dmr和普通投屏有什么区别,投屏器和盒子哪个更实用更好

{"rich_content":{"text":"投屏dmr是什么意思","spans":null},"video":{"vid":"v038b0950000bs9k54si5klg4p96oti0","duration":47.83,"width":1024,"height":576,"file_size":2279124,"thumb":{"web_uri":"tos-cn-p-0000/19c6b2f34ab646459c1aa55a947118b1","width":640,"height":360,"image_type":null,"mimetype":null,"encrypt_web_uri":null,"secret_key":null,"encrypt_algorithm":null,"extra":null},"video_size":{"high":{"duration":47.83,"file_size":2071075,"w":854,"h":480},"normal":{"duration":47.83,"file_size":1614895,"w":640,"h":360},"ultra":{"duration":47.83,"file_size":2600012,"w":1024,"h":576}},"is_encrypted":null,"sp":null,"md5":"3487b007541af7185b1650a8d1e28f05","tos_key":null,"secret_key":null,"encrypt_algorithm":null,"extra":null}}