Recherche avancée

Médias (91)

Autres articles (51)

  • Prérequis à l’installation

    31 janvier 2010, par

    Préambule
    Cet article n’a pas pour but de détailler les installations de ces logiciels mais plutôt de donner des informations sur leur configuration spécifique.
    Avant toute chose SPIPMotion tout comme MediaSPIP est fait pour tourner sur des distributions Linux de type Debian ou dérivées (Ubuntu...). Les documentations de ce site se réfèrent donc à ces distributions. Il est également possible de l’utiliser sur d’autres distributions Linux mais aucune garantie de bon fonctionnement n’est possible.
    Il (...)

  • De l’upload à la vidéo finale [version standalone]

    31 janvier 2010, par

    Le chemin d’un document audio ou vidéo dans SPIPMotion est divisé en trois étapes distinctes.
    Upload et récupération d’informations de la vidéo source
    Dans un premier temps, il est nécessaire de créer un article SPIP et de lui joindre le document vidéo "source".
    Au moment où ce document est joint à l’article, deux actions supplémentaires au comportement normal sont exécutées : La récupération des informations techniques des flux audio et video du fichier ; La génération d’une vignette : extraction d’une (...)

  • 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 (...)

Sur d’autres sites (8584)

  • 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 ?

    


  • gstreamer vaapih264enc generated ts segment dont play on AVPlayer

    21 juin 2022, par Guru Govindan

    I have a pipeline that transcodes an rtsp stream into hls segments. The manifest is playable in browsers(with hlsjs) and ffplay and VLC. However when I play the stream or individual ts segments in Quicktime player or my IOS App that uses avplayer, it doesnt work.

    


    This seems to be an issue only with vaapih264enc. When I try the same with software encode like x264enc it works fine.

    


    The following is a simple pipeline where this is reproducible.

    


    GST_DEBUG=3 gst-launch-1.0 rtspsrc location='rtsp://user:pass@10.10.10.12:554/' name=rtpsrc0 \
 rtpsrc0. ! rtph264depay ! queue ! decodebin ! vaapih264enc ! mpegtsmux name=mux ! filesink location=mymux.ts \
 rtpsrc0. ! decodebin ! queue ! fdkaacenc ! mux.


    


    when I run the following command to copy the encoded stream as is from the generated ts segment it works

    


    ffmpeg -i mymux.ts -c copy mymux_ffmpeg.ts


    


    Is the ffmpeg adding some additional header information that the quicktime player is happy with ?

    


    I appreciate any help with this.

    


Navigation