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Autres articles (50)

  • 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

  • Contribute to documentation

    13 avril 2011

    Documentation is vital to the development of improved technical capabilities.
    MediaSPIP welcomes documentation by users as well as developers - including : critique of existing features and functions articles contributed by developers, administrators, content producers and editors screenshots to illustrate the above translations of existing documentation into other languages
    To contribute, register to the project users’ mailing (...)

  • Ajouter notes et légendes aux images

    7 février 2011, par

    Pour pouvoir ajouter notes et légendes aux images, la première étape est d’installer le plugin "Légendes".
    Une fois le plugin activé, vous pouvez le configurer dans l’espace de configuration afin de modifier les droits de création / modification et de suppression des notes. Par défaut seuls les administrateurs du site peuvent ajouter des notes aux images.
    Modification lors de l’ajout d’un média
    Lors de l’ajout d’un média de type "image" un nouveau bouton apparait au dessus de la prévisualisation (...)

Sur d’autres sites (7285)

  • FFMPEG lossless simple & efficient format

    30 octobre 2016, par Adminy

    I took a sample video and ran this code for each image format like this :

    ffmpeg -i test.mkv png/%d.png
    
ffmpeg -i test.mkv bmp/%d.bmp

    What I noted is that BMP at 1080P has a fixed size of 5.97 MB (6,266,934 bytes)

                                                               !6,220,800

    Then I did some maths :

    1 byte = 2^8 == 256 possible combinations
    
r + g + b form a color (0-255,0-255,0-255)
    
bmp = 3 * 1920 * 1080 = 6,220,800 bytes

    So extra is just the file headers ?! (46134 bytes for just headers ?)

    Next thing I noted that PNG size is dynamic and when the image has a lot of repetition is somewhere 2.5mb. Usually its between 10mb and 12mb.

    Also decoding BMP seemed a lot quicker compared to PNG. So there is no point in even looking at PNG. I would like to know why is it so huge over BMP if it has (zlib) compression factor.

    What is the best format to export to in terms of speed and size, preferred if its as simple as reading the file of color bytes ?

  • NGINX and FFMPEG generate dynamic adaptive streaming

    4 janvier 2021, par WebMaster

    In this configuration file
https://github.com/TareqAlqutami/rtmp-hls-server/blob/master/conf/nginx.conf#L24-L30

    


    


    for each received stream, transcode for adaptive streaming This single
ffmpeg command takes the input and transforms the source into 4
different streams with different bitrates and qualities. # these
settings respect the aspect ratio.

    


    


    How we can dynamically generate variants ? i.e for 1080p input generate all variants, but for 240p input generate no variants

    


  • How to increase resolution in ffmpeg with rawvideo [closed]

    2 novembre 2020, par Jamie Hutber

    I am using my DSLR with loopback to use as a webcam, however the resolution is locked at 640x426 and I cannot seem to find a way to make this larger as the stream itself is 1080p from the camera.

    


    sudo modprobe v4l2loopback video_nr=2 exclusive_caps=1,1,1 card_label='Screenshare' && gphoto2 --stdout --capture-movie | ffmpeg -i - -vcodec rawvideo -pix_fmt yuv420p -threads 0 -f v4l2 /dev/video2


    


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