HTTP error – Uploading large videos

Hello,

I have a problem uploading large videos to WordPress, what is stranger is that there are sites from which I get the error(my office, hom, etc.) and others don’t(others offices).

1. define (‘WP_MEMORY_LIMIT’, ‘512M’); (wp-config.php)
2. I tested the filter ‘wp_image_editors’
4. I did tests with different Browsers and erasing the cache.
5. I did tests with simple names to avoid errors in this.
6. I did tests with another template and deactivating all plugins.
7. I did tests with this configuration in .htaccess:

<IfModule mod_security.c>
SecFilterEngine Off
SecFilterScanPOST Off
</IfModule>

8. I did tests with this configuration in functions.php:

add_filter( 'wp_image_editors', 'change_graphic_lib' );

function change_graphic_lib($array) {
  return array( 'WP_Image_Editor_GD', 'WP_Image_Editor_Imagick' );
}

9. My php.ini:

memory_limit = 516M
upload_max_filesize = 516M
max_input_time = 300
max_execution_time = 300
post_max_size = 516M

I talked to my hosting provider and he says the problem is not with the Hosting if I’ve already been able to upload videos from somewhere.

Thanks!