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[mpeg2] Re: docs
On Mon, Oct 01, 2001 at 02:11:10PM -0600, Warren Young wrote:
> I would be most impressed if you pulled that off. :) MPEG is not
> simple, even at the limited level you're talking about.
Heh. Well, I meant write done the file format.
> If the GOP isn't closed, the final B frame depends on the I frame
> leading the next GOP. If the encoder supports non-closed GOPs, you can
> often ask it to close some or all of the GOPs. This either makes the B
> frame use forward prediction only (making it like a P frame) or makes
> the encoder replace the last B frame in the GOP with a P frame. Failing
> that, you could probably keep the subsequent I frame, as you originally
> suggested.
Okay, cool. I'll probably do the I-frame pair thing, then. This is all
just to trim down the size of MPEG2's from the kfir before I DivX them.
> Most people who are building MPEG software find a way to make some money
> at it, so spending a few hundred bucks on documents is no big thing.
> It's really not much different from buying O'Reilly or FSF books, to
> help support the community. Sure, these ISO standards are a _tad_ more
> expensive <grimmace> but they're also absolutely authoritative. They
> took many person-years to hammer out, and the market for them is small.
> I think the prices are justified.
Agreed. If I was making money off this, I wouldn't hesitate to buy the
ISO docs. In fact, if I was writing an encoder or a decoder, I might just
do it too, but I just thought it would be silly to pay that money to chop
up existing files. :)
--
Kees Cook @outflux.net
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