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  • Websites made ​​with MediaSPIP

    2 mai 2011, par

    This page lists some websites based on MediaSPIP.

  • Creating farms of unique websites

    13 avril 2011, par

    MediaSPIP platforms can be installed as a farm, with a single "core" hosted on a dedicated server and used by multiple websites.
    This allows (among other things) : implementation costs to be shared between several different projects / individuals rapid deployment of multiple unique sites creation of groups of like-minded sites, making it possible to browse media in a more controlled and selective environment than the major "open" (...)

  • Les tâches Cron régulières de la ferme

    1er décembre 2010, par

    La gestion de la ferme passe par l’exécution à intervalle régulier de plusieurs tâches répétitives dites Cron.
    Le super Cron (gestion_mutu_super_cron)
    Cette tâche, planifiée chaque minute, a pour simple effet d’appeler le Cron de l’ensemble des instances de la mutualisation régulièrement. Couplée avec un Cron système sur le site central de la mutualisation, cela permet de simplement générer des visites régulières sur les différents sites et éviter que les tâches des sites peu visités soient trop (...)

Sur d’autres sites (9137)

  • lavc : Drop deprecated emu edge functionality

    5 décembre 2016, par Vittorio Giovara
    lavc : Drop deprecated emu edge functionality

    Deprecated in 01/2014.
    • [DBH] libavcodec/avcodec.h
    • [DBH] libavcodec/options_table.h
    • [DBH] libavcodec/utils.c
    • [DBH] libavcodec/version.h

  • how to improve edge interpolation of rotation in moviepy

    15 juillet 2021, par OneWorld

    I tried changing the interpolation method of rotation from 'bilinear' to 'bicubic' in the below, but it didn't seem to improve the edge interpolation. (it still looks a little bit jagged)

    


    I was wondering what I need to do to improve this ?

    


    import moviepy.editor as mped
import sys
import numpy as np

bgrd_width = 200
bgrd_height = 200
sunset = mped.ImageClip("sunset200x100.jpg", duration=1).set_position((1, 1))
bgrd = mped.ColorClip(size=(bgrd_width, bgrd_height), color=np.array([200, 200, 200]).astype(np.uint8), duration=3).set_position((0, 0))

angle = 56
interpolation = 'bicubic'

rotated_sunset = sunset.add_mask().rotate(angle, unit='deg', expand=True, resample=interpolation).set_duration(3)
stacked_clips = mped.CompositeVideoClip([bgrd, rotated_sunset], size=[bgrd_width, bgrd_height])

stacked_clips.write_videofile(f'sunset_rotated_{angle}_{interpolation}.mp4', fps=5)



    


    See attached comparison image of bilinear and bicubic interpolation.
enter image description here

    


    Adding to this, I have seen now that the inside of the image does improve in quality with cubic, compared with nearest neighbour.

    


    enter image description here

    


    The reason for the smooth inside, and jagged asset edge is because there's no pixel to sample from outside the boundary of the image, when interpolation is applied.

    


    I wrote some moviepy code, which adds a black margin (which actually turns transparent) and mask and then rotates. With bicubic interpolation it creates course, black lines, with a strange blend. However, with bilinear interpolation, the lines are much less apparent.

    


    # Add margin, add mask, rotate with interpolation of transparent 2 pixel border.
original_clip = mped.ImageClip("sunset200x100.jpg")
opaque_color = np.array([255, 255, 255]).astype(np.uint8)
margin_color = np.array([0, 0, 0]).astype(np.uint8)
margin_added_clip = original_clip.margin(2, color=margin_color)  # adds 2 pixel black border.
color_mask = mped.ColorClip(size=(original_clip.size), color=opaque_color).margin(2, color=margin_color)
mask = color_mask.to_mask()  # converts to grayscale with values between 0 and 1
masked_clip = margin_added_clip.set_mask(mask)  # adds the float mask to the clip
rotated_sunset = masked_clip.rotate(56, unit='deg', expand=True, resample="bicubic")
rotated_sunset.save_frame("sunset_rotated_56_degrees_moviepy_with_2px_mask.png")  # uses imageio to save the frame.


    


    enter image description here

    


    However,

    


    If you switch from bicubic to bilinear, it looks a lot better :-

    


    enter image description here

    


  • hevcdsp : separated sao edge filter and pixel restore funcs

    4 février 2015, par Seppo Tomperi
    hevcdsp : separated sao edge filter and pixel restore funcs

    Reviewed-by : Michael Niedermayer <michaelni@gmx.at>
    
Reviewed-by : Christophe Gisquet <christophe.gisquet@gmail.com>
    
Reviewed-by : Mickaël Raulet <mraulet@insa-rennes.fr>
    • [DH] libavcodec/hevc_filter.c
    • [DH] libavcodec/hevcdsp.c
    • [DH] libavcodec/hevcdsp.h
    • [DH] libavcodec/hevcdsp_template.c

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