After contacting the support, I have learned that the Xibo Player for Windows is just for 32 bit system, and therefore, it can only accommodate max of 3GB RAM no matter how much more RAM your hardware has.
And for 3GB RAM, it is pretty limited to low-resolution images and HD quality video clips with a minimal footprint (1080p max)
So I adjusted those files, resize and it is now working OK
The company said they are working on 64-bit version in the future development though, can’t wait to see it
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