Forum

Capture card

#1

For an installation video I’d like to send a stream video of 2048 * 2048 , computer (VJ Software appoints) to another PC (vvvv), which capture card do you recommend for a resolution with a minimum of 30 fps?..

I find this model what do you think ? what are compatible with vvvv ?

Black magic DeckLink 4K : http://www.blackmagic-design.com/products/decklink4k/
3840x2160 29.97fps

#2

I use a Black Magic Intensity Pro which captures 1080 uncompressed or compressed at 30p or 60i via HDMI or component. It works fine under vvvv, and also gives you other input options (composite and s-video which I use for IR cams). If that res is OK for you, it’s cheaper. I think all the Black Magic devices use the decklink driver, so the 4K should work OK.

Just a heads-up though, I’ve had trouble sending some captured video into SharedMemory nodes. Some devices that capture fine into vvvv just won’t work at all or have scrambled images (changing the bytes per pixel doesn’t help). But couldn’t imagine using shared memory for 4K video, I’ve done 1080p and only got about 15FPS on a fast machine. Good luck!

#3

Thx for your support, I need a resolution of 2048*2048 minimum.

I agree with if blackmagic intensity is ok , I think decklink is ok.

Now I must find a graphics card wich allow a résolution of 2048*2048 … ( for sending video stream) …

#4

I do not think, the DeckLink 4K is the way to go.

Every input of the DeckLink 4K only is capable to work with 3G/HDSDI. This normaly only is 1920x1080p50 or similar. 4k i think only is possible by combining all four inputs of the card. … i do not think you will find any practical and affordable way to output this kind of signal / combination of signals from a single graphics card.

The better way might be the new DVI DualLink grabber card from datapath http://www.datapath.co.uk/products/video-capture-cards/visiondvi-dl. For DVI DualLink 2048x2048 (for example at 60Hz) is no problem at all and every graphics card is able to output resolutions with this bandwidth. The biggest task might be to force the graphics card with a custom EDID to output this non standard resolution of 2048x2048@xxHz.

I have the Datapath Vision DVIDL sitting here on my desk alread but did not find any time to test it within vvvv yet. I will post my findings as soon as possible.

Best

Markus

#5

“The biggest task might be to force the graphics card with a custom EDID to output this non standard resolution of 2048x2048@xxHz.” It looks difficult on windows, more easy on linux ( more information on linux … ) , I ask for this to one of my friend.

I think avoid the problem by sending a resolution of 2560 * 1600 with a display port, what do you think for fps of the acquisition with this resolution (almost the same number of pixels).

Thanks for your advise ;) for DVIDL and custom EDID, I’m impatient to read your result.

#6

from documentation of DVIDL : Flexible support of video modes including “Quad HD” 3840 x 2160 at 24/25/30 fps, 2560 x 1600 at 60 fps.

Great ! this is a solution if this card works with vvvv !

#7

normaly if this card accept directshow , it’s ok with vvvv ? no ?

#8

I’ve used datapath single link dvi capture cards very successfully. the drivers are much better and much more stable than the blackmagic drivers. It’s literally plug and play.
I assume that this card works well with vvvv.

It says: “Any application compatible with Windows® DirectShow technology can use the VisionDVI-DL due to its built-in WDM support.”

#9

great news ;) thx Eno .

#10

did some first tests with the datapath vision DVIDL

  • as expected the card/driver works plug and play without any problems in vvvv
  • nice thing is that the EDID of the card can be configured, with the datapath configuration tool. So it is no problem at all to force the input computer to for example 2048x2048@50Hz.
  • capturing and displaying this resolution works in a straight “videoin-texture-quad-renderer - patch” on stable full 50fps … no visible stuttering (50Hz is maxmax … 60hz only runs at apprx. 50Hz)(i7-2600/win7)
  • the only bad thing is, that there is some kind color reduction. In the grabbed image you can see some bending that is not visible in the original image.!?

Markus

#11

thx MSBERGER , i buy it in few weeks ;)

#12

fortunately i can correct my post dated 08/10/2011

The color reduction / bending was not caused by the datapath vision DVIDL but by another component in the signal chain.

@diez:
there are still some mainboard incomatibilities datapath is fighting with with this brand new card. I am in close contact with datapath about this. Feel free to contact me before putting together a system.

Markus

#13

Markus,see whether they fancy making a dedicated plugin/ driver for the card, having played with resolume4 and a blackmagic card, with only a couple of frames latency, it makes a big difference, imagine vvvv as a spyder replacement, it would probably swing a sale or 2 to me let alone everyone else!

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