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Autres articles (57)

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

  • 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 (...)

Sur d’autres sites (9777)

  • Capture user-defined segment of RTSP video using FFmpeg

    10 janvier 2019, par Tom Larcher

    I’m endeavouring to capture a segment of video from an RTSP (static not live) video stream using FFmpeg, however I’m not certain how this is achieved.

    I am presently able to cut a segment of video from a local video file using a command similar to the one below :

    ffmpeg -y -i input_video.mp4 -ss 0:04:41.215 -to 0:07:17.335 output_video.mp4

    However commands similar to the above don’t seem to be working for remote (RTSP) video files. I’ve taken a look around for ways in which this can be achieved, to no avail. I’ve come across information on capturing individual frames as well as methods of capturing RTSP video files for storage locally, but I can’t seem to connect the dots to capture only a selected portion of the RTSP video.

    Any help on this would be immensely appreciated.

  • Revision eec3def7c5 : Modified no memory rate control. This 2-pass rate control setting allocates bit

    16 octobre 2013, par Paul Wilkins

    Changed Paths :
     Modify /vp9/encoder/vp9_onyx_if.c


     Modify /vp9/encoder/vp9_onyx_int.h


     Modify /vp9/encoder/vp9_ratectrl.c



    Modified no memory rate control.

    This 2-pass rate control setting allocates bits based
    on first pass stats to each kf group, gf group and individual
    frame but does not correct the bits left and allocation after
    each frame.

    In other words it recommends a bit allocation for each frame
    but does not try and correct any over or under spend on a
    frame over the remainder of the clip. This reduces the accuracy
    of rate control in terms of hitting an average bitrate but prevents
    problems that may arise because early frames either use to many
    or too few bits. This mode is currently more inclined to undershoot
    than overshoot (particularly at higher data rates).

    Also minor changes to rate of adaption when recode loop is not
    enabled.

    This mode is currently enabled by default for VBR.
    It gives the following % performance gains.

    derf +0.467, +1.072
    yt 2.962, 2.645
    stdhd 1.682, 1.595,
    yt-hd 2.3, 2.174

    Change-Id : I3c84a9bf8884e5b345698ff0e19187f792c2f3a0

  • Ffmpeg gdigrab records black window when capturing graphics-intensive flight simulator

    23 mars 2021, par iter

    I am trying to capture video from XPlane, a popular flight simulator. I'm running on Windows.

    



    Normally, I can capture individual windows using gdigrab, but when I use it on an XPlane window like so...

    



    ffmpeg -f gdigrab -framerate 30 -i "X-System" -b:v 300K capture.mp4


    



    ...I get a video file that's the right dimensions but is all black. I imagine this may have something to do with how XPlane talks directly to the GPU. I should add that if I capture the entire desktop like so...

    



    ffmpeg -f gdigrab -framerate 30 -i desktop -b:v 300K capture.mp4


    



    ...I get everything including the simulator window, but naturally with unrelated windows in the capture, including windows sitting on top of the simulator window.

    



    Is there a way for gdigrab to capture video this GPU-intensive window alone ? Is there a different tool I can use ?

    


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