> Oh, we've discussed streaming performance plenty here over the years.
Well at least not much since I'm on the list (which is only a few months).
> The critical issue in QuickTime is to use a codec that has a native
> packetizer, so it can do some kind of loss recovery with dropped packets.
> I've got a whole thing about it in my book.
You do write about error resilience but your book's focus is "mostly" on how
to achieve good compression with different technologies (great book btw).
You write very little about how the quality of MPEG-4/RealVideo/WMV streams
behave when packets are lost during transmission. You don't really compare
those technologies in this field (Did I say that I love pictures?;-) or run
scientific tests.
There is a lot of information about the MPEG-4 error resilience tools (on
the web, in publications etc.) but what about Real Video or Windows Media?
There is so litte information about those two.
So I was wondering if anyone has conducted some tests on how they actually
behave in lossy networks. What happens to a Windows Media Video if packets
are lost for example? Is the complete picture influenced or only parts of
it?
In your book you also mention the high CPU requirements of current RealVideo
codecs but you write little about how a real video stream reacts to such
environments. You mention frame dropping but can the RealVideo decoder also
adjust the resolution to such an environment (I'm not talking about dynamic
adoption to bandwidth here which you do cover in your book)? Does Real offer
something like MPEG-4's base layer/enhancement layer system? Or can I just
assume that if it's not in the book it doesn't support it? :-)
Oh, seems like I got carried away. Originally I only wanted to know about
how those technologies behave in real-world environments and not only
theoretically.
As I said, I don't think people talked a lot about those topics on this list
(probably because this isn't a Real or MS list - I know that - and probably
because you can put those topics in a couple of sentences as far as QT is
concerned exactly like you just did. The whole thing wasn't meant as
critisism)
Gru_
Marc
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