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  • MediaSPIP Core : La Configuration

    9 novembre 2010, par

    MediaSPIP Core fournit par défaut trois pages différentes de configuration (ces pages utilisent le plugin de configuration CFG pour fonctionner) : une page spécifique à la configuration générale du squelettes ; une page spécifique à la configuration de la page d’accueil du site ; une page spécifique à la configuration des secteurs ;
    Il fournit également une page supplémentaire qui n’apparait que lorsque certains plugins sont activés permettant de contrôler l’affichage et les fonctionnalités spécifiques (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

  • Use, discuss, criticize

    13 avril 2011, par

    Talk to people directly involved in MediaSPIP’s development, or to people around you who could use MediaSPIP to share, enhance or develop their creative projects.
    The bigger the community, the more MediaSPIP’s potential will be explored and the faster the software will evolve.
    A discussion list is available for all exchanges between users.

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  • Easy Tricks for Finding WebM Videos in YouTube

    9 août 2010, par noreply@blogger.com (John Luther)

    Since the WebM project launch, YouTube has been encoding videos uploaded at 720p or higher resolution in the WebM format. Today, the one million most popular videos of any size on YouTube are also available in the WebM format.

    We have instructions on our project site for finding these videos but they require adding a special parameter onto the end of each search query. All of the browsers that support WebM can create search shortcuts with custom parameters, however, so we’ve compiled instructions for making it very simple to search for WebM videos in YouTube.

    Important : First, make sure you have a supported browser and are enrolled in the YouTube HTML5 beta by going to http://youtube.com/html5 and clicking Enter the HTML5 Beta.

    Creating a WebM Search Shortcut

    Firefox 4 Beta :

    1. Select Bookmarks > Organize Bookmarks. A bookmark manager dialog opens.
    2. In the left column, choose a location for the new bookmark you’re creating. Next, choose Organize > New Bookmark (on MacOS click the gear icon). The new bookmark dialog opens.
    3. In the Name box, type WebM.
    4. In the Location box, type http://youtube.com/results?search_query=%s&webm=1.
    5. In the Keyword box, type webm.
    6. Click Add.

    Google Chrome Early Release Channel :

    1. On Windows and Linux, click the Chrome wrench icon in the toolbar and select Options. On MacOS, select Chrome > Preferences.
    2. On the Basics tab, click the Manage button in the Default Search section.
    3. On Windows and Linux, click Add. On MacOS X, click the plus (+) button.
    4. In the Name box, type WebM.
    5. In the Keyword box, type webm.
    6. In the URL box, type http://youtube.com/results?search_query=%s&webm=1.
    7. Click OK.

    Opera 10.60 and later :

    1. Go to http://youtube.com.
    2. Right-click in the YouTube search box at the top of the page and select Create Search. On MacOS, use Ctrl+click if you don’t a secondary mouse button enabled.
    3. In the Name box, type WebM.
    4. In the Keyword box, type webm.
    5. In the Address box, type http://youtube.com/results?search_query=%s&webm=1.
    6. Click OK.



    Now you’re ready to search. In the location box of the browser, type webm monster trucks. The YouTube search results page will open with a selection of monster truck videos encoded in the WebM format. When watching a video, look for the HTML5 WebM indicator in the player control bar.

    If you can’t find WebM videos it is most likely a browser cookie problem. Your enrollment in the YouTube HTML5 beta test is stored in a browser cookie (not in your YouTube or Google account), and that cookie can expire. Visit http://youtube.com/html5 and opt-in again to re-set the cookie.

    Directly Accessing WebM Videos by URL

    To find out if any YouTube video is available in WebM, simply add &html5=True (make sure True is capitalized) to the end of the video URL. If there is a WebM version of the video, it will open instead of the Flash version. For example :

  • Easy Tricks for Finding WebM Videos in YouTube

    9 août 2010, par noreply@blogger.com (John Luther)

    Since the WebM project launch, YouTube has been encoding videos uploaded at 720p or higher resolution in the WebM format. Today, the one million most popular videos of any size on YouTube are also available in the WebM format.

