Problem upload film

Hi I use vshare in mysite http://www.zakopiec.tv
But i have one problem
When I upload file 1-2 MB is Ok, when I try upload 20MB or bigger after 30-50 secends blank page
Maybe file uu_default_config.pm is wrong setting
"
package uu_default_config;
use strict;
use Exporter;

@uu_default_config::ISA = qw( Exporter );
@uu_default_config::EXPORT = qw($config);

use vars qw($config);
use vars qw($base_dir);

$base_dir = '/home/zakopiec/public_html';

$config = {
config_file_name => 'uu_default_config',
temp_dir => $base_dir . '/templates_c/',
upload_dir => $base_dir . '/video/',
unique_upload_dir => 0,
unique_upload_dir_length => 16,
unique_file_name => 0,
unique_file_name_length => 16,
max_upload => 20971520000,
overwrite_existing_files => 0,
redirect_after_upload => 1,
param_dir => $base_dir . '/templates_c/',
pass_param_dir => 1,
redirect_url => 'http://zakopiec.tv/upload.php',
redirect_using_js_html => 1,
redirect_using_html => 0,
redirect_using_js => 0,
redirect_using_location => 0,
get_data_speed => 1000,
disallow_extensions => '(sh|php|php3|php4|php5|py|shtml|phtml|cgi|pl|plx| mp3|exe|scr|htaccess|htpasswd)',
allow_extensions => '(3gp|mp4|mov|asf|avi|flv|wmv|mpg|mpeg|mpeg4|xvid| divx|3gpp)',
normalize_file_names => 1,
normalize_file_delimiter => '_',
normalize_file_length => 32,
link_to_upload => 0,
path_to_upload => 'http://'. $ENV{'SERVER_NAME'} . '/uploads/',
send_email_on_upload => 0,
html_email_support => 0,
link_to_upload_in_email => 0,
email_subject => 'Uber File Upload',
to_email_address => '[email protected],[email protected]',
from_email_address => '[email protected]',
log_uploads => 0,
log_params => 0,
log_dir => $base_dir . '/templates_c/',
};

1;
"
thx for help