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Autres articles (10)

  • Encoding and processing into web-friendly formats

    13 avril 2011, par

    MediaSPIP automatically converts uploaded files to internet-compatible formats.
    Video files are encoded in MP4, Ogv and WebM (supported by HTML5) and MP4 (supported by Flash).
    Audio files are encoded in MP3 and Ogg (supported by HTML5) and MP3 (supported by Flash).
    Where possible, text is analyzed in order to retrieve the data needed for search engine detection, and then exported as a series of image files.
    All uploaded files are stored online in their original format, so you can (...)

  • Selection of projects using MediaSPIP

    2 mai 2011, par

    The examples below are representative elements of MediaSPIP specific uses for specific projects.
    MediaSPIP farm @ Infini
    The non profit organizationInfini develops hospitality activities, internet access point, training, realizing innovative projects in the field of information and communication technologies and Communication, and hosting of websites. It plays a unique and prominent role in the Brest (France) area, at the national level, among the half-dozen such association. Its members (...)

  • Sélection de projets utilisant MediaSPIP

    29 avril 2011, par

    Les exemples cités ci-dessous sont des éléments représentatifs d’usages spécifiques de MediaSPIP pour certains projets.
    Vous pensez avoir un site "remarquable" réalisé avec MediaSPIP ? Faites le nous savoir ici.
    Ferme MediaSPIP @ Infini
    L’Association Infini développe des activités d’accueil, de point d’accès internet, de formation, de conduite de projets innovants dans le domaine des Technologies de l’Information et de la Communication, et l’hébergement de sites. Elle joue en la matière un rôle unique (...)

Sur d’autres sites (2807)

  • How to put a png onto an mp4/gif using imagemagick ?

    24 juillet 2022, par Harrison

    TLDR : How do I convert an MP4 to GIF without sacrificing quality ? How can I lay a PNG on a GIF without sacrificing quality ? And how to get rid of the flicker from combining them ?

    


    So I have an MP4 that is 3000x3000 and a PNG that is 1000x1000.

    


    The end result that I want is a GIF that is 1000x1000 where the PNG is layered on top of the MP4 as a background.

    


    These are the step I tried and the issues I am running into. Mainly the issues I am running into are a loss in quality.

    


    MP4 to GIF :

    


      


    1. I have converted the MP4 to a gif with ffmpeg -i background.mp4 background.gif. Result : A major loss of quality in the gif.

      


      2. 


    2. Instead of that - I tried an online converter. Works better but would like to do it on my own. But I will use this GIF from the online converter in the next examples. Still a slight loss of quality but not near as bad.

      


      3. 


    3. I have sized down my gif using convert temporary.gif -coalesce -resize 1000x1000 smaller.gif. (Have also tried with specifying the -size 3000x3000 but no difference really.) Another minor loss of quality there.

      


      4. 


    


    PNG ontop of GIF - Trial 1

    


      

    1. I have converted my PNG to a single page GIF with convert front.png front.gif (Along with some other options). Loses quality, anything that fades or is semi see through gets turned into a solid pixel.

      2. 


    2. Duplicated this page a bunch of times to match number of pages in my background gif using convert front.gif front.gif front.gif multiple times.

      3. 


    3. Merged background and front together with convert background.gif -coalesce null: front.gif -layers composite both.gif. Little more lose of quality and some flickering on the foreground..? Tried some other variations but thats the best I got.

      4. 


    


    PNG on GIF - Trial 2

    


      

    1. Instead of making a GIF of the PNG, I am just using the original PNG with the background.gif like this convert smaller.gif -coalesce null: front.png -layers composite -layers optimize both.gif. This one comes out weird. The from image is very different looking in color and flickery. Not gonna work.

      2. 


    2. Tried without optimization. convert smaller.gif -coalesce null: front.png -layers composite test.gif. This on is closer. The foreground looks great, but is just flickery still ! Again the background is not great but it doesn't seem to have much more impact from after the original mp4 conversion. Did this without -coalesce and still get the same output.

      3. 


    


    The best I can get is a decent front image with details preserved - but flickery. On top of a lossy background.

    


    How can I go about doing this with imagemagick or some other library ?

    


  • Can I know the exact timestamps of a ffmpeg trim ?

    17 juin 2021, par Vincent Garcia

    I want to trim very long video (e.g. >20h long) and I use ffmpeg this way :

    


    ffmpeg -ss 7200 -i /path/to/my/video.mp4 -t 600 -codec copy out.mp4


    


    This is supposed to provide a trim of 10 minutes starting 2 hours in the input video.
As I read online, by placing -ss before the -i option, I'll get an approximate trim.

    


    Is there a way to know precisely when the trim actually started ?

    


    Thank you.

    


  • How to encode with LCEVC using FFmpeg ? [closed]

    22 juillet 2020, par progdotpress

    I have searched quite a bit, but I can't seem to find the command line parameters for encoding with LCEVC (Low Complexity Enhancement Video Coding) using FFmpeg.

    


    There is only one article online on this (https://www.streamingmedia.com/Articles/ReadArticle.aspx?ArticleID=139705) and nothing else.

    


    Does anyone know how this is done ? Thank you !

    


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