[AG-L] Use of Epiphan VGA2USB with Access Grid
david at davidjb.com
Wed Apr 4 03:13:00 UTC 2012
Thanks for the info. The output from vic.exe -Q is effectively nothing:
<?xml version="1.0" encoding="UTF-8" ?>
which is somewhat strange as there is 1 camera (USB) plus the VGA2USB
device connected to this XP computer. Vic knows about the devices if I run
"vic.exe localhost/5000", but cannot open the VGA2USB for capture (the
other camera works fine).
Connecting the VGA2USB to my Linux (Ubuntu 11.10) machine and running the
same reveals thus: http://pastebin.com/H8DZ5VTN . Trying to run vic as
above sees the other camera I'm using work fine, but VGA2USB unable to be
opened as well.
As for supporting the I420 pixelformat, I'm not 100% sure where I should be
looking. The DirectShow properties window lists UYVY, RGB24, YUY2, RGB565
and RGB8 as 'Color Space/Compression' options and judging by the fact the
another of my cameras on another machine lists I420 in its list, presumably
this is where it should/would be. Seemingly this device does not support
I420 and doesn't advertise that it does. VLC, however, is able to open the
device under Windows successfully against each of those options. For what
it's worth, the built-in camera in this computer supports YUY2 only and Vic
is able to work with that without issue.
Any other thoughts or is this simply not workable?
On Mon, Mar 12, 2012 at 12:04 PM, Douglas Kosovic <doug at uq.edu.au> wrote:
> Hi David,
> The node service configuration doesn't do any detection for supported
> resolutions, it only parses the output returned by 'vic -Q' which does the
> actual querying of the capture devices.
> Could you try running:
> vic.exe -Q > devices.txt
> where vic.exe is somewhere under C:\Users\*\AppData\ for the current user
> (you have to pipe to a file as stdout won't be echoed to the console).
> I'm not sure if arbitrary resolutions for the large capture size would be
> able to be set in VIC, only what's offered in the VIC GUI (which is the
> same as the output of vic -Q).
> Could you confirm the Epiphan VGA2USB works with the I420 pixel format?
> Probably the simplest way to test is with VLC which also uses DirectShow
> and I420 pixelformat. I've had some devices that advertise thru the
> DirectShow API that they support I420, but crash in both VLC and VIC when
> in fact they don't support I420.
> Some devices also don't enumerate all their capture resolutions with the
> IAMStreamConfig::GetStreamCaps method, which causes headaches and
> fortunately is only a minority of devices.
> -----Original Message-----
> From: accessgrid-l-bounces at lists.aarnet.edu.au [mailto:
> accessgrid-l-bounces at lists.aarnet.edu.au] On Behalf Of David Beitey
> Sent: Monday, 12 March 2012 10:41 AM
> To: accessgrid-l at lists.aarnet.edu.au
> Subject: [AG-L] Use of Epiphan VGA2USB with Access Grid
> Hi all,
> I've recently opened an Epiphan VGA2USB device and want to utilise this
> with the Access Grid software (on Win XP). I've installed the device and
> everything works fine under every application, except within Vic in AG.
> When the capture size is specified as 'Large' in the AG node service
> configuration, the moment that Vic tries to open the capture device, Vic
> crashes. I'm able to get the device to capture and work on 'Small' or
> "Medium" sizes, but the video is garbled.
> I suspect the issue is with Vic / the node service configuration pages
> detecting the capture resolution as 2048x2048 (the maximum the device
> supports), but I'm unable to select any other resolution. I've tried
> manually changing the node configuration file and setting the resolution to
> 1024x768, but in doing this, the video producer service no longer appears
> in the service listing.
> Any thoughts? I found a reference to (seemingly) the same device in use
> at UTS, but I'm more curious on a general level as the WDM capture works
> fine in every other application I've tried so far, except Vic.
> David Beitey
> eResearch Centre
> James Cook University
> accessgrid-l mailing list
> accessgrid-l at lists.aarnet.edu.au
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