Quoting [email protected]:
Hi,
does anyone already has experienced this problem? On the recorded
video of the vga2usb device we see every recording shifted to the
right by some 50 pixels or so (so the left border is filled up with
black color).
We use Ubuntu 10.10 and MH 1.2; the Epiphan homepage says something
about that problem, but where do I fix this on Ubuntu?
Any input appreciated, regards, Andreas
Hi!
I had the same problem, and spent last weekend finding a cure for it.
I documented this in the opencast wiki, but it's still in my private
space, as I didn't know where to put it etc...
Here's a few lines that will get you the v2u -utility from the Epihan
SDK compiled.
I used Ubuntu 10.4.3, as it's an LTS edition.
(We want Matterhorn to be long-time, right?)
----%<--%<--%<-----
wget http://www.epiphan.com/products/epiphan_sdk-3.26.1.0021.zip
unzip epiphan_sdk-3.26.1.0021.zip
cd epiphan_sdk-3.26.1.0021
cd epiphan/samples/v2u
sudo aptitude install libusb-dev zlib1g-dev
make
sudo chmod 777 /dev/vga2usb*
cd build/release/
./v2u --list
----%<--%<--%<-----
You should get something like: v2u: 1 frame grabber detected: D4U24888
Now that you have v2u installed, you can change all the timings (try
changing a vga-mode line, it takes some time to get them right, or you
can cheat and connect a windows laptop and check the timings from it's
debug info, like so: http://mok.fi/mok/VGA-mode-Win7.jpg and just copy
them to the linux init scripts. The settings are cleared every time
you reload the kernel module).
I was lazy and just copied the v2u file to /usr/local/bin.
Also very useful is the -a gain=100 (or so) line, as we had problem
with the VGA capture being always washed-out, or underexposed.
Remember to include the "sudo chmod 777 /dev/vga2usb*" -line to
/opt/matterhorn/capture_agent/epiphan_driver/Makefile, otherwise your
normal matterhorn user won't be able to access the device.
v2u can also grab a quick .jpg from the source that helps in debugging
issues (mount some directory from the Capture Agent to your desktop
via SSHFS, and start testing).
You should also have a look at "modinfo vga2usb.ko" as there are a few
options that also affect this behaviour.
Hope this helps!
Any additional tips and comments are very welcome!
Tero K.
Network Systems Administrator (padawan)
University of Helsinki, IT Dept, AV services.
-------
Tero Kärkkäinen
[email protected]
+358-50-5822365
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