Last frame of .mp4 not read by LoadMovieIntoTexturesDemo

Programming Help
1

OS: Windows 10
Matlab ‘9.10.0.1739362 (R2021a) Update 5’
PTB: '3.0.17 - Flavor: beta - Corresponds to SVN Revision 12153

I have been trying to preload the textures from .mp4 files for an experiment, but the last texture of my movies is never loaded. I have this same issue when using the demo LoadMovieIntoTexturesDemo.m, i.e.

LoadMovieIntoTexturesDemo([pwd filesep ‘test.mp4’])

…loads 119 textures, but the test.mp4 has 120 frames.

I’m positive it has 120 frames, b/c:

x = VideoReader([pwd filesep ‘test.mp4’]);
disp(x)
VideoReader with properties:

General Properties:
Name: ‘test.mp4’
Duration: 2
CurrentTime: 0.0167
NumFrames: 120

Video Properties:
Width: 1920
Height: 1080
FrameRate: 60
BitsPerPixel: 24
VideoFormat: ‘RGB24’

also

size(read(x))

ans =

    1080        1920           3         120

Can anyone explain why the demo isn’t giving me the last frame, and is there some way to get it?

Thanks