Hi,
Thanks for sharing your requirement here at Freelancer, I will be more than happy to help you.
I have reviewed your project details and understand that video is not playing via mp4upload on one script but the other script is playing without any issue, so please allow me check and fix the same.
I would like to mention that I will take payment only after completion of this job, I will first finish this job and then ask you to award and pay at the same time to maintain trust.
Regards,
Kapil