修改默认时长为0字符串

app/Model/MediaModel.php

@@ -217,7 +217,7 @@ class MediaModel extends Eloquent
                     'user_id'       => $request->token_user_id,
                     'start_time'    => $start_time,
                     'end_time'      => $end_time,
-                    'duration'      => $request->duration??0
+                    'duration'      => $request->duration??"0"
                 ];
 
             }else{