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Autres articles (61)

  • La file d’attente de SPIPmotion

    28 novembre 2010, par

    Une file d’attente stockée dans la base de donnée
    Lors de son installation, SPIPmotion crée une nouvelle table dans la base de donnée intitulée spip_spipmotion_attentes.
    Cette nouvelle table est constituée des champs suivants : id_spipmotion_attente, l’identifiant numérique unique de la tâche à traiter ; id_document, l’identifiant numérique du document original à encoder ; id_objet l’identifiant unique de l’objet auquel le document encodé devra être attaché automatiquement ; objet, le type d’objet auquel (...)

  • ANNEXE : Les plugins utilisés spécifiquement pour la ferme

    5 mars 2010, par

    Le site central/maître de la ferme a besoin d’utiliser plusieurs plugins supplémentaires vis à vis des canaux pour son bon fonctionnement. le plugin Gestion de la mutualisation ; le plugin inscription3 pour gérer les inscriptions et les demandes de création d’instance de mutualisation dès l’inscription des utilisateurs ; le plugin verifier qui fournit une API de vérification des champs (utilisé par inscription3) ; le plugin champs extras v2 nécessité par inscription3 (...)

  • Ajouter des informations spécifiques aux utilisateurs et autres modifications de comportement liées aux auteurs

    12 avril 2011, par

    La manière la plus simple d’ajouter des informations aux auteurs est d’installer le plugin Inscription3. Il permet également de modifier certains comportements liés aux utilisateurs (référez-vous à sa documentation pour plus d’informations).
    Il est également possible d’ajouter des champs aux auteurs en installant les plugins champs extras 2 et Interface pour champs extras.

Sur d’autres sites (7378)

  • Transcoding fMP4 to HLS while writing on iOS using FFmpeg

    12 juillet 2017, par bclymer

    TL ;DR

    I want to convert fMP4 fragments to TS segments (for HLS) as the fragments are being written using FFmpeg on an iOS device.

    Why ?

    I’m trying to achieve live uploading on iOS while maintaining a seamless, HD copy locally.

    What I’ve tried

    1. Rolling AVAssetWriters where each writes for 8 seconds, then concatenating the MP4s together via FFmpeg.

      What went wrong - There are blips in the audio and video at times. I’ve identified 3 reasons for this.

      1) Priming frames for audio written by the AAC encoder creating gaps.

      2) Since video frames are 33.33ms long, and audio frames 0.022ms long, it’s possible for them to not line up at the end of a file.

      3) The lack of frame accurate encoding present on Mac OS, but not available for iOS Details Here

    2. FFmpeg muxing a large video only MP4 file with raw audio into TS segments. The work was based on the Kickflip SDK

      What Went Wrong - Every once in a while an audio only file would get uploaded, with no video whatsoever. Never able to reproduce it in-house, but it was pretty upsetting to our users when they didn’t record what they thought they did. There were also issues with accurate seeking on the final segments, almost like the TS segments were incorrectly time stamped.

    What I’m thinking now

    Apple was pushing fMP4 at WWDC this year (2016) and I hadn’t looked into it much at all before that. Since an fMP4 file can be read, and played while it’s being written, I thought that it would be possible for FFmpeg to transcode the file as it’s being written as well, as long as we hold off sending the bytes to FFmpeg until each fragment within the file is finished.

    However, I’m not familiar enough with the FFmpeg C API, I only used it briefly within attempt #2.

    What I need from you

    1. Is this a feasible solution ? Is anybody familiar enough with fMP4 to know if I can actually accomplish this ?
    2. How will I know that AVFoundation has finished writing a fragment within the file so that I can pipe it into FFmpeg ?
    3. How can I take data from a file on disk, chunk at a time, pass it into FFmpeg and have it spit out TS segments ?

  • Transcoding fMP4 to HLS while writing on iOS using FFmpeg

    29 avril 2017, par bclymer

    TL ;DR

    I want to convert fMP4 fragments to TS segments (for HLS) as the fragments are being written using FFmpeg on an iOS device.

    Why ?

    I’m trying to achieve live uploading on iOS while maintaining a seamless, HD copy locally.

    What I’ve tried

    1. Rolling AVAssetWriters where each writes for 8 seconds, then concating the MP4s together via FFmpeg.

      What went wrong - There are blips in the audio and video at times. I’ve identified 3 reasons for this.

      1) Priming frames for audio written by the AAC encoder creating gaps.

      2) Since video frames are 33.33ms long, and audio frames 0.022ms long, it’s possible for them to not line up at the end of a file.

      3) The lack of frame accurate encoding present on Mac OS, but not available for iOS Details Here

    2. FFmpeg muxing a large video only MP4 file with raw audio into TS segments. The work was based off the Kickflip SDK

      What Went Wrong - Every once in a while an audio only file would get uploaded, with no video whatsoever. Never able to reproduce it in-house, but it was pretty upsetting to our users when they didn’t record what they thought they did. There were also issues with accurate seeking on the final segments, almost like the TS segments were incorrectly time stamped.

    What I’m thinking now

    Apple was pushing fMP4 at WWDC this year (2016) and I hadn’t looked into it much at all before that. Since an fMP4 file can be read, and played while it’s being written, I thought that it would be possible for FFmpeg to transcode the file as it’s being written as well, as long as we hold off sending the bytes to FFmpeg until each fragment within the file is finished.

    However, I’m not familiar enough with the FFmpeg C API, I only used it briefly within attempt #2.

    What I need from you

    1. Is this a feasible solution ? Is anybody familiar enough with fMP4 to know if I can actually accomplish this ?
    2. How will I know that AVFoundation has finished writing a fragment within the file so that I can pipe it into FFmpeg ?
    3. How can I take data from a file on disk, chunk at a time, pass it into FFmpeg and have it spit out TS segments ?

  • FFMPEG install on server

    23 juillet 2013, par s19k15

    I have an online server (shared hosting plan) in linux, i do not know a lot stuff about linux and i am trying to install ffmpeg.

    I have tryied a lot of scripts but no luck.
    Now i am trying to install the below script via putty.
    <a href="https://github.com/heidisoft/FFMPEG-install-script-for-shared-host" rel="nofollow">https://github.com/heidisoft/FFMPEG-install-script-for-shared-host</a>

    When the install was running i get this message and the installation stops...

    Installation of MPlayer-1.0rc1.tar.bz2 ....... started
    
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
    
                                 Dload  Upload   Total   Spent    Left  Speed
    
100  1233  100  1233    0     0   7713      0 --:--:-- --:--:-- --:--:--  7803
    
bzip2: (stdin) is not a bzip2 file.
    
tar: Child returned status 2
    
tar: Error is not recoverable: exiting now
    
mplayer.sh: line 32: cd: MPlayer-1.0rc1/: No such file or directory
    
mplayer.sh: line 33: ./configure: No such file or directory
    
make: *** No targets specified and no makefile found.  Stop.
    
make: *** No rule to make target `install&#39;.  Stop.
    
cp: cannot stat `etc/codecs.conf&#39;: No such file or directory
    
Installation of MPlayer-1.0rc1.tar.bz2 ....... Completed
    

    
        Mplayer installation Failed :( , please visit the forum

    What can i do to install ??? Thanks !

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