Black Line On Left Side of Capture

[cliffo]

Hi all,

Whenever I capture from the TV I get a black line down the left side of the cap as shown in this example:



I have to crop out the black line after it has been captured but was wondering if anyone knows how to get rid of it before it is captured. I use AVI_IO to capture but have used VirtualDub and by using the BT Tweaker I can move the image to the left which removes the black line before i make a capture. Is there a way to make this a permanent change in the driver (using the BTWincap drivers) so that the black line is gone in all capture programs??

Thanks in advance people

cliffo

[Craig Tucker]

This is normal, in vdub you can set to crop during capture, which saves having to do it after.

[klined4lyf]

Hi all,

Whenever I capture from the TV I get a black line down the left side of the cap as shown in this example:

---

I have to crop out the black line after it has been captured but was wondering if anyone knows how to get rid of it before it is captured. I use AVI_IO to capture but have used VirtualDub and by using the BT Tweaker I can move the image to the left which removes the black line before i make a capture. Is there a way to make this a permanent change in the driver (using the BTWincap drivers) so that the black line is gone in all capture programs??

Thanks in advance people

cliffo

I use a Hauppauge WinTV GO PCI and I experience the same problem when using non Hauppauge drivers. I wrote an email to the btwincap guys, so see the explanation below:

*****
Hello:

First off, let me say that you do a great job with these drivers and I along with people in some online vidcap discussion forums do really appreciate the work done for BT cap cards. However, I have been experiencing a problem. I seem to get a black vertical bar along the left side of my tuner screen. It seems to me to be as if the entire capture area has been pushed to the right. This bar is present on all channels, although in varying widths, even when capturing from the composite in.
I don't have this problem with the Hauppauge drivers, but they do not allow me to access some of the chip features that your drivers do. I'd like to know if this is a typical issue of my card and also if it is possible for a future driver to correct the screen. To clarify, no Hauppauge drivers I've used to date cause the vertical bar to appear, however, I do get the bar with the btwincap drivers as well as with Linux bttv drivers ( kernel 2.4.18 ). So, I'm fairly sure it has more to do with my card.

System: Hauppauge WinTV GO PCI
Windows 2000 SP3
AMD 750 Duron
384MB RAM
btwincap 5.3.6-1 (although I have experienced the same problem with 5.3.5)


His Reply:

No, it's a bar caused by the way the bt8x8 captures video... Just to keep it
short, the bt8x8 can be programmed to capture any portion of the video
frame.. Btwincap was designed to capture the entire frame, but most video
sources do not provide this entire frame, just a part of it. Usually noone
notices that because TV sets do not show all the video frame, they simply
discard a "border" around the video image... This (border) is called
sometimes overscan, but it is not... YHauppauge simply also programs the
bt8x8 to crop the image and does not let the user see this "extended" image
... If you want to exactly know what i am saying, install Hauppauge Drivers,
capture a known video frame, the install btwincap drivers and capture the
same frame... You'll see...

The driver could be "adjusted" to skip this piece of video, but i don't
want to do that, because high quality video will provide that part of the
image... You can always crop the captured image to get the part you want.
You can also do that in realtime using AmCap, that simply tells btwincap to
skip that portion of the image if the user chooses so.


*****

Hope this helps,

K

[cliffo]

Thanks K,

appreciate the info. I guess in a way its good that it captures the entire image. Cropping isn't that big a deal in the grand scheme of things.

cheers,

cliffo