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    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.
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    12 avril 2011, par

    Chaque utilisateur dispose d’une page de profil lui permettant de modifier ses informations personnelle. Dans le menu de haut de page par défaut, un élément de menu est automatiquement créé à l’initialisation de MediaSPIP, visible uniquement si le visiteur est identifié sur le site.
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    15 novembre 2010, par

    Accéder à la configuration et ajouter des langues prises en compte
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Sur d’autres sites (9124)

  • Access files at the same time from different folders and save in third folder

    5 avril 2019, par Manza Ari

    I want to access files from two different folders process them and save the resultant file in third folder. I am making a video file from images belong to two different folders.

  • FFMPEG : Save extracted frames to temporarily in ssd then flush to hdd

    2 février 2019, par Rishi Kataria

    I am trying to extract the frames from a video file. My HDD is slow and is acting as a bottleneck, so I wanted to save the frames to my SSD, and as it gets full, send those frames to my hard drive. so periodically flushing the frames to the hard drive. I was hoping there would be some solution for that.

    This is what I am using now :

    ffmpeg -y -hwaccel cuda -i vid.mkv %%d_frame.png

    Cheers !

  • attempting to save FuncAnimation changes the animation

    25 mars 2024, par pibion

    I am attempting to create and save an animation of a time-varying vector field using matplotlib's FuncAnimation. When I run the animation without attempting to save it, it updates smoothly as expected. However, when I try to save the animation, the vectors increase in length and the animation only appears to update a few times. I've been able to record the screen to get a video file, but I'd like to understand how to save the animation to a video in python.

    


    Here is the code to create the vector field animation. I ran this in a local jupyter notebook using python 3.9.12 on Windows.

    


    %matplotlib notebook
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

x_min, x_max = -20, 20
y_min, y_max = 0, 25
wire_x = -4
wire_y = 17

# Define the vector field function (example: rotating vector field)
def vector_field(x, y, t):
    x = x - wire_x
    y = y - wire_y
    r = np.sin(t) / (x**2 + y**2)
    u = -r * y
    v = r * x
    return (u, v)

# Define grid
x = np.linspace(x_min, x_max, 20)
y = np.linspace(y_min, y_max, 20)
X, Y = np.meshgrid(x, y)

# Create animation
fig, ax = plt.subplots(1,1)
ax.set_aspect('equal')
ax.set_xlim(x_min, x_max)
ax.set_ylim(y_min, y_max)
ax.set_xlabel('X (m)')
ax.set_ylabel('Y (m)')

u, v = vector_field(X, Y, 1)

quiver = ax.quiver(X, Y, u, v)

time_arr = np.linspace(0,20,200)

plt.show()

def update_quiver(num):
    t = num * 0.1  # Time step
    u, v = vector_field(X, Y, t)
    quiver.set_UVC(u, v)

ani = animation.FuncAnimation(fig, update_quiver, frames=200, interval=50, repeat=False)


    


    This produces an animation whose vectors smoothly vary in length on my computer.

    


    However, when I try to save the animation by adding the lines

    


    writervideo = animation.FFMpegWriter(fps=60) 
ani.save('field_leftWire.mp4', writer=writervideo) 


    


    then the animation changes - the vectors are much longer and it appears to only update a few times throughout the animation.

    


    I'll also note that I had to install ffmpeg and restart my computer as outlined in Installation of FFMPEG for Python in WIndows to get the last two lines to run without error.

    


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