Limit to recording Issue

[MTUser]

When i used SetTimeout to control the Limit to recording the the milliseconds are not calculated as per the Settimeout given

For Eg if i give Settimeout to 15000 ms so the Record button Progress event sometime calculate only 13 seconds it shud be 14 seconds starting from 0 EG 0:00 to 0:14 but it shows sometime 0.00 to 0:13 when i analyzed i found that recording milliseconds are calculated wrongly as per the Settimeout functionality,please look into the issue as soon as possible and also provide me with the Solution with a Good example.

Can you please tell me how milliseconds are calculated on what basis.
Can you please explain me this line as also mentioned below in the example

progress: function(milliseconds){ // will be called in a <1s frequency with the current position in milliseconds

please give me solution as soon as possible..

Thanks.