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Autres articles (73)

  • Support de tous types de médias

    10 avril 2011

    Contrairement à beaucoup de logiciels et autres plate-formes modernes de partage de documents, MediaSPIP a l’ambition de gérer un maximum de formats de documents différents qu’ils soient de type : images (png, gif, jpg, bmp et autres...) ; audio (MP3, Ogg, Wav et autres...) ; vidéo (Avi, MP4, Ogv, mpg, mov, wmv et autres...) ; contenu textuel, code ou autres (open office, microsoft office (tableur, présentation), web (html, css), LaTeX, Google Earth) (...)

  • 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 (...)

  • 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

Sur d’autres sites (5806)

  • avfilter/vf_paletteuse : do not sort transparency color

    19 août 2021, par Paul B Mahol
    avfilter/vf_paletteuse : do not sort transparency color

    Make last palette entry always transparent color.
    
Fixes wrong filtered output with new=1 option set.
    • [DH] libavfilter/vf_paletteuse.c

  • Correcting color cast with ffmpeg

    16 mai 2018, par Henry H

    I have two videos that have a pretty significant blue cast to them. I took some stills at the same time and I’m happy enough with the colors on those and I’d like to re-encode the videos, adjusting the colors to something similar to the stills.

    I understand I could either create a large collection of jpg images from the video and color correct them before reassembling them into a new video or I could use ffmpeg’s color level’s filter to do it directly. What I don’t know is how to get the numbers to pass to the filter. I’m assuming I want to do something like this :

    ffmpeg -i video.mov -vf "colorlevels=rimin=##/255:gimin=##/255:bimin=#/255:rimax=###/255:gimax=###/255:bimax=###/255, eq=gamma=#.##" -y out.mov

    How do I get the values to use for each of the r, g, and b min and max settings and gamma to use in place of the ###s ? Assuming this is the right approach, of course.

    Update : Perhaps this question would be better asked in a forum for gimp or photoshop. But I know how to adjust the color in those. What I need to know is how I translate those changes to what ffmpeg is expecting.

  • Resizing an mp4 with ffmpeg reduces color quality

    16 novembre 2019, par Jules

    Initially I’ve downloaded a video from an m3u8 to an mp4. The color of the downloaded video is fine at this point and mirrors the source. This is the command I’m using..

    ffmpeg -i https://...default.m3u8 -acodec copy -vcodec copy download.mp4

    My next step is to resize the source video from 1142 x 652, to create a new larger letter-box / pillar-box video of 1920 x 886

    ffmpeg -i download.mp4 -vf "scale=(iw*sar)*min(1920/(iw*sar)\,886/ih):ih*min(1920/(iw*sar)\,886/ih), 
    
  pad=1920:886:(1920-iw*min(1920/iw\,886/ih))/2:(886-ih*min(1920/iw\,886/ih))/2" resized.mp4

    However the color of the resized video is different, it could be that the amount of colours has been reduced, but that’s just a guess.

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