http error when uploading video in wordpress

Hello, We are developing a website similar to youtube. When we try to upload videos in the library/media add new we receive an http error. We have increased file size limits and php through our host and know that is not the problem. Is it wordpress or the plugin or theme? Thanks for any help

It’s hard to say to check few things but it’s more a job instead of suggestion few things which you have already tried to change the memory limit. If you’re interested in, I can take a look and find the issue by purchasing the service from the link below: