On Mon, 14 Mar 2005, Matti Haveri wrote:
> Sorry for the delayed quote and nit-picking but where does that
> "427000000" come from?
I don't remember. Likely it was a slip of the finger. It could
also have been I was including an extra reserve for other things
such as transitions (they're relatively small at a few MB each but
if a DVD needs 30 or 40 of them it adds up).
Could also have been adding in a couple extra percent to account
for the multiplexing overhead. A couple percent doesn't sound like
much but it is almost 100MB when talking about a DVD.
> BTW, is it OK to assume in these kind of calculations that 1 kb/s
> always equals 1000 b/s in the data _rates_? And 1 kb equals 1024 b
> otherwise?? Or do different encoders use different multipliers?
DVD media is 4700000000 bytes which is 4.7 "marketing (k=1000) GB" but
4.38 "computer (k=1024) GB"
It's the classic "computer GB" vs "marketing GB".
Bitrates (for both audio and video) are in units of 'k = 1000'.
I've never heard of different encoders using different units so that
shouldn't be a concern.
Cheers,
Steven Schultz
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