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  • Le plugin : Podcasts.

    14 juillet 2010, par

    Le problème du podcasting est à nouveau un problème révélateur de la normalisation des transports de données sur Internet.
    Deux formats intéressants existent : Celui développé par Apple, très axé sur l’utilisation d’iTunes dont la SPEC est ici ; Le format "Media RSS Module" qui est plus "libre" notamment soutenu par Yahoo et le logiciel Miro ;
    Types de fichiers supportés dans les flux
    Le format d’Apple n’autorise que les formats suivants dans ses flux : .mp3 audio/mpeg .m4a audio/x-m4a .mp4 (...)

  • 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 (...)

  • XMP PHP

    13 mai 2011, par

    Dixit Wikipedia, XMP signifie :
    Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
    Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
    XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...)

Sur d’autres sites (8345)

  • MPEG-DASH create initialization segment

    3 novembre 2014, par static

    I’m segmenting the video capture of the desktop using ffmpeg -segment and sending them over network in order to be served to clients and to be played using dash.js. The problem is that the player is searching for the initialization segment and i don’t seem to be able to figure out how to create it.
    I create the segments using this ffmpeg command :

    ffmpeg -rtbufsize 1500M -f dshow -r 15 -i video="UScreenCapture"
    
-flags +global_header -vcodec libvpx -crf 10 -quality good -keyint_min 15 -g 15
    
-cpu-used 3 -b:v 1000k -qmin 10 -qmax 42  -threads 2 -vf scale=-1:480 -bufsize 1
    
500 -map 0 -f stream_segment -segment_time 2 -segment_format webm http://localho
    
st:3000/stream/22/%03d

    The manifest that i create for the stream looks something like this :

    <mpd xmlns="urn:mpeg:dash:schema:mpd:2011" type="dynamic" availabilitystarttime="2014-06-19T07:47:40.079Z" minbuffertime="PT0S" profiles="urn:mpeg:dash:profile:isoff-live:2011" suggestedpresentationdelay="PT40S" maxsegmentduration="PT2.000S" minimumupdateperiod="PT1000M">
    
<period bitstreamswitching="true" start="PT0S">
    
<adaptationset mimetype="video/webm" segmentalignment="true" startwithsap="1" maxwidth="1280" maxheight="720" maxframerate="15">
    
<contentcomponent contenttype="video"></contentcomponent>
    
<segmenttemplate presentationtimeoffset="0" timescale="90000" media="$Number$/" duration="180000" startnumber="0"></segmenttemplate>
    
<representation width="853" height="480" framerate="15" bandwidth="1000000" codecs="vp8"></representation>
    
</adaptationset>
    
</period>
    
</mpd>

    The player debugging mode prints the following things :

    Getting the request for time: 0 dash.all.js:2073
    
Index for time 0 is 0 dash.all.js:2073
    
Waiting for more video buffer before starting playback. dash.all.js:2073
    
BufferController video seek: 0 dash.all.js:2073
    
Marking a special seek for initial video playback. dash.all.js:2073
    
Start searching for initialization. dash.all.js:2073
    
Perform init search: stream/22/ dash.all.js:2073
    
Getting the request for time: 0 dash.all.js:2073
    
Index for time 0 is 0 dash.all.js:2073
    
Data changed - loading the video fragment for time: 0 dash.all.js:2073
    
Getting the request for time: 0

    How can i create the initialization segment for the generated segments ? I can’t seem to be able to get it to work.

  • Live WebRTC streams (getUserMedia) to DASH using WebM

    4 septembre 2015, par cyp

    I’m trying to understand the feasibility of a live streaming solution.
    I want to grab WebRTC streams (audio and video), send them to a server and transform them in chunks to send to a html5 video tag or a DASH player using WebM container (VP8 and Opus codecs).

    I also looked into ffmpeg, ffserver and gstreamer but...

    My question is how to feed the WebRTC streams (live) and transform them in HTTP chunks (live DASH compatible) ?

    Anyone achieved something like this ?

  • Live WebRTC streams (getUserMedia) to DASH using WebM

    3 avril 2023, par cyp

    I'm trying to understand the feasibility of a live streaming solution. &#xA;I want to grab WebRTC streams (audio and video), send them to a server and transform them in chunks to send to a html5 video tag or a DASH player using WebM container (VP8 and Opus codecs).

    &#xA;&#xA;

    I also looked into ffmpeg, ffserver and gstreamer but...

    &#xA;&#xA;

    My question is how to feed the WebRTC streams (live) and transform them in HTTP chunks (live DASH compatible) ?

    &#xA;&#xA;

    Anyone achieved something like this ?

    &#xA;

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