How do I calculate video playback time?

Hi guys,

I was wondering if someone could tell me how I can calculate video playback time if I know the file size and streaming rate?

For example the video file size is 1500KB which plays at 2400Kbps

Thanks in advance.

Danny

 

Hmmm...I worked this out but if I made a mistake I'm sure some nice person will inform me...

You have a playing rate of 2400 kbps (which is thousand bits per second)...
So this is really 2,400,000 bits per second
Since there are 8 bits in a byte...this translates to 2,400,000 bits per second / 8 bits in a byte = 300,000 bytes per second.

Now, 1,500 KB is 1,500,000 bytes,
So playing 1,500,000 bytes at 300,000 bytes per second equates to
1,500,000 / 300,000 = 5 seconds!

Hope that helps (and hope I got it right!)

 

This is how you can do it inside your video player with actionScript 3:

var totalSeconds:Number = flvControl.playheadTime;
	var totalSeconds2:Number =  flvControl.totalTime;
	var minutes:Number = Math.floor(totalSeconds /60);
	var minutes2:Number = Math.floor(totalSeconds2 /60);
	var seconds = Math.floor (totalSeconds) % 60;
	var seconds2 = Math.floor (totalSeconds2) % 60;
	if (seconds < 10){
		seconds = "0" + seconds;
	}
	if (seconds2 < 10){
		seconds2 = "0" + seconds2;
	}
	timeBox.text =  minutes + ":" + seconds + " / " +  minutes2 + ":" + seconds2;
	
}

Code (markup):

flvControl = Your video MC
timeBox = Dynamic Text Box

Hope this helps you...