RewriteEngine On

RewriteCond %{REQUEST_URI} ^/$ [OR]
RewriteCond %{REQUEST_URI} ^/index\.php$
RewriteRule ^(.*)$ /index.php [L]

RewriteCond %{QUERY_STRING} ^v=([a-zA-Z0-9\_\-\~\!\*]{8})$
RewriteRule ^$ /view.php?v=%1 [L,QSA]

RewriteRule ^admin\.php$ /admin.php [L]