluated for each frame and n(number of the input frame) will increase and change the x position dynamically.

    I’m trying to create a custom function, which will take n or t and based on it return some value of x.

    Please help me or perhaps this is not possible. I was trying to create a small bash script, which will do so unsuccessfully.

    Thank you

  • Revision 4ac6a2552b : Moving vp9_tree_probs_from_distribution() to encoder. Writing custom coeff bran

    6 décembre 2013, par Dmitry Kovalev

    Changed Paths :
     Modify /vp9/common/vp9_entropy.c


     Delete /vp9/common/vp9_treecoder.c


     Modify /vp9/common/vp9_treecoder.h


     Modify /vp9/encoder/vp9_treewriter.c


     Modify /vp9/encoder/vp9_treewriter.h


     Modify /vp9/vp9_common.mk



    Moving vp9_tree_probs_from_distribution() to encoder.

    Writing custom coeff branch count calculation (which is much clearer) in
    adapt_coef_probs() function. Removing vp9_treecoder.c file.

    Change-Id : I8880fb7a39996c8bcf6cd0acf9898a8c712ba91f

  • Cutting HEVC video results in parts stating with no video (black image) but correct audio for a few seconds

    8 juin 2020, par Oliver

    i have large HEVC video files and want to cut out parts of them. I use ffmpeg for that with the following command :

    



    ffmpeg -i input.mp4 -ss 01:18:47.040 -c:v copy -c:a copy -to 01:18:42.640 output.mp4


    



    i know that there can be problems when copy is used and no re-encoding, that is why i checked before that the frames specified in the -ss and -to parameters where keyframes (i-frames).

    



    So iam expecting to get a clean cut at the beginning and at the end. But what i get is 10 seconds of black image with normal audio in the beginning until the video starts. To make this clear : 10 seconds of video are missing in the beginning but the audio is fine.

    



    Btw : when moving the -ss part before the -i there seem to be no problems with the video (at least in the beginning). I know about the differences of putting -ss before and after the -i, but i also know, that using -ss after the -i should be slower (and was more accurate in the past) but should not make any differences in the final result. That is why I am so irritated.

    


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