macOS: Recorded video got stretched
I'm using the ANE for macOS, but the result video look weird, do you know why?

While it should be:

Thanks,
Windows ANE works just fine...
This usually happens when feeding video dimensions to the encoder it doesn't like (the width in particular). What are your values?
It's 550x400
Try a value you can divide by 16, in this case 544, or anything else(you can begin with super safe ones like 640 x 480 etc.). The mp4 encoders on iOS / mac have issues with other values which demonstrate exactly like your screenshot.
Alright, after trying your suggestion, I already got a clearer video, but there are a black border at the right side & bottom of the video...

Can you share your capture code and your stage dimensions?