Your session setup and configuration looks good. In order to find
muxed devices, you do need to search for QTCaptureDevices with
QTMediaTypeMuxed in addition to QTMediaTypeVideo, but based on your
previous email, it sounds like you may have already experimented with
that and run into problems. Just be sure, to search for both kinds of
devices, you would use code that looks like this:
BOOL success;
NSError *err;
dev = [QTCaptureDevice defaultInputDeviceWithMediaType:
QTMediaTypeVideo];
success = [dev open:&err];
if (!success) {
dev = [QTCaptureDevice defaultInputDeviceWithMediaType:
QTMediaTypeMuxed];
success = [dev open:&err];
}
If that approach doesn't work, there may be a problem specific to the
device being used. For example, it may be an HDV camera on a system
that does not have the HDV codec (which is only bundled as a part of
Final Cut Pro). Without the codec, the captured video cannot be
decompressed which would result in the noCodecErr that you are seeing.
David Underwood
QuickTime Engineering
On Jun 3, 2008, at 4:21 PM, Christopher Wright wrote:
Hypothetically, it shouldn't be necessary to disable the audio
connection when there are no capture outputs expecting audio, The
capture session should know to just ignore the extra stream in that
case.
hmm... I guess that won't do much then :)
In the mean time, feel free to file a bug on this issue. Details on
the specific device being used (if you can get them), your
configuration of the capture session, and your configuration of the
decompressed video output, including any pixel buffer attributes
that you might be setting, would be especially helpful.
I don't think it's a bug, as much as it is my incompetence with QT.
The camera works fine with existing software, so it must be doing
something that I'm not.
I'm not configuring the decompressed video, nor am I setting any
pixelbuffer attributes -- I just need the CVImageBufferRef to pass
along to some other image processing stuff.
My code looks something like this (error handling removed for brevity:
// get the list of owned connections
NSArray *ownedConnections = [deviceInput connections];
// disable all the audio connections
for (QTCaptureConnection *connection in ownedConnections) {
if ( [[connection mediaType] isEqualToString:
QTMediaTypeSound] ) {
[connection setEnabled:NO];
}
}
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