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RE: steadly increasing buffer

At 11:55 AM -0800 11/27/05, Charles Wiltgen wrote: 
 > Wouldn't it be better being able to limit the buffer to about 10 seconds?

A QuickTime engineer may have a better answer, but I assume this is done for
quality-of-service purposes.  PC memory is (relatively) cheap and plentiful,
and a large buffer can hide most internet traffic hiccups.

You may not be thinking far enough back in time, but you're basically right. With QuickTime 2.0 came the Data Pipe (tm). The way that works is that frames are loaded into memory ahead of where you are playing, and remain loaded behind where you have played, and when the end of memory is reached it loops around. By doing this the playback can be at the data rate of the system, and isn't affected by brief changes.

What I think you're seeing is the frames left in memory from the previously viewed video. If you happen to jump back a bit in the movie you would do so very quickly, as the frames are still in memory. That memory though is marked as purgeable, and if it's needed by anything else it can be freed up by the system.
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 >RE: steadly increasing buffer (From: "Charles Wiltgen" <email@hidden>)



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