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Autres articles (87)

  • 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

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • 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

Sur d’autres sites (11095)

  • Why pixels color are different before and after encoding ? , How to set the same ?

    11 mars 2015, par mitli

    I want to change some pixels of some frames, I do this steps :

    1 - Extract frames from FLV video to PNG

    2 - Change frame pixels color ,For example I set color of Pixel(0,0) to ARGB (0,0,0,0)

    3 - Encode frames to a video by below code :

    -i Frame%04d.png -filter_complex "[0:0] scale= [wm]; [wm][1:0] overlay=1:1 [out]" -map "[out]" -map 0:a  -c:v libx264 -vprofile low outfile.flv

    But when I check "outfile.flv" frames , pixel 0,0 is 255,7,2,3 instead of 0,0,0,0 , why ? Please tell me that how can I get same pixels color after encode ?

  • FFMPEG waveform transparent, background solid color

    11 mai 2016, par user1152226

    I am trying to generate a waveform with ffmpeg, I want the background to be a solid color, and the actual waveform to be transparent. The following achieves partially what i want, except that in has a black background. I would like to be able to change this to any color, but have the waveform be transparent. How can i achieve this with ffmepg ?

    ffmpeg -i input.mp3 -filter_complex \
    
"[0:a]aformat=channel_layouts=mono,\
    
compand=gain=-6, \
    
showwavespic=s=600x120, \
    
colorchannelmixer=rr=1:gg=0:bb=0:aa=1,\
    
drawbox=x=(iw-w)/2:y=(ih-h)/2:w=iw:h=1:color=red,\
    
format=rgba,\
    
colorkey=#ff0000" \
    
-vframes 1 output.png

    This generates this waveform : the background is black, the waveform itself is transparent. How do I change the background color to a different color, while still keeping the waveform transparent ?

    enter image description here

  • How to use if statement to add color overlay in FFMPEG

    7 septembre 2020, par cHiWa
    ffmpeg -i input.mp4 -y -t 10 -vf drawbox=x=0:y=0:w=200:h=200:color='if(1==1\,red\,green)':t=fill output.mp4


    


    I tried to test how can I use if statement to add colored square overlay to a video, but got following error.

    


    Cannot find color 'if(1==1,red,green)'
[AVFilterGraph @ 000002d24a659440] Error initializing filter 'drawbox' with args 'x=0:y=0:w=200:h=200:color=if(1==1,red,green):t=fill'
Error reinitializing filters !
Failed to inject frame into filter network : Invalid argument
Error while processing the decoded data for stream #0:0

    


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