matplotlib.animate只保存一个静止帧

Question

修改

更改了显示的代码，以便其他人可以将其删除并重现错误。可以找到以下代码的数据here，包括代码和生成的动画。

import os
import numpy as np
import matplotlib as mpl
mpl.use("Agg")
import matplotlib.pyplot as plt
import matplotlib.animation as animation


if __name__ == '__main__':
    print "Plotting Clevis LVDT Displacements"
    os.chdir(r"F:\BrokenAnimation")
    animation_data = np.loadtxt("animation_data.csv", delimiter=",")
    time = animation_data[:,0] 
    L10 = animation_data[:,1]
    L11 = animation_data[:,2]
    L12 = animation_data[:,3]

    def data_gen():
        t = data_gen.t
        cnt = 0
        L10_iter = data_gen.L10_iter
        L11_iter = data_gen.L11_iter
        L12_iter = data_gen.L12_iter
        while cnt < 35000:
            cnt+=1
            t += 10.0
            yield [-10.25, L10_iter.next()], [10.1875, L11_iter.next()],
                  [L12_iter.next(), -9.0] 
    data_gen.t = 0
    data_gen.L10_iter = iter(np.array(L10))
    data_gen.L11_iter = iter(np.array(L11))
    data_gen.L12_iter = iter(np.array(L12))

    fig, ax = plt.subplots()
    scat = ax.scatter([0.0, 0.0, 0.0], [0.0, 0.0, 0.0])

    ax.set_xlim(-15, 15)
    ax.set_ylim(-10.0, 0.5)
    ax.set_ylim(-0.5, 0.5)
    ax.grid()


    def run(data):
        # update the data
        x, y, z = data
        scat.set_offsets([x, y, z])
        return scat,

    ani = animation.FuncAnimation(fig, run, data_gen,
                                  blit=True, interval=40, # 40msec? implying 25fps?
                                  )

    # This works
    plt.show()

    # Doesn't really save what I see in plt.show()
    ani.save('South_Clevis.mp4') # 435kb file 4 sec long, 25 fps 800x600 887Kbps

我试图绘制下方点位移的时间历程：

y = 0.0处的点是原始位置，动画上下移动点。对于上下文，点表示在35,000秒的时间历程中的LVDT位移，采样率为每秒1。所以每个＆＃34;秒＆＃34;情节应该更新。

比特率似乎不是实际做任何事情的关键字。我安装了ffmpeg，它位于Windows路径上。使用basic writer example（但没有行matplotlib.use("Agg")，因为python抱怨）工作正常并产生可以播放的动画。