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Médias (91)

Autres articles (56)

  • Amélioration de la version de base

    13 septembre 2013

    Jolie sélection multiple
    Le plugin Chosen permet d’améliorer l’ergonomie des champs de sélection multiple. Voir les deux images suivantes pour comparer.
    Il suffit pour cela d’activer le plugin Chosen (Configuration générale du site > Gestion des plugins), puis de configurer le plugin (Les squelettes > Chosen) en activant l’utilisation de Chosen dans le site public et en spécifiant les éléments de formulaires à améliorer, par exemple select[multiple] pour les listes à sélection multiple (...)

  • Emballe médias : à quoi cela sert ?

    4 février 2011, par

    Ce plugin vise à gérer des sites de mise en ligne de documents de tous types.
    Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ;

  • Menus personnalisés

    14 novembre 2010, par

    MediaSPIP utilise le plugin Menus pour gérer plusieurs menus configurables pour la navigation.
    Cela permet de laisser aux administrateurs de canaux la possibilité de configurer finement ces menus.
    Menus créés à l’initialisation du site
    Par défaut trois menus sont créés automatiquement à l’initialisation du site : Le menu principal ; Identifiant : barrenav ; Ce menu s’insère en général en haut de la page après le bloc d’entête, son identifiant le rend compatible avec les squelettes basés sur Zpip ; (...)

Sur d’autres sites (3511)

  • avformat/rtpdec_jpeg : fix low contrast image on low quality setting

    24 mars 2016, par Ico Doornekamp
    avformat/rtpdec_jpeg : fix low contrast image on low quality setting

    Original mail and my own followup on ffmpeg-user earlier today :
    

    I have a device sending out a MJPEG/RTP stream on a low quality setting.
    
Decoding and displaying the video with libavformat results in a washed
    
out, low contrast, greyish image. Playing the same stream with VLC results
    
in proper color representation.
    

    Screenshots for comparison :
    

      http://zevv.nl/div/libav/shot-ffplay.jpg
    
  http://zevv.nl/div/libav/shot-vlc.jpg
    

    A pcap capture of a few seconds of video and SDP file for playing the
    
stream are available at
    

      http://zevv.nl/div/libav/mjpeg.pcap
    
  http://zevv.nl/div/libav/mjpeg.sdp
    

    I believe the problem might be in the calculation of the quantization
    
tables in the function create_default_qtables(), the attached patch
    
solves the issue for me.
    

    The problem is that the argument ’q’ is of the type uint8_t. According to the
    
JPEG standard, if 1 <= q <= 50, the scale factor ’S’ should be 5000 / Q.
    
Because the create_default_qtables() reuses the variable ’q’ to store the
    
result of this calculation, for small values of q < 19, q wil subsequently
    
overflow and give wrong results in the calculated quantization tables. The
    
patch below uses a new variable ’S’ (same name as in RFC2435) with the proper
    
range to store the result of the division.
    

    Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
    • [DH] libavformat/rtpdec_jpeg.c

  • Official Debian Package for Piwik now available

    15 avril 2014, par Matthieu Aubry — Community, Meta

    We are excited to announce the release of Piwik package for Debian based linux distributions !

    There are several ways to use Piwik :

    - Download and upload to your server

    - or use 1-click Piwik installers

    - or use Microsoft web app gallery

    - or buy Piwik Cloud

    - or as of today, you may get Piwik using our Debian package

    What are the benefits of using Debian package over direct download ?

    For some system administrators, using Debian package is an easier alternative than directly downloading the code. It allows sysadmins to deploy Piwik within seconds using “apt-get install piwik -V”.

    How do I install Piwik using official debian package ?

    The package supports Apache and Nginx web servers. Read the documentation at debian.piwik.org.

    Do I have to use the Debian Package on my debian system ?

    No, you may still want to use Piwik using the direct download approach. You can keep Piwik upgraded quite easily using the popular 1-click automatic update.

    How do I report a bug or feedback ?

    Create a ticket on the Github project Issues page.

    Will the debian repository be maintained in the future ?

    Yes, Aurélien Requiem (github) along with the Piwik team are committed to maintain the Debian Piwik repository in the future.

    Thank you to Aurélien for his great work on preparing, testing, and maintaining the Debian repository for Piwik.

    References

  • lavu/hwcontext_vulkan : support mapping VUYX, P012, and XV36

    20 août 2022, par Philip Langdale
    lavu/hwcontext_vulkan : support mapping VUYX, P012, and XV36

    If we want to be able to map between VAAPI and Vulkan (to do Vulkan
    
filtering), we need to have matching formats on each side.
    

    The mappings here are not exact. In the same way that P010 is still
    
mapped to full 16 bit formats, P012 has to be mapped that way as well.
    

    Similarly, VUYX has to be mapped to an alpha-equipped format, and XV36
    
has to be mapped to a fully 16bit alpha-equipped format.
    

    While Vulkan seems to fundamentally lack formats with an undefined,
    
but physically present, alpha channel, it has have 10X6 and 12X4
    
formats that you could imagine using for P010, P012 and XV36, but these
    
formats don't support the STORAGE usage flag. Today, hwcontext_vulkan
    
requires all formats to be storable because it wants to be able to use
    
them to create writable images. Until that changes, which might happen,
    
we have to restrict the set of formats we use.
    

    Finally, when mapping a Vulkan image back to vaapi, I observed that
    
the VK_FORMAT_R16G16B16A16_UNORM format we have to use for XV36 going
    
to Vulkan is mapped to Y416 when going to vaapi (which makes sense as
    
it's the exact matching format) so I had to add an entry for it even
    
though we don't use it directly.
    • [DH] libavutil/hwcontext_vulkan.c
    • [DH] libavutil/version.h

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