Recherche avancée

Médias (91)

Autres articles (104)

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • 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.

  • Des sites réalisés avec MediaSPIP

    2 mai 2011, par

    Cette page présente quelques-uns des sites fonctionnant sous MediaSPIP.
    Vous pouvez bien entendu ajouter le votre grâce au formulaire en bas de page.

Sur d’autres sites (7424)

  • ffmpeg scale down video dynamically (squeeze-back) or zoompan out to smaller than original VER2

    19 juillet 2023, par loarrin

    I have 2 videos, I'm trying to overlay one on top of the other, and have it shrink down in an animated fashion until it appears like a picture-in-picture setup. Then, after a few seconds it should scale back up. Just like in this question. Here is the working code from there :

    


    ffmpeg -i bg.mov -i top.mov -filter_complex "[0:v]scale=1920x1080,setpts=PTS-STARTPTS[bg]; [1:v]setpts=PTS-STARTPTS+2/TB, scale=-1:'480+600*abs(sin((t-2)*2*PI/8))':eval=frame[top]; [bg][top]overlay" -vcodec libx264 out.mp4


    


    It works perfectly, but I have one difference I cannot achieve modifying existing code : scale filter in this example resizes the second video stream having attraction point in the top left corner of this stream. I mean, when the second stream is getting smaller, it is scaled to the top left corner. And if it is getting bigger, it again stretches from the top left corner. The top left corner of the stream being scaled is staying in one place constantly no matter what.

    


    Is it possible to make more symmetrical version of this scale code, so when the second stream is scaled it is scaled from and to the top center of it (So the top left corner would move right when the stream is getting smaller and move to the left then the stream is getting bigger) ?

    


    enter image description here

    


  • Streaming protocol relay without involving codec

    4 décembre 2015, par kiran_g

    I am trying to use libav to relay an RTSP stream. It involves PULLing the stream from an IP camera and then PUSHing to wowza.

    The video encoding in the IP camera stream is h264. To enable h264 in my libav application I need to enable x264. But as x264 is GPL, it will not work with my business plan.

    My questions is whether libav (ffmpeg) can be made to work like a dumb relay which is encoding-agnostic ? so that I dont need to integrate x264 with ffmpeg.

    This SO post says that I can use the "copy" argument, but does that allow me to exclude x264 ?

    BTW, is x264 actually needed by ffmpeg for decoding h264 ? Is x264 only used in encoding ?

    See here for my current code.

  • Streaming protocol relay without involving codec

    4 décembre 2015, par kiran_g

    I am trying to use libav to relay an RTSP stream. It involves PULLing the stream from an IP camera and then PUSHing to wowza.

    The video encoding in the IP camera stream is h264. To enable h264 in my libav application I need to enable x264. But as x264 is GPL, it will not work with my business plan.

    My questions is whether libav (ffmpeg) can be made to work like a dumb relay which is encoding-agnostic ? so that I dont need to integrate x264 with ffmpeg.

    This SO post says that I can use the "copy" argument, but does that allow me to exclude x264 ?

    BTW, is x264 actually needed by ffmpeg for decoding h264 ? Is x264 only used in encoding ?

    See here for my current code.

Navigation