EVS GigE

[crelf]

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@BlueCheese wrote:

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@crelfVO wrote:

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@BlueCheese wrote:

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@crelfVO wrote:

How about something like this card - would it work in an EVS?

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No, that card appears to use a Realtek chipset that I don't think is compatible with any RT drivers, let alone the GigE Vision driver needed on RT.

Eric

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Ok, so what will?

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Cards that are sold by NI for GigE Vision purposes, perhaps? 🙂

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Ok, so ignore everything I've said so far and let me ask my question in a different way: I need to build a system that has up to 11 cameras which need to acquire at around 50fps at 640 x 480 (8bit color) and save all those to disk.  What would you suggest?

[BlueCheese]

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crelf wrote: 

Ok, so ignore everything I've said so far and let me ask my question in a different way: I need to build a system that has up to 11 cameras which need to acquire at around 50fps at 640 x 480 (8bit color) and save all those to disk.  What would you suggest?

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Well, a lot depends on what you are doing with that data afterwards... Can the data be written in a lossy format? Without any compression and asusming you are writing mono images to disk and converting to color afterwards, that is already 150+MB/sec of data if you have 11 cameras. The EVS doesn't have that type of disk speed---you'd probably be looking at a 2-4 disk RAID array to maintain that reliably. This pushes you to PXIe or desktop systems most likely. With compression you might be running into CPU limits on the EVS needed to do the compression.

Eric

[crelf]

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@BlueCheese wrote:

Well, a lot depends on what you are doing with that data afterwards... Can the data be written in a lossy format? Without any compression and asusming you are writing mono images to disk and converting to color afterwards, that is already 150+MB/sec of data if you have 11 cameras. The EVS doesn't have that type of disk speed 

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ok, so what *can* it support?  Assume it can be lossy.  And no, I'm not writing mono images to disk and converting - I'm acquiring color (probably with something like an AVT Manta G-032C or similar.  Also, I'm not expecting one EVS to handle this - if I need multiple EVSs to spread the cameras across then I'm ok with that.

[BlueCheese]

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crelf wrote:

ok, so what *can* it support?  Assume it can be lossy.  And no, I'm not writing mono images to disk and converting - I'm acquiring color (probably with something like an AVT Manta G-032C or similar.  Also, I'm not expecting one EVS to handle this - if I need multiple EVSs to spread the cameras across then I'm ok with that.

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I'm not sure. The RT versions of the EVS include a flash-based solid-state drive that is 1GB in size and not exactly blazing in speed (it is designed for industrial uses). I would not suggest using it for saving images to disk. The Windows versions of the EVS has 1 laptop hard drive that is quite a bit bigger but is still not anywhere near the speed you need.

Is there any reason you are looking at RT devices in particular? They are great for real-time inspection/control, but if you just want image logging to disk I'd suggest a Windows-based desktop with a RAID array. Maybe it might be best to step back and explain more details of your entire system requirements.

Eric