Error at save animation with pillow #15678
Description
Bug report
Bug summary
line 575 of animation.py use Image.frombytes to load a BytesIO, this will lead to an exception -- not enough image data.
seems we can't feed bytes of .png to frombytes from the first question-comment of this SO question
Code for reproduction
import numpy as np
from matplotlib import animation
import matplotlib.pyplot as plt
from mpl_toolkits.mplot3d import Axes3D
emb = np.random.random_sample((1000,3))
fig = plt.figure("bug_report")
ax = Axes3D(fig)
ax.set_xlabel('x')
ax.set_ylabel('y')
ax.set_zlabel('z')
ax.set_xlim3d(left=-1,right=1)
ax.set_ylim3d(bottom=-1,top=1)
ax.set_zlim3d(bottom=-1,top=1)
batch=50
def animate(i):
emb_part = emb[i*batch:(i+1)*batch]
ax.scatter(xs=emb_part[:, 0], ys=emb_part[:, 1], zs=emb_part[:, 2])
return ax
ani = animation.FuncAnimation(fig=fig, func=animate, frames=len(emb)//batch + 1, interval=0.01*1000, blit=False, repeat=False)
ani.save("/Users/zac/Downloads/ani.gif", fps=30, writer='pillow')Actual outcome
# ....
ValueError: not enough image data
During handling of the above exception, another exception occurred:
# ....
actually, if we use plt.show() before ani.save, this exception wont appear, but we will get only some last parts of the animation, example as this
Expected outcome
normally saved gif pic
example as this
Matplotlib version
- Operating system: MacOSX
- Matplotlib version: 3.0.3
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.7.3
- Jupyter version (if applicable):
- Other libraries: numpy