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Autres articles (80)
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Emballe médias : à quoi cela sert ?
4 février 2011, parCe plugin vise à gérer des sites de mise en ligne de documents de tous types.
Il crée des "médias", à savoir : un "média" est un article au sens SPIP créé automatiquement lors du téléversement d’un document qu’il soit audio, vidéo, image ou textuel ; un seul document ne peut être lié à un article dit "média" ; -
XMP PHP
13 mai 2011, parDixit Wikipedia, XMP signifie :
Extensible Metadata Platform ou XMP est un format de métadonnées basé sur XML utilisé dans les applications PDF, de photographie et de graphisme. Il a été lancé par Adobe Systems en avril 2001 en étant intégré à la version 5.0 d’Adobe Acrobat.
Étant basé sur XML, il gère un ensemble de tags dynamiques pour l’utilisation dans le cadre du Web sémantique.
XMP permet d’enregistrer sous forme d’un document XML des informations relatives à un fichier : titre, auteur, historique (...) -
Use, discuss, criticize
13 avril 2011, parTalk 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.
Sur d’autres sites (4091)
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Use ffmpeg to compile RGBA image sequence into two separate videos (RGB + Alpha)
27 novembre 2018, par MirceaKitsuneI plan on using Blender to render animated sequences for a game. I need the videos to have transparent backgrounds in the format expected by its engine. This format involves the transparency being defined as a separate grayscale video of equal FPS and duration. Since splitting the RGB and Alpha channels in Blender is more complicated, I’d prefer doing this directly from ffmpeg.
The input directory contains an image sequence of png files in RGBA format (eg : 0000.png to 0100.png). What I need ffmpeg to do is compile them into two separate videos : One containing only the RGB channels (leave transparency black) and another containing only the grayscale alpha channel. In the end I’d have something like my_video.mp4 + my_video_mask.mp4.
I’m familiar with compiling non-transparent image sequences into video using :
ffmpeg -f image2 -i /path/to/sequence/%04d.png output.mp4
But I don’t know how to extract the alpha channel and make it a separate video file. What is the simplest ffmpeg command to achieve this result ?
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Watermark video with FFMPEG
15 octobre 2018, par gbviscontiI’d like to put a watermark on my videos and I started trying to do it with ffmpeg.
After some study, I created this command line :
ffmpeg -i input.mp4 -loop 1 -i logo.png -filter_complex "[1]trim=0:30,fade=in:st=0:d=1:alpha=1,fade=out:st=9:d=1:alpha=1,loop=999:750:0,setpts=N/25/TB[w];[0][w]overlay=shortest=1:x=if(eq(mod(n\,200)\,0)\,sin(random(1))*w\,x):y=if(eq(mod(n\,200)\,0)\,sin(random(1))*h\,y)" output.mp4
Works fine, but I’d like to make a few changes, but I don’t know how.
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Is it possible change this command to use text instead of image ? Or make image more transparent with some parameter in command ?
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How could I make the position (x,y) more random ? It is mostly appearing in top left area of video.
Thanks for any help !
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overlaying .png without loosing transparency of .mov using FFMPEG
3 octobre 2018, par drexdeltaI am trying to overlay .png(transparent image) over .mov (transparent video) using this blog. I am using basic command like,
ffmpeg -i inputVideo.mov -i overlay.png -filter_complex "overlay=100:254" output.mov
while looking for solution, I found similar issue here , but it uses C#. I am looking for simple ffmpeg command. Thank you.
EDIT : 1
I found this . and there is no solution :( .