To upload big video files, you need to edit php.ini file in your server.
You can try following values
If you are on shared hosting with no access to php.ini, try adding following line to .htaccess filemax_execution_time = 600
max_input_time = 600
memory_limit = 32M
register_globals = On
post_max_size = 800M
file_uploads = On
upload_max_filesize = 800M
php_value max_input_time 600
php_value max_execution_time 600
php_value post_max_size 200M
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