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Médias (91)

Autres articles (72)

  • 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 (...)

  • Librairies et logiciels spécifiques aux médias

    10 décembre 2010, par

    Pour un fonctionnement correct et optimal, plusieurs choses sont à prendre en considération.
    Il est important, après avoir installé apache2, mysql et php5, d’installer d’autres logiciels nécessaires dont les installations sont décrites dans les liens afférants. Un ensemble de librairies multimedias (x264, libtheora, libvpx) utilisées pour l’encodage et le décodage des vidéos et sons afin de supporter le plus grand nombre de fichiers possibles. Cf. : ce tutoriel ; FFMpeg avec le maximum de décodeurs et (...)

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

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  • Converting youtube videos to mp3 in golang using a ffmpeg binary

    19 août 2015, par Bera

    With golang it’s possible to extract a mp3 file from a given youtube video url ?

    Is needed to download a video in mp4 format and then extract the audio in the mp3 format.

    Would be better to use a lib like youtube-dl to download the video in mp4 and after invoke a ffmpeg binary to extract the audio or there is a easy way using only go libraries or binds ?

    thanks for your help.

  • ffmpeg how to extract X frames every Y interval from url efficiently

    13 décembre 2018, par Luay Gharzeddine

    I’m trying to gather data for a datascience project, and am downloading frames from online videos using ffmpeg. I want to download a subset of the frames in the video, without needing to be precise about which, the only requirement is that they are reasonably spaced apart from each other.

    I have tried

    ffmpeg -i "http://www.somevideo.com" -r 1 -f image2 "image%06d.jpg"

    and

    ffmpeg -i "http://www.somevideo.com" -vf fps=1 "image%06d.jpg"

    and eventually found the following method

    ffmpeg -ss offset1 -i "http://www.somevideo.com" -ss offset2 -i "http://www.somevideo.com" -map 0:v -frames:v 10 -start_number 0 "image%06d.jpg" -map 1:v -frames:v 10 -start_number 10 "image%06d.jpg"

    and all work, but are slow. I have found a hack where I run the following command multiple times, at different offsets, and it seems to be the fastest (where each ffmpeg command is run in parallel multithreaded)

    ffmpeg -ss offset -i "http://www.somevideo.com" -vframes frames_per_fragment -an -start_number start_index "image%06d.jpg"

    this about 25% faster than the previous method

    Is there a faster way to do this ? The issue is that downloading over a network is a bottleneck, so I want to download only the frames I need. I’m looking to download videos/frames in bulk, so any speed improvement would be helpful.

  • How to build SDL libraries for Android

    4 mars 2013, par Harish

    I am planning to use SDL (Simple DirectMedia Layer) to display video output in my Android application that uses ffmpeg libraries. I have downloaded the sources from http://www.libsdl.org/download-1.2.php and built (./configure, make & make install) on my Ubuntu. But when I use these .so files the Android ndk-build complains that "Could not read symbols. File in wrong Format".

    Can I use the .so files that are built on Ubuntu on Android or do I need to build the SDL for Android in a different way ?

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