Error when the input tif file consisting of 3D images

[Anti-Involution]

Your setup:

1. Operating System (Linux, MacOS, Windows): MacOS
2. Hardware type (x86, ARM..) and RAM: x86
3. Python Version (e.g. 3.9): 3.9
4. Caiman version (e.g. 1.9.12): 1.9.16
5. Which demo exhibits the problem (if applicable):
6. How you installed Caiman (pure conda, conda + compile, colab, ..): pure pip
7. Details: When my input is a tif file which consists of 160 images(size: 512*512*3), I got the following error:

Traceback (most recent call last):
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/mesmerize_core/algorithms/mcorr.py", line 67, in run_algo
    mc.motion_correct(save_movie=True)
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/caiman/motion_correction.py", line 242, in motion_correct
    mi = min(mi, next(iterator).min()[()])
  File "/Library/Frameworks/Python.framework/Versions/3.9/lib/python3.9/site-packages/caiman/base/movies.py", line 2160, in load_iter
    vol[i] = y.asarray()
ValueError: could not broadcast input array from shape (512,512,3) into shape (512,3)

[Anti-Involution]

Anyone meets this problem?

[EricThomson]

Things tend to break if you are running on fewer than 400 images. We should create a more explicit warning/error about this.