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• Revision 80e5326cf2 : Use offset mode info when filling pc tree. Use the appropriate subblock offset

  23 mai 2014, par Alex Converse

  Changed Paths :
   Modify /vp9/encoder/vp9_encodeframe.c

  
  
  Use offset mode info when filling pc tree.

  Use the appropriate subblock offset mode info rather than the parent
  block base, when filling mbmi in the pc tree in nonrd_use_partition.
  This mimics what is done in the vertical case and what is done for
  both cases in nonrd_pick_partition.

  This change has little practical effect at the moment since in speed 5
  rt horizontal and vertical partitions are currently only used unpaired
  at edges of the picture.

  Change-Id : I4632f66ca84086dac56c7d36b45ddbe38a06f42a

• Matplotlib : animation saved with trace

  25 mai 2020, par Thiziri yoor

  In the following Python code, I am trying to make an animation of a 2 rotating vectors around the origin. I am using matplotlib 3.2.1 and Python 3.8.2 on Ubuntu 20.04.

  



  
import numpy as np
import matplotlib.pyplot as plt

from matplotlib.animation import FuncAnimation


r = 2.0

def circle(phi):
    return np.array([r*np.cos(phi), r*np.sin(phi)])

fig, ax = plt.subplots(figsize=(10,6))
ax.axis([-3.5*r,3.5*r,-2.5*r,2.5*r])
ax.get_xaxis().set_visible(False)
ax.get_yaxis().set_visible(False)

# set equal aspect
ax.set_aspect("equal")

point, = ax.plot(0, r, marker="o")


traj = plt.Circle((0,0), r, fill=False, color='black')
ax.add_artist(traj) # draw the circular trajectory

def update(phi):

    x, y = circle(phi)
    point.set_data([x], [y])
    er_vec = np.array([0.5*x, 0.5*y])
    eθ_vec = np.array([-0.5*y, 0.5*x])


    er_arr = plt.arrow(x, y, dx=er_vec[0], dy=er_vec[1], head_width=0.1, head_length=0.2, color='gray')
    eθ_arr = plt.arrow(x, y, dx=eθ_vec[0], dy=eθ_vec[1], head_width=0.1, head_length=0.2, color='grey')

    annot_er = plt.text(1.7*x, 1.7*y, r'$\mathbf{e}_r$', fontsize=11)
    annot_eθ = plt.text(1.1*(x-0.5*y), 1.1*(y+0.5*x), r'$\mathbf{e}_\theta$', fontsize=11) 

    ax.add_artist(er_arr)    
    ax.add_artist(eθ_arr)
    ax.add_artist(annot_er)
    ax.add_artist(annot_eθ)
    return point, er_arr, eθ_arr, annot_er, annot_eθ

anim = FuncAnimation(fig, update, interval=10, blit=True, repeat=False, frames=np.linspace(0, 2.0*np.pi, 360, endpoint=False))
plt.show()


  



  The code above runs smoothly and without any issues.
This is a screenshot of the animation :

  



  

  



  However, when I try to save the animation to an mp4 video :

  



  anim.save('anim-issue.mp4', writer='ffmpeg')


  



  the animation in the video appears with traces which, something like this screenshot :

  



  

  



  Could someone help me fix that issue with the video animation ?

  



  I appreciate your help.

  



  Edit 1 : According to this answer this is due to blit=True. But that doesn't solve the issue here, since the arrows have no set_position method.

  



  Edit 2 : I found another related question with the same issue I described above but I don't know how to adapt my code to make it work as expected in both cases (plt.show, anim.save).

  


• Fix configure problem with out-of-source-tree build for fate-related .mak files in...

  26 juin 2011, par Paul Sterne

  Fix configure problem with out-of-source-tree build for fate-related .mak files in...