Really? Ive had success with two different DV devices on the same bus on an older MBP, one on the 800 port with 8 pint to 4 cable, and one on the FW 400 with a 6 pin to 4 using a Canon HV20 and an older Elura using a QTCaptureSession & QTCaptureVideoPreviewOutput.
HD is a slightly different beast, as their are a variety of standards that use FW (HDV, DVCProHD, AVCHD etc) so bandwidth is more of a trick. Even one HDV stream live is tricky (even though its still 25Mbits/s same as DV, decompression is expensive). On Dec 11, 2010, at 1:57 AM, Achim Breidenbach wrote: > Hi, > > our experience at Boinx Software is, that even small DV streams don't work in > parallel on the same firewire bus. We blame it on a poor old protocol the > video devices are using to send data via firewire. > > We usually recommend using Sonnet USB/FireWire ExpressCard|34 for MacBooks or > Startech 3+1 Internal Port PCI Express FireWire Card for MacPros to extend > the computer with a second independent firewire bus. > (Links can be found on our equipment page here > http://www.boinx.com/boinxtv/equipment/ ) > > best, > > Achim Breidenbach > Boinx Software > > > On 11.12.2010, at 01:18, Christopher Wright wrote: > >>> then connect one external live HD image via firewire camera, and one >>> external live HD image via firewire device. >>> this case only one is working. >>> >>> do you know why ? is there any solution ? >> >> This usually doesn't work because there isn't sufficient bandwidth on the FW >> bus to allow 2 HD streams. >> >> As for a solution, you'll need 2 distinct FW buses (via another card or >> something?), or smaller video streams. >> >> -- >> Christopher Wright >> [email protected] >> >> >> >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Quartzcomposer-dev mailing list ([email protected]) >> Help/Unsubscribe/Update your Subscription: >> http://lists.apple.com/mailman/options/quartzcomposer-dev/achim%40boinx.com >> >> This email sent to [email protected] > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Quartzcomposer-dev mailing list ([email protected]) > Help/Unsubscribe/Update your Subscription: > http://lists.apple.com/mailman/options/quartzcomposer-dev/doktorp%40mac.com > > This email sent to [email protected]
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