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  • Pas question de marché, de cloud etc...

    10 avril 2011

    Le vocabulaire utilisé sur ce site essaie d’éviter toute référence à la mode qui fleurit allègrement
    sur le web 2.0 et dans les entreprises qui en vivent.
    Vous êtes donc invité à bannir l’utilisation des termes "Brand", "Cloud", "Marché" etc...
    Notre motivation est avant tout de créer un outil simple, accessible à pour tout le monde, favorisant
    le partage de créations sur Internet et permettant aux auteurs de garder une autonomie optimale.
    Aucun "contrat Gold ou Premium" n’est donc prévu, aucun (...)

  • 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 (...)

  • 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.
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  • HLS to MPEG DASH

    15 avril 2018, par Maximilian

    Im currently working on a platform that relies on MPEG Dash to deliver audio and video to the browser.
    For onDemand im using ffmpeg to encode videos to h264/aac and MP4Box to create the manifest.mpd file.
    Now im trying to figure out how to create live MPEG Dash streams, more specifically encode hls live streams to MPEG Dash.

    1. Do i need to reencode all the .ts segments to .mp4(h264/aac) segments, since chrome doesnt support mpeg2ts ?
    2. If so, how do i continuously reencode all the segments (different resolution, different bitrates)
    3. How do i create a dynamic manifest with MP4Box / how would the input parameter look like

  • MPEG DASH : frame seeking

    13 août 2014, par bisc8

    TL ;DR : Is it possible to achieve frame seeking using DASH ? How ?

    I’m using ffmpeg to create non-multiplexed content :

    ffmpeg -y -an -codec:v libx264 -profile:v baseline output_video.mp4 -i video.mp4
    
ffmpeg -y -vn -codec:a libvo_aacenc -ac 1 -ar 44100 output_audio.mp4 -i video.mp4

    Then I’m using mp4box to create DASH content :

    mp4box -dash 10000 -frag 1000 -rap -dash-profile live -segment-name mp4-live-$RepresentationID$-$Number$ -out manifest.mpd output_video.mp4 output_audio.mp4

    Finally I open the generated content with Chrome, using dash.js. Everything works fine except that I can’t do frame seek. I keep on adding (1/frame_rate) seconds to the current time but nothing happens, the frame only changes after 10 seconds.

    I suppose this has to do with the video’s key interval. However, I am able to do frame seek after the ffmpeg part, so I guess I’m missing something in the mp4box command.

    Is it possible to achieve frame seeking using DASH or am I missing something ?

    Thanks in advance.

  • FFMPEG Dash with tiles of thumbnail images

    31 juillet 2020, par martyn Gilbert

    As of DASH-IF IOP version 4.2, section 6.2.6 defines the notion of image-based tracks in DASH :
https://dashif.org/docs/DASH-IF-IOP-v4.3.pdf.

    



    This is the ability to have an adaption set made up of mime type images that themselves are a strip of low resolution thumbnails. 
A player will use these thumbnails when the user hovers their mouse over the video timeline and get a 
preview of the the frame at that approximate timecode.

    



    Theo player website has a page dedicated to this function for playback :
https://www.theoplayer.com/blog/in-stream-thumbnail-support-dvr-dash-streams

    



    I need to generate a dash stream (not live) using ffmpeg that also contains these thumbnails. 
I already have an ffmpeg command that will generate the film strip of jpgs which outputs a thumbnail every 5 seconds of input video and joins 5 of these together in a single jpg :

    



    ffmpeg -i INPUT -q:v 20 -vf "select=not(mod(n\,125)),scale=480:270,tile=5x1" -vsync vfr output%d.jpg

    



    and the mpeg dash itself :

    



    ffmpeg -i INPUT -y -map 0 -acodec aac -ac 2 -ar 48000 -s 960x540 -vcodec libx264 -f dash -preset veryfast -b:v:2 1500k -seg_duration 2 output.mpd

    



    But I cannot find a way in ffmpeg to include the thumbnails in the dash mpd file.

    


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