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Mot : - Tags -/Christian Nold

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  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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 (...)

  • Submit enhancements and plugins

    13 avril 2011

    If you have developed a new extension to add one or more useful features to MediaSPIP, let us know and its integration into the core MedisSPIP functionality will be considered.
    You can use the development discussion list to request for help with creating a plugin. As MediaSPIP is based on SPIP - or you can use the SPIP discussion list SPIP-Zone.

Sur d’autres sites (11005)

  • 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.

  • Finding the length of a video in Java and ffmpeg

    17 avril 2015, par Abishek R Srikaanth

    Is there a way to find a length of a video using Java ? I understand we can make use of ffmpeg to generated thumbnails and encode videos. But can it be used to get the length of the video ?

    Thanks and Regards
    Abishek R Srikaanth

  • FFMPEG - How to trim video to length of 200 ms

    26 décembre 2018, par David C

    I am trying to trim a video with clips as short as 100 ms or 200 ms length (so I can merge them together later). They always end up at least about 1 second. I guess there is a minimum length, but i wonder if it is possible to still manage to get shorter videos.

    I have tried this on Windows with the most recent version of ffmpeg :

    ffmpeg -i video.mp4 -ss 00:00:01.700 -t 00:00:01.715 output.mp4

    I expect a video of the length of around 200 ms. Alternatively maybe there is a way to trim multiple clips and merge them directly into an output file.

    Thanks !

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