How to add a pause between loops of a GIF?

[Miguel-LlamasLanza]

I use imageio.mimsave("fname.gif", frames, loop=4) to save a GIF from python plots. I would like to add a pause between each loop. Is this possible?

[Pandede]

Use optional argument duration (Reference), it accepts float for all frames or list for one value of each frame.
Pausing the GIF between loops can be done via this tricky method:

import imageio.v2 as iio

frames = iio.mimread("imageio:newtonscradle.gif")
# The default duration of each frame
default_duration = 50
# The lagging
lag = 1000
# Pause the GIF by extending the duration of the last frame
duration = [default_duration] * (len(frames)-1) + [lag]
iio.mimwrite('paused.gif', frames, loop=4, duration=duration)

Note that, you may find out the frame duration with imageio.v3.immeta:

import imageio.v3 as iio
meta = iio.immeta("imageio:newtonscradle.gif")
print(meta['duration'])  # 50