Re: firewire bus/card counter
Dan Dennedy <[email protected]>
| Newsgroups | gmane.comp.video.kino.devel |
|---|---|
| Message-ID | <[email protected]> |
On Tue, Jun 30, 2009 at 3:54 PM, Carl Karsten<[email protected]> wrote: > What's a good way to figure out how many dv cameras can be hooked up? > > I thought maybe it was 1 per buss, and each buss would have 1 or 2 > ports. but I just found a 3 port card: > > http://startech.com/item-specs/CB1394-3-Port-IEEE-1394-FireWire-CardBus-Adapter-with-Digital-Video-Editing-Kit.aspx > > Its chip docs say: > > "Three cable ports" > http://www.via.com.tw/en/products/peripherals/1394/vt6306l/ > > I am guessing that is 3 ports on 1 buss, correct. I have some true dual bus cards, but PCI only. Not seen PCMCIA. > so now I have no idea how many cams I can hook to it. > > Also, is there a spec that says 1 dv cam per buss, or is that some > side effect of typical implementation? No limitation in the spec. I have been able to get 2 DV at S100 working on 1394a. I have been able to get at least 4 DV analog converters that have dip switches to set S400 working on 1394a. I think it might be possible to get more on gap-optimized bus, but Stefan knows more. It is has been a long while since I looked at that math. The trick to make it work is in IEC 61883 Connection Management Procedures, which I tried to implement in libiec61883 and the dvgrab -guid option. However, I ran into difficulty with devices behaving differently - even different models from the same manufacturer. Your mileage may vary, and I am no longer in a position with multiple supporting devices to do more work on it. > I am trying to figure out how many DV devices I can hook to one > laptop. My current wizdum tells me 1 expansion card (pc-card/pci-e) > and 1 if there is an on board; so 3 is not gonna happen ever. > > I also guess I need to start looking at dv over usb, or maybe even web > cams. for a user group meeting, low image quality isn't a deal > breaker, especially if it simplifies and drops the $price. > > -- > Carl K > > ------------------------------------------------------------------------------ > _______________________________________________ > Kino-dev mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/kino-dev > -- +-DRD-+ ------------------------------------------------------------------------------