Problems with Hauppauge USB-Live2 black border?

mbassiouny · #1 06-15-2021, 03:42 PM

Hi,

I am using a Hauppauge usb-live 2 and I ran into 2 issues:

- Audio clipping, I saw some posts here about it too, and managed to find a workaround to turn the volume down

- Black orders on the right side when capturing NTSC source and I am not able to find a solution for this issue yet...

Does anyone have a solution for this?

lollo2 · #2 06-15-2021, 04:37 PM

Quote:

Black orders on the right side when capturing NTSC source and I am not able to find a solution for this issue yet...

What issue are you talking about? The active pixels are 702 (max); if you capture at 720x you will have at least 18 pixel black borders.
http://www.arachnotron.nl/videocap/d..._cap_v1_en.pdf

Hauppauge USB-Live 2 distributes the black pixels more in the right than in the left.
If you wish to center the image you can use crop() and addborders() in avisynth.

mbassiouny · #3 06-15-2021, 05:04 PM

Yes, I was talking about these 18 pixels on the right, I usually crop them with avisynth but why for example when I capture with advc-100 I only get 12 pixels of black borders not 18 (6 on the right and 6 on the left)?

lollo2 · #4 06-15-2021, 05:23 PM

I do not know, I do not have an advc-100. However, the active pixels should be <=702. If advc-100 captures at 720-12=708, something is not clear to me.

mbassiouny · #5 06-15-2021, 07:23 PM

hmm,

I checked the document you sent and read more. if I understand correctly and we can not get >702 due to the so called "administrative overhead" (/Nominal blanking) then maybe it means the ADVC (and any card that shows full 720) is doing some (hardware) scaling before sending to the PC.

On the other side, the Hauppauge card does not do any HW upscaling.

Can someone confirm this theory?

lordsmurf · #6 06-16-2021, 04:55 AM

The active image is not 720, so having null ("black") pixels is what happens. You cannot change this.

The Canopus DV boxes do all kinds of things to image, none of it good. A simple way to show only active pixels is distort aspect ratio. And 20 years ago, when Canopus boxes were sold, that's often what happen. Not stretching the image was yet another benefit of ATI AIW cards, at the time, as it respected AR. And the capture chipset/area was about 712 pixels, with true pad to 720. Better was to capture 704, as most of the 704>712 was noise or black non-active data.

I don't think scaling is an option, as that would involve messing with interlace.

Understanding all of this is mostly trivia, and has no real-world application to the actual capturing. Everybody should realize (eventually, at least) that a videotape has "bad"/noisy edges, and it needs to be masked (NOT CROPPED!). Color bars, black, head-switching, etc. Capture, mask, and done.