Re: Default ChannelLayout's
Re: Default ChannelLayout's
- Subject: Re: Default ChannelLayout's
- From: Brad Ford <email@hidden>
- Date: Fri, 3 Jun 2005 11:22:23 -0700
On Jun 3, 2005, at 6:57 AM, B.J. Buchalter wrote:
<SNIP>
IMHO, if there is no ChannelLayout defined when you query it, you
should
assume that the device should be treated as stereo, with the L and R
channels on output channels 1 and 2. This is what QT did up until
QT7 and we
never had any support questions about it (if people wanted to
listen in
surround, they went and set the Channel Layout).
At QT7, the behavior seems to have changed, and QT7 seems to make some
assumptions about the channel layout based upon the number of
available
channels, if the AMS channel layout has not been set. This has
caused a
number of customers to call for support, because QT was playing
mono signals
out Channel 3 (the assumed center channel).
(I'm cross-posting this response to the QuickTime-API list as well...)
B.J. is correct. This was a bug. I'm happy to announce that it was
fixed, though, in our recent QT 7.0.1 update (go get it via software
update if you haven't yet). We now treat unconfigured devices as
stereo.
-Brad Ford
QuickTime Engineering
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