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Autres articles (45)

  • Publier sur MédiaSpip

    13 juin 2013

    Puis-je poster des contenus à partir d’une tablette Ipad ?
    Oui, si votre Médiaspip installé est à la version 0.2 ou supérieure. Contacter au besoin l’administrateur de votre MédiaSpip pour le savoir

  • 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 (...)

  • Automated installation script of MediaSPIP

    25 avril 2011, par

    To overcome the difficulties mainly due to the installation of server side software dependencies, an "all-in-one" installation script written in bash was created to facilitate this step on a server with a compatible Linux distribution.
    You must have access to your server via SSH and a root account to use it, which will install the dependencies. Contact your provider if you do not have that.
    The documentation of the use of this installation script is available here.
    The code of this (...)

Sur d’autres sites (8501)

  • Merging RGB Channels in FFMPEG [migrated]

    14 octobre 2016, par Draconis

    I have three grayscale videos, representing the red, green, and blue channels from a video. I extracted them using the extractplanes filter, and sent them through different pipelines.

    Now I would like to combine them again. But while extractplanes is working perfectly, mergeplanes is not. My initial attempt was this :

    [r][g][b] mergeplanes=0x001020 [output]

    This interprets my RGB channels as YUV, which is not what I want. My next attempt was this :

    [r][g][b] mergeplanes=0x001020:rgb24 [output]

    But according to the error message, Only planar formats with more than one component are supported. (Same for all other RGB and RGBA pixel formats I tried.)

    Is there another way to put these channels back together ? Or some way to convince mergeplanes to output RGB ?

  • Streaming images with ffmpeg gives shorter video

    24 juin 2014, par darko_5

    I am streaming a video form my camera by passing to ffmpeg images from that camera. I am using command :

    ffmpeg -r 26 -re -f image2pipe -vcodec mjpeg -i - -c:v libx264 -f flv -preset ultrafast -s hd720 -maxrate 2000k -bufsize 150k rtmp://someaddress:port

    My problem is that, when light is weak and/or computer is slow my fps number is getting lower, even so i set it to -r 26. Low fps causing that video playad on web side is sometimes in fast motion and file i save to disk is shorter than it should.
    My opereting system is OS X. How can i do it so the video i s in proper speed.

  • create video with fluctuated background color and drawbox with fluctuated color ?

    27 mai 2019, par Wang

    Is there anyway to create a video with fluctuated background color choosing from a list for example [R, G, B] the background color along time will be R,G,B,R,G,B .... I might use nullsrc with geq. But seems the geq is quite slow which apply to each pixel.

    I would also like to change the color of drawbox too, is there any easy way to do it ? I knew we might be able to use openclsrc but it seems overkill for this simple task.

    Update, for drawbox I found a way, which is kind of abuse the timeline editing :

    ffmpeg -f lavfi -i smptebars=r=30:d=30:size=800x600 -vf "drawbox=enable='eq(mod(n,3),0)':x=0:y=0:t=20:c=red,drawbox=enable='eq(mod(n,3),1)':x=0:y=0:t=20:c=green,drawbox=enable='eq(mod(n,3),2)':x=0:y=0:t=20:c=blue" /tmp/test_box.mp4

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