VideoWriter generating unexpected results

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Touraj Tajbakhsh 2023-12-11

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https://ww2.mathworks.cn/matlabcentral/answers/2058979-videowriter-generating-unexpected-results

编辑： Alexander 2024-12-6

I believe the VideoWriter in R2023b has a bug. It can be reproduced with this piece of code:

v = VideoWriter('test.mp4', 'MPEG-4'); % use h264 encoding
v.FrameRate = 30;
v.Quality = 100;
open(v)
    
vidFrame = ones([1920, 1080, 3]);
writeVideo(v, vidFrame);
close(v)

There are black lines appearing in the output video:

I am on MacOS Sonoma 14.1.2 (M2 Ultra).

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Raphaël Nussbaumer 2024-11-7

Confirm @Aishwarya's solution, setting the figure size to a multiple of 8 fixed the problem

hFig = figure('position',[0 0 800 800])

Alexander 2024-12-6

编辑：Alexander 2024-12-6

I'm also getting this bug on Apple Silicon version. I've seen people talk about setting the figure size as a multiple of 8 to fix the problem, but both my width and heights are multiples of 8. In fact, the original poster here used 1920x1080, which are also multiples of 8. Can you expand on what you mean by multiple of 8?

By trial and error:

Height dimension doesn't seem to matter

Width is crucial. Get distortion is use some numbers e.g. 456, 458, 460, 462, however 464 works. Also 2x456 = 920 works fine.

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