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Autres articles (52)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • Les autorisations surchargées par les plugins

    27 avril 2010, par

    Mediaspip core
    autoriser_auteur_modifier() afin que les visiteurs soient capables de modifier leurs informations sur la page d’auteurs

  • Submit bugs and patches

    13 avril 2011

    Unfortunately a software is never perfect.
    If you think you have found a bug, report it using our ticket system. Please to help us to fix it by providing the following information : the browser you are using, including the exact version as precise an explanation as possible of the problem if possible, the steps taken resulting in the problem a link to the site / page in question
    If you think you have solved the bug, fill in a ticket and attach to it a corrective patch.
    You may also (...)

Sur d’autres sites (6875)

  • Streaming a video to /dev/video0 using gstreamer and v4l2 shows a black screen [on hold]

    24 septembre 2019, par Lawliet

    I’ve been trying to use a video as a webcam for quite a while now. The command

    gst-launch-1.0 filesrc location=newflag.webm ! decodebin ! videoconvert ! v4l2sink device=/dev/video0

    Using this command, i’m able to watch the stream using VLC but Discord and Firefox display a black screen when using /dev/video0 as a webcam.

    I got it working using ffmpeg to stream the video in yuv420p so I suspect videoconvert converts the stream to YUY2 which is I guess not supported by Discord nor Firefox.

    Any idea on how to get this to work ?

  • ffmpeg overlay filter adds black background for PNG with transparency

    30 janvier 2019, par Pavel S.

    I’m trying to programmatically add PNG overlay over h264 video.

    Even though PNG image has alpha channel, after I apply filter, on a resulting video this image has black background instead of transparent one.
    Here’s the filter :

    "[in][in2]overlay=15:15[out]"

    I’m using openh264 to decode/encode video, so the pixel format of resulting video is YUV420P.
    I’ve tried to explicitly define format in filter :

    [in][in2]overlay=15:15,format=rgba,format=yuv420p[out];

    But no change.
    ffmpeg : 3.4 ;
    openh264 : Git (i.e. 1.9.0)

    Thanks in advance.

  • imgutils : add function to clear an image to black

    22 juillet 2017, par wm4
    imgutils : add function to clear an image to black

    Black isn’t always just memset(ptr, 0, size). Limited YUV in particular
    
requires relatively non-obvious values, and filling a frame with
    
repeating 0 bytes is disallowed in some contexts. With component sizes
    
larger than 8 or packed YUV, this can become relatively complicated. So
    
having a generic function for this seems helpful.
    

    In order to handle the complex cases in a generic way without destroying
    
performance, this code attempts to compute a black pixel, and then uses
    
that value to clear the image data quickly by using a function like
    
memset.
    

    Common cases like yuv410p10 or rgba can’t be handled with a simple
    
memset, so there is some code to fill memory with 2/4/8 byte patterns.
    
For the remaining cases, a generic slow fallback is used.
    

    Signed-off-by : Anton Khirnov <anton@khirnov.net>
    • [DBH] doc/APIchanges
    • [DBH] libavutil/imgutils.c
    • [DBH] libavutil/imgutils.h
    • [DBH] libavutil/version.h

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