    We have instructions on our project site for finding these videos but they require adding a special parameter onto the end of each search query. All of the browsers that support WebM can create search shortcuts with custom parameters, however, so we’ve compiled instructions for making it very simple to search for WebM videos in YouTube.

    Important : First, make sure you have a supported browser and are enrolled in the YouTube HTML5 beta by going to http://youtube.com/html5 and clicking Enter the HTML5 Beta.

    Creating a WebM Search Shortcut

    Firefox 4 Beta :

    1. Select Bookmarks > Organize Bookmarks. A bookmark manager dialog opens.
    2. In the left column, choose a location for the new bookmark you’re creating. Next, choose Organize > New Bookmark (on MacOS click the gear icon). The new bookmark dialog opens.
    3. In the Name box, type WebM.
    4. In the Location box, type http://youtube.com/results?search_query=%s&webm=1.
    5. In the Keyword box, type webm.
    6. Click Add.

    Google Chrome Early Release Channel :

    1. On Windows and Linux, click the Chrome wrench icon in the toolbar and select Options. On MacOS, select Chrome > Preferences.
    2. On the Basics tab, click the Manage button in the Default Search section.
    3. On Windows and Linux, click Add. On MacOS X, click the plus (+) button.
    4. In the Name box, type WebM.
    5. In the Keyword box, type webm.
    6. In the URL box, type http://youtube.com/results?search_query=%s&webm=1.
    7. Click OK.

    Opera 10.60 and later :

    1. Go to http://youtube.com.
    2. Right-click in the YouTube search box at the top of the page and select Create Search. On MacOS, use Ctrl+click if you don’t a secondary mouse button enabled.
    3. In the Name box, type WebM.
    4. In the Keyword box, type webm.
    5. In the Address box, type http://youtube.com/results?search_query=%s&webm=1.
    6. Click OK.



    Now you’re ready to search. In the location box of the browser, type webm monster trucks. The YouTube search results page will open with a selection of monster truck videos encoded in the WebM format. When watching a video, look for the HTML5 WebM indicator in the player control bar.

    If you can’t find WebM videos it is most likely a browser cookie problem. Your enrollment in the YouTube HTML5 beta test is stored in a browser cookie (not in your YouTube or Google account), and that cookie can expire. Visit http://youtube.com/html5 and opt-in again to re-set the cookie.

    Directly Accessing WebM Videos by URL

    To find out if any YouTube video is available in WebM, simply add &html5=True (make sure True is capitalized) to the end of the video URL. If there is a WebM version of the video, it will open instead of the Flash version. For example :

  • Writing multi-stream MP4 file with Gstreamer

    26 juin 2023, par Florian Echtler

    My Gstreamer 1.20 application is writing two H.264 video streams and one Opus audio stream to a MP4 file. The relevant parts of the pipeline looks as follows :

    


    Video encoder (this part is present twice) :

    


    queue max-size-time=100000000 leaky=downstream ! x264enc bitrate=1500 speed-preset=ultrafast tune=zerolatency key-int-max=15 ! video/x-h264,profile=constrained-baseline,stream-format=avc ! queue ! mux.


    


    Audio encoder :

    


    queue max-size-time=100000000 leaky=downstream ! opusenc bitrate-type=vbr inband-fec=true ! queue ! opusparse ! mux.


    


    Muxer and filesink :

    


    mp4mux name=mux fragment-duration=1000 latency=100000000 ! filesink sync=true location=out.mp4


    


    The result is an MP4 file which I can play just fine in Totem on Ubuntu, and even switch between video streams using "Switch angles".

    


    However, none of the following work :

    


      

    • play it in VLC (plays a few seconds, then freezes)

      • 


    • do anything with FFMPEG, e.g. split the streams (results are garbage)

      • 


    • seek in the video (even in Totem)

      • 


    


    In all cases, I get some messages about "Invalid NAL unit size" and/or "non-monotonous DTS". So what would I need to do to my output pipeline to get a "compliant" MP4 file ?

    


    


    Note : I can "fix" the resulting file by using GStreamer with qtdemux to split it into two raw H.264 files and a WAV file, and then use ffmpeg to re-encode it into MP4 with an MP3 audio track. But I'd rather have a workable MP4 file right away.

    


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