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jaialai  
#1 Posted : Monday, March 12, 2018 6:15:16 AM(UTC)
jaialai

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I looking for a box with 4 SDI inputs to go to the laptop by USB 3.0. I can't see nothing about this.

If that item exists could i see (preview) the all cameras in VMIX?

Thanks
zenvideo  
#2 Posted : Monday, March 12, 2018 6:48:17 AM(UTC)
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jaialai wrote:
I looking for a box with 4 SDI inputs to go to the laptop by USB 3.0. I can't see nothing about this.
If that item exists could i see (preview) the all cameras in VMIX?

Unless you were working at SD resolution, USB3 doesn't have enough bandwidth for four uncompressed video signals, which I guess is why no-one makes such a device in an age where HD is the expected norm. Technically, a device could be made which uses lossy hardware compression to reduce the data-rate sufficiently to handle four streams of HD over USB3, but if using (uncompressed) SDI sources, why would people want to lower the quality by using such a method? It is better to use a Thunderbolt connection to an external PCIe expansion chassis fitted with a quad SDI capture card from the likes of AJA, Blackmagic, Magewell or Yuan.
thanks 2 users thanked zenvideo for this useful post.
sinc747 on 3/15/2018(UTC), mjgraves on 3/15/2018(UTC)
jaialai  
#3 Posted : Monday, March 12, 2018 6:53:53 PM(UTC)
jaialai

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Thanks for your reply. Yes i use hd video.
mjgraves  
#4 Posted : Thursday, March 15, 2018 10:14:32 AM(UTC)
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zenvideo wrote:
It is better to use a Thunderbolt connection to an external PCIe expansion chassis fitted with a quad SDI capture card from the likes of AJA, Blackmagic, Magewell or Yuan.


Agreed! Could you recommend a Thunderbolt 3 PCIe card?
David_in_Philly  
#5 Posted : Wednesday, April 11, 2018 4:38:39 PM(UTC)
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I use two cards successfully - in a Thunderbolt enclosure that attaches to my laptop Asus ROGvia Thunderbolt/USB-C connector.

SDI Card: AJA Corvid 88 with 8 inputs - I can get 6 of these inputs to work simultaneiously without dropping frames
https://www.bhphotovideo...ard_8_lane_pcie_2_0.html

HDMI Card: Yuan 4K card with 4 4K inputs - I can get 4K working in all 4 ipnuts
https://www.amazon.com/g...09_s00?ie=UTF8&psc=1

PCIe card Thuderbolt enclosure (holds 3 PCIe cards): Sonnet Echo Express:
https://www.bhphotovideo..._se_iii_thunderbolt.html
(Yuan card needs to be in top (1st) slot, AJA card below)
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