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work out file size from bit rate and time
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p4000
Newbie
_ 		31. January 2006 @ 02:08 _ Link to this message    Send private message to this user   
Hi, i feel very silly havign to ask this but,

does anyone know the formula to use to calculate file size when you know the bit rate and time.

eg

1 hr of video encoded @ 10Mbits / sec

what would the file size be in Giga "bytes"?

i have tried to work it out but i keep comming up with the wrong figure and this is really anoying me now!!

thanks
p4000
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celtic_d
AfterDawn Addict
_ 		31. January 2006 @ 04:29 _ Link to this message    Send private message to this user   
1Byte = 8bits. 1024 bytes per kiloByte, 1024 kB per megaByte.
For video 1,000 is used instead of 1024.

With video, when it is in a container (esp with audio) there is overhead, so the size isn't simply a matter of bitrate*time.
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p4000
Newbie
_ 		31. January 2006 @ 05:36 _ Link to this message    Send private message to this user   
Yep, thanks - i've actually found the formuala now so i'll print it here in case anyone else needs to know / wants to know.

bit rate (kbps) x file length (seconds) / 8 = file size (KB)

obviously you'll have to convert Kilobytes into Mb's or Gb's or you can use this very handy calculatorhttp://www.clipstream.com/help/filesize.shtml
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Minion
AfterDawn Addict
_ 		2. February 2006 @ 10:10 _ Link to this message    Send private message to this user   
What I use is a "Bitrate Calculator" called "PowerBit" which will tell you what bitrate to use Based on the Length of the Video File and the audio bitrate you are going to use so the Video fits on a DVD-R.....

I have been useing it for a Couple Years now and it has allways worked Prefectly for me.....Do a Google search and you will find it easilly enough....

Cheers
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p4000
Newbie
_ 		2. February 2006 @ 23:26 _ Link to this message    Send private message to this user   
thanks minion but it was trying to acheive the oposite.

i neeeded the work out file size of a elementary video file based on the bit rate that would be used to encode and the length of the video.

example; i use a 25Mpbs encoder, i know that i will need to encode 5500 hours of video @ this rate, how much storage do i need?

your method requires the work to have been done first.

good try though, but if you see a few post up i have already found a solution.

thanks anyway
p4000
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