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troubleshooting Question

Calculate the Kbps (kilobits per second) of a MP3 file.

Avatar of cunoc
cunoc asked on
17 Comments1 Solution881 ViewsLast Modified:
Hi all Experts,
Please help me with the math problem I have and thank you very much in advance.
Calculate the Kbps (kilobits per second) of a MP3 file.

If you have a 5 MB file with a length of 3 minutes, you would use the formular below to find out the Kbps (kilobits per second) of a MP3 file.

1K = 1024 bytes
1M = 1024K

1 hour   = 60 minutes
1 minute = 60 seconds

5MB = 5 * 1024 * 1024 bytes = 5242880 bytes

5242880 * 8 / 180 / 1000 = ~233 kbps

<html xmlns="http://www.w3.org/1999/xhtml">
<script type="text/javascript">
var Hour = 0;
var Minute = 3;
var Second = 0;

function F_Calculate_MP3_Bitrate_Forward ()
   var i = parseFloat(document.getElementById('Calculate_MP3_Bitrate_Forward').value);
   var m = "";

   if (!isNaN(i)) m = Math.ceil(((i * 1024 * 1024) * 8 / ((Hour * 3600) + (Minute * 60) + (Second * 1)) / 1000) / 1024 / 1024);
      document.getElementById('Calculate_MP3_Bitrate_Reversed').value = m;

function F_Calculate_MP3_Bitrate_Reversed ()
   var i = parseFloat(document.getElementById('Calculate_MP3_Bitrate_Reversed').value);
   var m = "";
   if (!isNaN(i)) m = Math.ceil(((i * 1024 * 1024) / 8 * ((Hour * 3600) + (Minute * 60) + (Second * 1)) * 1000) / 1024 / 1024);
      document.getElementById('Calculate_MP3_Bitrate_Forward').value = m;

function setbitrate_Hour(in_hour)
   Hour = in_hour;

function setbitrate_Minute(in_minute)
   Minute = in_minute;

function setbitrate_Second(in_second)
   Second = in_second;



<br />

<table border="0" cellpadding="0" cellspacing="0" style="border-collapse: collapse" width="98%">
<td width="40%">
  <label><input id="Calculate_MP3_Bitrate_Forward" onKeyUp="F_Calculate_MP3_Bitrate_Forward()"/><font color="#000000" face="Tahoma" style="font-size: 8pt">&nbsp;File Size (MB)</font></label>

<td <td width="20%"><select name="Hour" id="Hour" onchange="setbitrate_Hour(this.options[this.selectedIndex].value);">
<option value="0" selected="selected">0 hour</option>
<option value="1">1 hour</option>
<option value="2">2 hours</option>

<td <td width="20%"><select name="Minute" id="Minute" onchange="setbitrate_Minute(this.options[this.selectedIndex].value);">
<option value="1">1 minute</option>
<option value="2">2 minutes</option>
<option value="3" selected="selected">3 minutes</option>
<option value="4">4 minutes</option>
<option value="5">5 minutes</option>
<option value="6">6 minutes</option>
<option value="7">7 minutes</option>
<option value="8">8 minutes</option>
<option value="9">9 minutes</option>
<option value="10">10 minutes</option>
<option value="11">11 minutes</option>

<td <td width="20%"><select name="Second" id="Second" onchange="setbitrate_Second(this.options[this.selectedIndex].value);">
<option value="0" selected="selected">0 Second</option>
<option value="1">1 Second</option>
<option value="2">2 Seconds</option>
<option value="3">3 Seconds</option>
<option value="4">4 Seconds</option>
<option value="5">5 Seconds</option>
<option value="6">6 Seconds</option>
<option value="7">7 Seconds</option>
<option value="8">8 Seconds</option>
<option value="9">9 Seconds</option>
<option value="10">10 Seconds</option>
<option value="11">11 Seconds</option>

<td width="30%">
  <label><input id="Calculate_MP3_Bitrate_Reversed" onKeyUp="F_Calculate_MP3_Bitrate_Reversed()"/><font color="#000000" face="Tahoma" style="font-size: 8pt">&nbsp;(Kbps)</font></label>


Avatar of Michel Plungjan
This problem has been solved!
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