i've try mid-roll video ads with this ova code : 
               
                  '.$uri.' Video Ads
                
               
                   {
                    "ads": 
                        {
                            "controls": {
                                   "skipAd": {
                                      "enabled": true,
                                      "showAfterSeconds": 15
                                   }
                              },
                        "servers": [
                               {
                                  "type": "OpenX",
                                  "apiAddress":  "http://ads.viva.co.id/ads/www/delivery/fc.php",
                                    "allowAdRepetition": true
                               }
                        ],
                        "schedule": [
                           "position": "mid-roll",
                           "startTime": "00:00:10",
                           "zone": "349",
                           "playOnce": false,
                           "notice": {
                           "show": false
                        ]},
                    "debug": {
                          "debugger": "firebug",
                          "levels": "fatal, config, vast_template, vpaid, http_calls"
                    }
                }
           </ova.json>
        </config> 
but mid-roll becoming post-roll ads, it show after main video play, how can i fix this ?
                        
once again, this my ova code