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DonaemouS
Member
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Posted: Thu Jun 22nd, 2006 04:51 pm |
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Hi, does it work as uncompressed image data stream? Or just relay to DV compressed video format?
My question is just because i can't use 2 DV device at the same time on a PowerMac G5 and i need to connect to my PowerMac 2 video quad processors.
thanks,
Luciano
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Gary
Administrator
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Posted: Thu Jun 22nd, 2006 08:37 pm |
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DonaemouS wrote:
Hi, does it work as uncompressed image data stream? Or just relay to DV compressed video format?
The ProView USB (and now the XtraView USB) both are native uncompressed YUV 4:2:2. The issue capturing uncompressed though, is writing it to the drive. You will need a very fast drive, or raid array to keep up with the device. We normally recommend photo jpeg, wth the 'better' setting for fast and smaller file sizes with minimal loss.
DV format uses a compression that has both interframe and interfield compression. The advantage of using Photo jpeg is that you won't have the extra loss associated with the interfield compression of DV.
Last edited on Sun Oct 29th, 2006 09:55 am by Gary
____________________
Gary Dailey
Daystar Technology
http://Daystar-Tech.com, http://Daystar-Store.com
email: gary@daystartechnology.com, chat: garydailey@mac.com
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DonaemouS
Member
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Posted: Thu Jun 22nd, 2006 09:17 pm |
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this mean that i can't add to my external DV device to add a new concurrent video input?
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Gary
Administrator
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Posted: Fri Jun 23rd, 2006 02:27 am |
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DonaemouS wrote:
this mean that i can't add to my external DV device to add a new concurrent video input?
Actually you can add the DV device as well. The multiple / bandwidth issue is simply on the USB bus.
We have also expanded the Mac USB Video Capture line... Which fully supports multiple devices as well!
InterView USB Video Capture
(USB 1.1, 1/4 Screen with seperate cable/input for audio)
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=61
ProView USB Video Capture
(USB 2.0, Full Screen with seperate cable/input for audio)
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=656
XtraView USB Video Capture
(USB 2.0, Full Screen all-in-one capture a/v capture device)
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=700
 Last edited on Sun Oct 29th, 2006 09:40 am by Gary
____________________
Gary Dailey
Daystar Technology
http://Daystar-Tech.com, http://Daystar-Store.com
email: gary@daystartechnology.com, chat: garydailey@mac.com
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Gary
Administrator
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Posted: Sun Oct 29th, 2006 09:59 am |
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DonaemouS wrote:
My question is just because i can't use 2 DV device at the same time on a PowerMac G5 ...
Both the ProView USB and XtraView USB support multiple devices. But.. there is a bandwidth problem. A single device can use up to 90% of USB 2.0's available bandwidth. Considering that... and the fact that macs only have one USB 2.0 controller on the logic board, you are limited to a single device.
You can add Mac compatible USB 2.0 cards and add a ProView USB or XtraView usb device per card.
If you are considering webcam, security or surveillance situations though... I strongly suggest using the InterView 3 devices. The InterView USB capture devices have exclusive hardware compression technology built in, which reduces the bandwidth requirements to a trickle... allowing you to connect up to 7 devices to a single Mac without any additional hardware requirements.
See XLR8 Interview 3.1 Video Capture for the Mac:
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=61
See XLR8 ProView USB Video Capture for the Mac:
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=656
See XLR8 XtraView USB Video Capture for the Mac:
http://daystar-store.com/index.asp?PageAction=VIEWPROD&ProdID=700
____________________
Gary Dailey
Daystar Technology
http://Daystar-Tech.com, http://Daystar-Store.com
email: gary@daystartechnology.com, chat: garydailey@mac.com
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