Tech Insider					     Technology and Trends


	      Linux Video & DVD Project Mailing List Archives

List:       linux-video
Subject:    video capture at high res.
From:       R Krajcarski <rjkrajca () engmail ! uwaterloo ! ca>
Date:       2000-01-31 15:28:27


Hello, I'm using the Hauppauge WinTV card, to try and capture stills of
video streams.  I'm hoping to get resolutions of 768x576, or 640x480, but
I only need a frequency of say 10 FPS.  Using some existing programs (like
xcaptest.c) I'm finding that at resolutions higher then 320x240 the image
jitters significantly.  I'm wondering if this is caused by interlacing of
the signal?  If so I figure that I should be able to manually interleave
the signals resulting from the V4L2_FMT_FLAG_TOPFIELD (and ...BOTFIELD).
Anyway, I'm not having much luck so far, and I was wondering if anyone has
had success in capturing images at these resolutions.

Thanks for any help or suggestions you can offer

Rob Krajcarski


-- 
         To unsubscribe: mail video4linux-list-request@redhat.com with 
                       "unsubscribe" as the Subject.

List:       linux-video
Subject:    Re: video capture at high res.
From:       Justin Schoeman <justin () suntiger ! ee ! up ! ac ! za>
Date:       2000-01-31 15:36:36

> 
> Hello, I'm using the Hauppauge WinTV card, to try and capture stills of
> video streams.  I'm hoping to get resolutions of 768x576, or 640x480, but
> I only need a frequency of say 10 FPS.  Using some existing programs (like
> xcaptest.c) I'm finding that at resolutions higher then 320x240 the image
> jitters significantly.  I'm wondering if this is caused by interlacing of
> the signal?  If so I figure that I should be able to manually interleave
> the signals resulting from the V4L2_FMT_FLAG_TOPFIELD (and ...BOTFIELD).
> Anyway, I'm not having much luck so far, and I was wondering if anyone has
> had success in capturing images at these resolutions.
> 
> Thanks for any help or suggestions you can offer
> 
> Rob Krajcarski

I assume you are using NTSC source?  If so, it is a known problem, but I 
haven't yet found the solution.  PAL capture seems to work perfectly, but NTSC 
capture has a nasty habit of losing sync.

Unfortunately, I am very busy at the moment, and won't have time to look at it 
for quite a while yet.

-justin


-- 
         To unsubscribe: mail video4linux-list-request@redhat.com with 
                       "unsubscribe" as the Subject.

List:       linux-video
Subject:    Re: video capture at high res.
From:       Ragga Muffin <ragga () pyxis23 ! ec ! t ! kanazawa-u ! ac ! jp>
Date:       2000-01-31 15:44:33


Justin Schoeman <justin@suntiger.ee.up.ac.za> wrote:

>I assume you are using NTSC source?  If so, it is a known problem, but I 
>haven't yet found the solution.  PAL capture seems to work perfectly, but
>NTSC capture has a nasty habit of losing sync.

Could you specify if this is a problem in the V4L, V4L2 drivers or in
xcaptest ?

I'm doing capture using a bt848 at 320x240 for the moment because I still 
need to figure out the image post-processing stuff we are doing. 
But I'd like to raise the resolution later to 640x480. So please
enlighten me.

Tnx
--
Give me Debian or pencil and paper


-- 
         To unsubscribe: mail video4linux-list-request@redhat.com with 
                       "unsubscribe" as the Subject.

List:       linux-video
Subject:    Re: video capture at high res.
From:       Justin Schoeman <justin () suntiger ! ee ! up ! ac ! za>
Date:       2000-01-31 16:16:07

> 
> Justin Schoeman < justin@suntiger.ee.up.ac.za> wrote:
> 
> >I assume you are using NTSC source?  If so, it is a known problem, but I 
> >haven't yet found the solution.  PAL capture seems to work perfectly, but
> >NTSC capture has a nasty habit of losing sync.
> 
> Could you specify if this is a problem in the V4L, V4L2 drivers or in
> xcaptest ?
> 
> I'm doing capture using a bt848 at 320x240 for the moment because I still 
> need to figure out the image post-processing stuff we are doing. 
> But I'd like to raise the resolution later to 640x480. So please
> enlighten me.

This problem seems to be limmited to the v4l2 driver.

-justin


-- 
         To unsubscribe: mail video4linux-list-request@redhat.com with 
                       "unsubscribe" as the Subject.

			        About USENET

USENET (Users’ Network) was a bulletin board shared among many computer
systems around the world. USENET was a logical network, sitting on top
of several physical networks, among them UUCP, BLICN, BERKNET, X.25, and
the ARPANET. Sites on USENET included many universities, private companies
and research organizations. See USENET Archives.

		       SCO Files Lawsuit Against IBM

March 7, 2003 - The SCO Group filed legal action against IBM in the State 
Court of Utah for trade secrets misappropriation, tortious interference, 
unfair competition and breach of contract. The complaint alleges that IBM 
made concentrated efforts to improperly destroy the economic value of 
UNIX, particularly UNIX on Intel, to benefit IBM's Linux services 
business. See SCO v IBM.

The materials and information included in this website may only be used
for purposes such as criticism, review, private study, scholarship, or
research.

Electronic mail:			       WorldWideWeb:
   tech-insider@outlook.com			  http://tech-insider.org/