我正在处理一个脚本,该脚本沿x轴移动一系列数据点的垂直线。该动画与plt.show
正常工作,但我无法输出电影文件。请注意,我对Python很新,尽管我一直在玩它一两年。该脚本是通过将this tutorial中的第一个脚本与this previous stack overflow question的答案中提供的脚本相结合而创建的。这条线最终将在静态数据线图上移动,我在这里将其作为对角线呈现。Matplotlib动画未正确保存
电影文件被输出为具有正确的时间长度(1分10秒),但是应该从最左边移动到最右边每秒1点的线仅移动几个像素输出视频。
任何帮助,您可能能够提供解决这个问题将不胜感激。
编辑:我在Ubuntu 14.04上运行Python 2.7.6。
这里是我的重复性代码:
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
import time
# Simulated background data
x = np.linspace(0,61,62)
y = np.linspace(0,6,62)
# Set up the figure, the axis, and the plot element we want to animate
max_height = 6 # max height of y-axis
n_pts = 61 # max length of x-axis
# Original location for progress line
y1 = [0, max_height]
x1 = [0, 0]
fig = plt.figure() # Initialize figure
#ax = fig.add_subplot(111) # Intialize axes
ax = plt.axes(xlim=(0, n_pts), ylim=(0, max_height)) # Set axes limits
line, = ax.plot([], [], lw=2) # Initialize line
# draw the data to the 'background'
line1, = ax.plot(x, y, color='black')
# initialization function: plot the background of each frame
def init():
line.set_data(x1, y1)
return line,
starttime=time.time()
mytimer=0
mytimer_ref=0
# animation function. This is called sequentially
def animate(i):
t = time.time() - starttime
mytimer = t + mytimer_ref
x1 = [mytimer,mytimer]
line.set_data(x1, y1)
return line,
# call the animator.
anim = animation.FuncAnimation(fig, animate, init_func=init,
frames=61, interval=1000)
# save the animation as an mp4. This requires ffmpeg or mencoder to be
# installed. The extra_args ensure that the x264 codec is used, so that
# the video can be embedded in html5. You may need to adjust this for
# your system: for more information, see
# http://matplotlib.sourceforge.net/api/animation_api.html
writer = animation.writers['ffmpeg'](fps=1)
anim.save('demo.mp4',writer=writer,dpi=dpi)
plt.show()
编辑下面的脚本创建的电影,并将其保存为MP4。现在的问题是,虽然有61帧动画,但我无法让电影在那里停下来。它每次都会进入100帧。我知道这个问题现在有点老,但任何帮助非常感谢!
我试图手动设置x轴,它限制了屏幕上显示的内容,但动画仍然继续超出显示的轴。
import numpy as np
from matplotlib import pyplot as plt
from matplotlib import animation
from time import time
from scipy.interpolate import interp1d
max_height = 6 # max height of y-axis
n_pts = 62 # max length of x-axis
x = np.linspace(0,61,62)
y = np.linspace(0,6,62)
# New figure with white background
fig = plt.figure(facecolor = 'white')
ax = plt.axes(aspect=1) # Set axes limits
# Original location for progress line
y1 = [0, max_height]
x1 = [0, 0]
# initialize line
plt.plot(x, y) #plot background
line, = ax.plot([], [], lw=2)
def update(frame):
x1 = frame
line.set_data(x1, y1)
# Return the modified line
return line,
anim = animation.FuncAnimation(fig, update, interval=1000, blit=True)
anim.save('line.mp4', writer='ffmpeg')
plt.show()
仍然没有答案,但不知何故,保存动画时忽略'interval'选项。奇怪的是,对“animation.FuncAnimation”的调用实际上并不创建动画。如果您包含一个保存每个mytimer值的变量,并打印此变量,则只有在调用'anim.save'后才能看到输出 - 但之前不会。然而,'anim.save'只是调用你的动画61次,但不遵守'interval'。 – Schorsch
感谢您的反馈。这给了我一点工作,我会更新,如果涉及到任何事情。 –