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  • 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 (...)

  • Support audio et vidéo HTML5

    10 avril 2011

    MediaSPIP utilise les balises HTML5 video et audio pour la lecture de documents multimedia en profitant des dernières innovations du W3C supportées par les navigateurs modernes.
    Pour les navigateurs plus anciens, le lecteur flash Flowplayer est utilisé.
    Le lecteur HTML5 utilisé a été spécifiquement créé pour MediaSPIP : il est complètement modifiable graphiquement pour correspondre à un thème choisi.
    Ces technologies permettent de distribuer vidéo et son à la fois sur des ordinateurs conventionnels (...)

  • 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 (...)

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  • Orientation issue with mobile recordings

    18 mai 2012, par Kim Egede Jakobsen

    When I convert .mov files from iPhone 4 and .3gp from Android with FFMPEG.
    I need to rotate the video 90 degress, but iPhone 4s needs 180 degress...

    Is there any way to fix this ?

  • ffmpeg iOS and SDL2

    24 décembre 2015, par user3487978

    I created a app for iPhone, the core source is based on the latest ffplay.c, I just changed the rendering part to support iOS, general it can play video, but I found the quality is not as good as enough, see screenshot below, the first image is the what expected, the second is image that my app on iPhone produced, and the last the produced by my app on iPad.
    on the iPhone’s image, you can found there is a dash line, and the colour is not correct, it seems that there is a shadow of the image.
    I am new to ffmpeg, can anyone help me what is the problem

  • Why is one ffmpeg webm dash stream much larger than the others ?

    5 janvier 2017, par ranvel

    Over the summer, I worked on putting together a script which took a x264 video/mp3 stream and broke it up into the different streams so that it would work via MSE-DASH. (Based heavily on the instructions on the webmproject.org website) Those same scripts have ceased to work, turning a 6GB video into several 25 Gb videos. I kept up with updates of ffmpeg and so I don’t know when it stopped working, but I am guessing it was due to the way that their DASH Webm implementation was updated.

    I found new method which works better, but still has a major problem with one stream. I was hoping someone could explain how this encoding works so that I could understand the underlying cause.

    #!/bin/bash
    
COMMON_OPTS="-map 0:0 -an -threads 11 -cpu-used 4 -cmp chroma"
    
WEBM_OPTS="-f webm -c:v vp9 -keyint_min 50 -g 50 -dash 1"
    

    
ffmpeg -i $1 -vn -acodec libvorbis -ab 128k audio.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 500k -vf scale=1280:720 -y vid-500k.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 700k -vf scale=1280:720 -y vid-700k.webm & 
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1000k -vf scale=1280:720 -y vid-1000k.webm &
    
ffmpeg -i $1 $COMMON_OPTS $WEBM_OPTS -b:v 1500k -vf scale=1280:720 -y vid-1500k.webm  

    The transcode is not yet complete, but you can see where this is headed :

    -rw-r--r--  1 user  staff    87M Jan  4 23:27 audio.webm
    
-rw-r--r--  1 user  staff    27M Jan  4 23:42 vid-1000k.webm
    
-rw-r--r--  1 user  staff   285M Jan  4 23:42 vid-1500k.webm
    
-rw-r--r--  1 user  staff    15M Jan  4 23:42 vid-500k.webm
    
-rw-r--r--  1 user  staff    20M Jan  4 23:42 vid-700k.webm

    The 1500k variant is disproportionately larger than the other streams.

    The other problem is that when I use a shorter video, lets say eight or nine minutes, the above configuration runs as expected and everything is perfect. I don’t know where the limit for this is since each test costs a lot of processing power and time, but if it’s less than ten minutes, it works and if its longer than an hour, it produces massive files.

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