Pyplot animation inserts large padding

Question

fig = plt.figure()
fig.add_subplot(2, 2, 1)
fig.add_subplot(2, 2, 2)
fig.add_subplot(3, 2, (3, 4))

draws as expected

but the animation

import matplotlib.animation as animation

class Animation(animation.TimedAnimation):
    def __init__(self):
        fig = plt.figure()
        fig.add_subplot(2, 2, 1)
        fig.add_subplot(2, 2, 2)
        fig.add_subplot(3, 2, (3, 4))
        animation.TimedAnimation.__init__(self, fig, blit=True)

    def _draw_frame(self, frame_idx): pass

    def new_frame_seq(self): return iter(range(2))

ani = Animation()
ani.save('test.mp4')

inserts much padding

This can be remedied via fig.subplots_adjust(left=0, right=1, bottom=-.5, top=1) (note negative bottom), but it changes the originally intended proportions. Additionally, plt.show() at end of animation draws same as direct plot (without subplots_adjust), but it's only the last frame.

How to make animation pad same as direct plot, or otherwise remove this padding? matplotlib 3.4.3, Windows 10

Answer 1

Can reduce height via figsize, calibrating back and forth with top and bottom. But this shouldn't be needed.