bttv 2.6.16: wrong VBI_OFFSET?
- From: Daniel Glöckner <daniel-gl (at) gmx.net>
- Date: Thu, 4 May 2006 22:20:29 +0200
On Wed, May 03, 2006 at 08:25:06PM +0200, Edgar Toernig wrote:
> | Hmm... played around with this. It seems, the real offset is dependent
> | on hscale. Samples start earlier/later when capture window is resized.
> | Strange... Good luck you driver writers ;)
Played around as well.. You won't like the measurements I took.
I set VBI_HDELAY=0, HSCALE=0, HDELAY=11 and captured with VIDEO_PALETTE_RAW.
After each frame I increased HSCALE. The samples from 0H to start of capture
are calculated by searching for the next line's 0H.
Here is a picture: http://www.stud.uni-hannover.de/~daniel/vbi.png
The pattern looks nice, but I don't think we can compensate for that.
Daniel
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