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  • 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 (...)

  • Installation en mode ferme

    4 février 2011, par

    Le mode ferme permet d’héberger plusieurs sites de type MediaSPIP en n’installant qu’une seule fois son noyau fonctionnel.
    C’est la méthode que nous utilisons sur cette même plateforme.
    L’utilisation en mode ferme nécessite de connaïtre un peu le mécanisme de SPIP contrairement à la version standalone qui ne nécessite pas réellement de connaissances spécifique puisque l’espace privé habituel de SPIP n’est plus utilisé.
    Dans un premier temps, vous devez avoir installé les mêmes fichiers que l’installation (...)

  • Script d’installation automatique de MediaSPIP

    25 avril 2011, par

    Afin de palier aux difficultés d’installation dues principalement aux dépendances logicielles coté serveur, un script d’installation "tout en un" en bash a été créé afin de faciliter cette étape sur un serveur doté d’une distribution Linux compatible.
    Vous devez bénéficier d’un accès SSH à votre serveur et d’un compte "root" afin de l’utiliser, ce qui permettra d’installer les dépendances. Contactez votre hébergeur si vous ne disposez pas de cela.
    La documentation de l’utilisation du script d’installation (...)

Sur d’autres sites (8906)

  • Should I use the MP3 or AAC codec for a .mp4 file ?

    4 février 2023, par Justin Jenkins

    We have an encoding process in place using ffmpeg on Mac OS X. This process will take a source video and a couple files from that : .m3u8 video, .mp4 video and .mp3 audio file.

    



    By default we've used the video from our m3u8 process which is a h264 (via libx264) video with AAC (via libfaac) audio.

    



    We are mostly using these videos on mobile devices (hence the m3u8 files) but we also use the .mp4 files for Android, Windows Phone, etc. More and more we also need to offer these same videos on the web via either a flash player or HTML5 player.

    



    Therefore, we'd like to have the best audio/video codec combo for all these uses ... where I'm confused is to what is "standard" for a .mp4 file ?

    



    If the .mp4 uses the mp3 codec then it plays just fine everywhere but QuickTime, in QuickTime the video plays but there is not audio (works just fine in VLC player tho.)

    



    I've been told it's due to how QuickTime uses file extensions to assume information about the video instead of trying to actually get the codec data from the file ? This does make some sense, if we encode the same file but use AAC for the audio codec then it works just fine in QuickTime.

    



    So --- what's the "correct" or "ideal" audio/video codec combo --- is it best and safe to use AAC (i.e. will it work on a broad range of devices) even though it's not a "free" codec ?

    


  • Should I use the MP3 or AAC codec for a .mp4 file ?

    8 novembre 2014, par Justin Jenkins

    We have an encoding process in place using ffmpeg on Mac OS X. This process will take a source video and a couple files from that : .m3u8 video, .mp4 video and .mp3 audio file.

    By default we’ve used the video from our m3u8 process which is a h264 (via libx264) video with AAC (via libfaac) audio.

    We are mostly using these videos on mobile devices (hence the m3u8 files) but we also use the .mp4 files for Android, Windows Phone, etc. More and more we also need to offer these same videos on the web via either a flash player or HTML5 player.

    Therefore, we’d like to have the best audio/video codec combo for all these uses ... where I’m confused is to what is "standard" for a .mp4 file ?

    If the .mp4 uses the mp3 codec then it plays just fine everywhere but QuickTime, in QuickTime the video plays but there is not audio (works just fine in VLC player tho.)

    I’ve been told it’s due to how QuickTime uses file extensions to assume information about the video instead of trying to actually get the codec data from the file ? This does make some sense, if we encode the same file but use AAC for the audio codec then it works just fine in QuickTime.

    So --- what’s the "correct" or "ideal" audio/video codec combo --- is it best and safe to use AAC (i.e. will it work on a broad range of devices) even though it’s not a "free" codec ?

  • flv to mp4 using ffmpeg cli on debian

    18 février 2015, par mickeywilko

    I’m trying to convert this flv file into .mp4 using ffmpeg on debian.

    • Stream 0 Type : Video Codec : Flash Video (FLV1) Resolution : 640x480
      Frame rate : 1000 Decoded format : Planar 4:2:0 YUV

      Stream 1 Type : Audio Codec : NellyMoser ASAO (NELL) Channels : Mono
      Sample rate : 22050 Hz Bits per sample : 32

    I’m currently using this simple command...

    sudo avconv -i videoStream_1424268207948_854.flv videoStream_1424268207948_854.mp4

    These are the warnings I receive :

    • [flv @ 0x14fab20] Estimating duration from bitrate, this may be inaccurate
    • [libx264 @ 0x14fdaa0] MB rate (1200000) > level limit (983040)
    • Multiple frames in a packet from stream 0
    • [flv @ 0x14fca60] Bad picture start code
    • [flv @ 0x14fca60] header damaged
    • Error while decoding stream #0:0

    ... and it results in messed up video and audio.

    Can anyone help with some parameters ?

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