WordPress at a glance
filter is not described

get_media_item_args filter-hook . WP 3.1.0

Filters the arguments used to retrieve an image for the edit image form.

Usage

add_filter( 'get_media_item_args', 'filter_function_name_8011' );
function filter_function_name_8011( $args ){
	// filter...

	return $args;
}
$args(array)
An array of arguments.

Where the hook is called

get_media_item()
get_compat_media_markup()
wp-admin/includes/media.php 1395
$r = apply_filters( 'get_media_item_args', $args );
wp-admin/includes/media.php 1636
$args = apply_filters( 'get_media_item_args', $args );

Where the hook is used (in WP core)

Does not used.