Change WordPress upload_dir per post type.

post-type-upload.php

<?php
	/**
	 * Change upload dir for video post type
	 * Media files that comes from video post type will be stored under
	 * wp-content/uploads/video/year/month/file-name.blah
	 * use "upload_dir" filter
	 * @param $args
	 * @return mixed
	 */
	public function video_upload_directory( $args ) {
		$id        = $_REQUEST['post_id'];
		$parent    = get_post( $id )->post_parent;
		$video_dir = "/videos";

		// Check the post-type
		if ( "video" == get_post_type( $id ) || "video" == get_post_type( $parent ) ) {
			$args['subdir'] = $video_dir . $args['subdir'];
			$args['path']   = $args['basedir'] . $args['subdir'];
			$args['url']    = $args['baseurl'] . $args['subdir'];
		}

		return $args;
	}