[Mjpeg-users] 1024 or 1000 as a multiplier

[Matti Haveri]

What is the proper multiplier in digital video calculations: 1024 or 1000? Or both??

mpeg2enc seems to use 1000 because 2500 kb/s = 2500 000 b/s

mp2enc seems to use 1024 because 224 kbit/s = 229 376 bits/s (= 28 672 bytes/s)

Isn't it true that:

1 B/s = 8 b/s (i.e. 1 byte/s = 8 bits/s)
1 Mb/s = 1024 kb/s
1 kb/s = 1024 b/s

and so on? When is 1000 used as a multiplier?

For example: 2500 000 b/s SVCD video is actually 2441 kb/s with 1024 multiplier. Adding 224 kb/s audio yields 2665 kb/s. The maximum speed for the SVCD MPEG2-data is:

2 x 75 sectors/s =
150 sectors/s =
150 sectors/s * 2324 B/sector =
348600 B/s =
2788800 b/s =
2723,4375 kb/s

This (2723,4375 - 2665) leaves still 58 kb/s for 1-2% muxing mplex overhead + possible padding, right?

--
Matti Haveri <[EMAIL PROTECTED]> <http://www.sjoki.uta.fi/~shmhav/>


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