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Autres articles (67)

  • Les sons

    15 mai 2013, par

  • 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 (...)

Sur d’autres sites (3843)

  • Transparent movie with video format qtrle unplayable in QuickTime

    1er janvier 2021, par 220284

    I use the python library Manim to generate mathematical animations. I want to use the animations in Keynote presentations. Manim has the option to produce movie clips with a transparent background. Unfortunately, QuickTime won't play the files generated by Manim. Here's the metadata for a file produced by Manim

    


    Metadata:
    major_brand     : qt  
    minor_version   : 512
    compatible_brands: qt  
    encoder         : Lavf58.45.100
  Duration: 00:01:07.00, start: 0.000000, bitrate: 6635 kb/s
    Stream #0:0: Video: qtrle (rle  / 0x20656C72), argb(progressive), 1280x960, 6632 kb/s, 60 fps, 60 tbr, 15360 tbn, 15360 tbc (default)
    Metadata:
      handler_name    : VideoHandler
      encoder         : Lavc58.91.100 qtrle


    


    Ideally, I would want to use ffmpeg to turn these files into movie clips with transparent background which are playable in QuickTime. Can this be done ?

    


    As a work around, I imported the files into Final Cut Pro and exported them again using Apple Pro Res 4444, but this resulted in huge file sizes.

    


  • Video Converted with ffmpeg is blank in a browser but fine when played on my desktop

    4 mars 2023, par Bruce Hooke

    I am using ffmpeg to downsize videos on a website but after downsizing the videos have sound but no video. If I download them to my desktop and play them in VLC Media Player they are fine and have both sound and video.

    


    The command I'm using to make the conversion is :

    


    ffmpeg -i [path to source video] -vf "scale=-1:1280" -c:v libx265 -vtag hvc1 -b:v 800K -pix_fmt yuv420p -c:a copy [path to destination video]


    


    I've removed the path information for privacy but that part is clearly working because the smaller video is produced. I'm sure it must be something in the ffmpeg command as the "raw" videos play fine in a browser but I can't figure out what I'm doing wrong.

    


    I also tried :

    


      

    • Removing the bitrate setting, which made no difference on the issue.

      • 


    • shifting to libx264, which did not work at all.

      • 


    • I tried removing -pix_fmt yuv420p but that made no difference.

      • 


    • I tried removing the vtag and that made no difference.

      • 


    


  • diracdec : fix full range videos

    22 janvier 2016, par Rostislav Pehlivanov
    diracdec : fix full range videos

    Full range video had been broken by the introduction of the < 2U check
    
at the following line. The bitstream format kind of implies that the full
    
and limited ranges use different pix_fmts but that’s incorrect since we
    
have the avctx->color_range flag. So adjust the pixel range index to
    
be mapped to the same pix_fmts as limited range index.
    

    Signed-off-by : Rostislav Pehlivanov <atomnuker@gmail.com>
    • [DH] libavcodec/dirac.c

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