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Autres articles (17)

  • Keeping control of your media in your hands

    13 avril 2011, par

    The vocabulary used on this site and around MediaSPIP in general, aims to avoid reference to Web 2.0 and the companies that profit from media-sharing.
    While using MediaSPIP, you are invited to avoid using words like "Brand", "Cloud" and "Market".
    MediaSPIP is designed to facilitate the sharing of creative media online, while allowing authors to retain complete control of their work.
    MediaSPIP aims to be accessible to as many people as possible and development is based on expanding the (...)

  • 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.

  • Les statuts des instances de mutualisation

    13 mars 2010, par

    Pour des raisons de compatibilité générale du plugin de gestion de mutualisations avec les fonctions originales de SPIP, les statuts des instances sont les mêmes que pour tout autre objets (articles...), seuls leurs noms dans l’interface change quelque peu.
    Les différents statuts possibles sont : prepa (demandé) qui correspond à une instance demandée par un utilisateur. Si le site a déjà été créé par le passé, il est passé en mode désactivé. publie (validé) qui correspond à une instance validée par un (...)

Sur d’autres sites (3358)

  • Open avi file with OpenCV : ffmpeg ?

    28 juin 2012, par CTZStef

    This question is related to a previous question I asked here.

    I read on the Willow Garage website dedicated to OpenCV that we do not have to take care of ffmpeg while installing OpenCV since version 1.2.x. Here it is.

    However, some questions asked here on Stackoverflow suggest the contrary.

    So, what should I do ? Do I have to recompile OpenCV and do some special operation related to ffmpeg to get it to, finally, open avi file on my Linux system ?

  • Ffmpeg adding watermark with qsv hardware acceleration optimize performance

    11 février 2020, par Ksilon

    I add text watermark on video with ffmpeg but i’m new with ffmpeg and try to optimize performance for this.

    My test setup has i5-7500 and Intel HD 630. I tried this code to add watermark on video. If I do not set -hwaccel_output_format to yuv420p or nv12 , it gives error.

    ffmpeg -threads 4 -hwaccel qsv -hwaccel_output_format yuv420p -i "input.mp4" -vf "drawtext=text='TEST':x=(W-tw)/2:y=(H-th)/2:fontfile=arial.ttf:fontsize=250:fontcolor=white@0.4:shadowcolor=black@0.4:shadowx=2:shadowy=2" -c:v h264_qsv "output.mp4"

    When I run this code, Cpu usage 53% / fps = 90-95 / gpu_load(GPU-Z) = 35-38%
    When I changed -threads 1, Cpu usage 35% / fps = 68-72 / gpu_load(GPU-Z) = 28-30%

    Find -async_depth keyword on the Internet and tried it with 5 but nothing happens or I used it wrong.

    How can use more gpu and less cpu for this operation ?

  • Creating a video from data of server-side script

    8 mars 2016, par Peter Leupold

    My plan is to display the data that a server-side script generates in a video displayable on my web page. So far my approach is the following :

    1. A three dimensional integer array in a C script is use to accumulate the image data. Dimensions are width, breadth and color (R, G and B).
    2. The array is written to a ppm-file.
    3. The next picture is accumulated and written and so on.
    4. With ffmpeg a script merges the ppm-files to a mp4-video.

    Basically this works, but of course faster would be nicer. I would appreciate proposals for fundamentally different approaches as well as help on the following details :

    • Is there a file format simple as ppm that uses the HEX code for colors instead of triplets ? This would reduce the size of my array as well a the number of write operations.
    • Do I loose much time if I print every single value to the file with an fprintf operation instead of accumulating lines into a string ? Or do compilers optimize this kind of sequences of writes ?

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