Recherche avancée

Médias (91)

Autres articles (39)

  • Les vidéos

    21 avril 2011, par

    Comme les documents de type "audio", Mediaspip affiche dans la mesure du possible les vidéos grâce à la balise html5 .
    Un des inconvénients de cette balise est qu’elle n’est pas reconnue correctement par certains navigateurs (Internet Explorer pour ne pas le nommer) et que chaque navigateur ne gère en natif que certains formats de vidéos.
    Son avantage principal quant à lui est de bénéficier de la prise en charge native de vidéos dans les navigateur et donc de se passer de l’utilisation de Flash et (...)

  • Contribute to a better visual interface

    13 avril 2011

    MediaSPIP is based on a system of themes and templates. Templates define the placement of information on the page, and can be adapted to a wide range of uses. Themes define the overall graphic appearance of the site.
    Anyone can submit a new graphic theme or template and make it available to the MediaSPIP community.

  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

Sur d’autres sites (5166)

  • How to merge 4 transparent videos so they stack together

    26 septembre 2022, par Xiang Chen

    I have 4 transparent videos with the same size, and the duration is just four seconds. They are all in webm format. I want to combine these 4 webm videos.

    


    I used terminal command :

    


    ffmpeg -c:v libvpx-vp9 -i 1.webm -c:v libvpx-vp9 -i 2.webm -filter_complex overlay aa.webm
ffmpeg -c:v libvpx-vp9 -i 3.webm -c:v libvpx-vp9 -i 4.webm -filter_complex overlay bb.webm
ffmpeg -c:v libvpx-vp9 -i aa.webm -c:v libvpx-vp9 -i bb.webm -filter_complex overlay output.webm


    


    Is there a solution here that can be solved in one sentence ? A simpler solution that would stack these four videos for 4 seconds and maintain transparency ?

    


  • FFMPEG : Videos converted from FLV to MP4 does not play in iPod but works in iPhone

    3 juin 2012, par Shakti Singh

    I used below command to convert videos from FLV,M4V to MP4.

    ffmpeg -y -i video_1336406262.flv -vcodec libx264 -vpre slow -vpre
    ipod640 -b 250k -bt 50k -acodec libfaac -ac 2 -ar 48000 -ab 64k -s
    480x320 video_1336406262.mp4

    The videos converted from M4V to MP4 are playing very well in both iPhone and iPod but the videos converted from FLV to MP4 does not work in iPod but does in iPhone.

    In the video area of HTML5 page iPod even does not show the play symbol.

    Could someone help here ?

    I am using the same command to convert from both FLV and M4V to MP4.

    Thanks

  • Rotate mp4 videos without re-encoding

    6 juillet 2024, par stedes

    I'm looking for a way to rotate videos shot with my Nexus 4 on my Debian Wheezy sytem. The videos are shot in portrait mode and I would like to rotate them to landscape mode. Preferably the rotation is command-line driven.

    



    I have found several previous questions which are hinting at a good solution but I can't seem to manage to get it working.

    



    To begin with there was this question :
Rotating videos with FFmpeg

    



    But it indicates that ffmpeg is outdated and that I should use avconv. I found this question detailing the way to go forward.
https://askubuntu.com/questions/269429/how-can-i-rotate-video-by-180-degrees-with-avconv

    



    This made me using following command :

    



    avconv -i original.mp4 -vf "transpose=1" -codec:v libx264 -preset slow -crf 25 -codec:a copy flipped.mp4


    



    However, this is painstakingly slow (last test took me more than 6 hours for less than 3 minutes of footage) and does not result in a playable movie. I also get an error in logging output which states Mb Rate > level limit.

    



    Is there an issue here with the re-encoding ? Should I first re-encode the videos from my phone to another, more "workable" encoding before applying the rotations ? Or am I missing another important point ?

    


Navigation