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Topic: Bitrate Calculator (Read 5498 times) previous topic - next topic
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Bitrate Calculator

Some time ago I remember using a little programme which calculated bitrate....it was great for fitting mp3's on to my portable.
I cannot find it, Iv'e searched the Forum and tried Google to no avail.

Can anyone help?

auldyin

Bitrate Calculator

Reply #1 –
bitrate?

Aren't you looking for a program more like dupeless?

Bitrate Calculator

Reply #2 –
Thanks for response.
What I was looking for was a little programme which allowed you to calculate the bitrate which would fit eg:

40 minutes of music into 64MB of memory

auldyin

Bitrate Calculator

Reply #3 –
Quote
What I was looking for was a little programme which allowed you to calculate the bitrate which would fit eg:
40 minutes of music into 64MB of memory

The equation for that calculation is fairly simple, would you really want a special program for it?    OK, take it easy. 

(1) The equation:
bitrate[kbps] = space[kbits] / time[seconds]

(2) unit conversions:
time[seconds] = time[minutes] * 60
space[bits] = space[bytes] * 8
space[K] = space[M] * 1024

(3)The equation for other units - (1) and (2) combined:
bitrate[kbps] = 8*1024/60 * space[MB] / time[minutes] = 136.53 * space[MB] / time[minutes]
bitrate[kbps] = 8*1024 * space[MB] / time[seconds] = 8192 * space[MB] / time[seconds]

That's the nice theory, but I'm not sure about two practical details:
-is the Kilo/Mega conversion correct for MP3 bitrates? or is the factor 1000 instead of 1024? does anybody else know that?
-there may be some overhead related to the actual storing of the files, so you might want to do your calculations with some "headroom". for instance, add a minute or two to the real time. this gives you a slightly lower bitrate (smaller files). just test it for yourself to see how much the "ideal" factor has to be adjusted.

Have fun! 

Bitrate Calculator

Reply #4 –
Quote
-is the Kilo/Mega conversion correct for MP3 bitrates? or is the factor 1000 instead of 1024? does anybody else know that?

HDD space:
1 MB = 1024 KB
1 KB = 1024 Bytes

Bitrate:
1 kbps = 1000 bits/sec.

=>
bitrate[kbps] = 8*1024*1024/(60*1000) * space[MB] / time[minutes] = 139.8 * space[MB] / time[minutes]
bitrate[kbps] = 8*1024*1024/1000 * space[MB] / time[seconds] = 8388 * space[MB] / time[seconds]

Bitrate Calculator

Reply #5 –
Thanks guys....................doddle!!!!

auldyin

Bitrate Calculator

Reply #7 –
This is what you need.
At the bottom of the page. Audioactive Calculator. Freeware.

Bitrate Calculator

Reply #9 –
Quote
Ph34r my gh3y HTML skillz.

Just hit the http:// code button dude.  Then you \/\/][|_|_  B3  4|3|_3  70  |>0$7 |_][|\|]{$  |_][]{3  4  1337  |-|4><0R.

SEE!!

Translation:  . . . will be able to post links like an elite hacker.
gentoo ~amd64 + layman | ncmpcpp/mpd | wavpack + vorbis + lame

Bitrate Calculator

Reply #10 –
Quote from: Lodgikal on
HDD space:
1 MB = 1024 KB
1 KB = 1024 Bytes

Bitrate:
1 kbps = 1000 bits/sec.

=>
bitrate[kbps] = 8*1024*1024/(60*1000) * space[MB] / time[minutes] = 139.8 * space[MB] / time[minutes]
bitrate[kbps] = 8*1024*1024/1000 * space[MB] / time[seconds] = 8388 * space[MB] / time[seconds]

If anyone is still interested, here is a simple batch script using those methods for video bitrate calculation. Simply copy the code below into "Video_BITRATE_Calc.bat" and run whenever desired.

In this script I am forcing the results to be displayed as even integers. If you would prefer to allow odd integers when they are produced, simply delete these lines:
  • SET /A _output/=2
  • SET /A _output*=2
  • SET /A _video/=2
  • SET /A _video*=2
    - M.

Code: [Select]
@echo off
color 02
title Video BITRATE Calc...
cls
echo.
echo -----------------------------------------------
echo              Video BITRATE Calc...
echo -----------------------------------------------
echo.
echo PLEASE NOTE:
echo   1) Time = MINUTES (every six sec = 0.1 min)
echo   2) Bitrate = CBR (Constant bitrate in kbps)
echo   3) Size = MiB (file size as shown on drive)
echo   4) Output is adjusted to show EVEN integers
echo.
echo -----------------------------------------------
echo.
set /P  _time=.   Play Length: 
set /P _audio=. Audio Bitrate: 
set /P  _size=.  Desired Size: 
SET /A _output=(( 8388 * _size ) / ( _time * 60 ))
SET /A _output/=2
SET /A _output*=2
SET /A _video=( _output - _audio )
SET /A _video/=2
SET /A _video*=2
echo.
echo -----------------------------------------------
echo.
echo OVERALL Bitrate: %_output%
echo   VIDEO Bitrate: %_video%
echo.
title ... finished!
pause