On 14-apr-2008, at 18:26, Michael Diehr wrote:
Slightly off-topic -- anyone have experience getting 2 or more DV
sources over firewire at the same time (e.g. a canopus advc 110 and
55 at the same time?) DV requires roughly 25mbps bandwidth per
stream, so in theory FW at 400mbps should be able to handle
multiple streams, but who knows? Assuming one could work around
the DV driver issue, what's a realistic # of DV streams on a
typical mac on FW400? thx!
Hi Michael,
I have this experience with two iSight cams: Both hooked up to the
firewire bus of my PowerBook G4 (10.4.11): forget it. It seems as if
they're in each others way.
Only one of them gives an image, and the "Show Device Settings..."
button in Quartz Composer is inresponsive.
However if I hook them up both to a Lacie PCMCIA to firewire cardbus
adapter it works partially.
One is in full quality and the other is kinda pixellated. What I also
notice is that the one with less quality gives a slightly higher
image than the other when connected to a billboard.
Normally I use one of them on the cardbus adapter and the other on
the laptop's own port. Then both images are of same quality and height
I get the idea there is a one DV stream device limit on a firewire bus.
They show up named iSight and iSight#2 every time regardless of how I
connect them. Compression on both is set to component video and I can
enable the highest quality checkbox in QC with no apparent change in
video quality.
Below is a partial copy-paste from the system profiler FireWire List
wich shows they're identical in respect to firmware.
The sum in activity of Windowserver and QC rev up my cpu to approx.
60% with the QC viewer window fullscreen.
So maybe giving your mac an additional firewire port via an adaptor
card can solve your problem.
Now what I'd like to know form Apple if someone is reading: Is this
the normal behaviour I'm experiencing.
You're right Michael, a DV stream should do 25mbps but apparently bus
speed not the bottleneck.
Paul
FireWire Bus:
Maximum Speed: Up to 800 Mb/sec
iSight:
Manufacturer: Apple Computer, Inc.
Model: 0x8
GUID: 0xA2700040E6F36
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Up to 400 Mb/sec
Sub-units:
iSight Unit:
Unit Software Version: 0x102
Unit Spec ID: 0xA02D
iSight Unit:
Unit Software Version: 0x10
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x11
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x12
Unit Spec ID: 0xA27
Product Revision Level: 1.0.3
iSight:
Manufacturer: Apple Computer, Inc.
Model: 0x8
GUID: 0xA27000402FB79
Maximum Speed: Up to 400 Mb/sec
Connection Speed: Up to 400 Mb/sec
Sub-units:
iSight Unit:
Unit Software Version: 0x102
Unit Spec ID: 0xA02D
iSight Unit:
Unit Software Version: 0x10
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x11
Unit Spec ID: 0xA27
iSight Unit:
Unit Software Version: 0x12
Unit Spec ID: 0xA27
Product Revision Level: 1.0.3
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