Further tests indicate that the data for a capture (I am using mmap) is
incomplete and confused by the remains in the buffer of the previous image.
The incompleteness has a pattern which results in the grid I explained - but
the image I get is a mixture of the latest and earlier images.
If I have not waited correctly for sync or am reading the wrong buffer
(effectively the same!) would I get an effect like this?
BTW the image I see is undistorted so I am sure the RGB format is correct -
it's just got bits missing in a near-regular pattern.
Ivor
----- Original Message -----
From: "Benedict Bridgwater" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Wednesday, April 18, 2001 2:46 PM
Subject: Re: [V4L] weird effects
> Ivor, do you have any other way of testing RGB24 capture locally? Maybe
> you could run X in 24bpp and use the test program? If the "RGB24"
> rendering is known good it could still be a mismatch between the
> capturing and rendering ends in terms of little/bid-endianness or line
> padding or RGB byte ordering or 24/32bpp representation of RGB24...
>
> Ben
>
> Ivor Cox wrote:
> >
> > Hi Ben, thanks for the reply.
> > The rendering was on another machine (via network) and is reliable -
i.e.
> > RGB24 from other capture sources ans OS's show ok - so I am assuming the
> > patterns are in the raw data.
> >
> > Cheers
> >
> > Ivor
> >
> > ----- Original Message -----
> > From: "Ben Bridgwater" <[EMAIL PROTECTED]>
> > To: <[EMAIL PROTECTED]>
> > Sent: Wednesday, April 18, 2001 3:21 AM
> > Subject: Re: [V4L] weird effects
> >
> > > Ivor Cox wrote:
> > >
> > > > Hi,I am porting a video capture app to linux and have had good
success
> > > > so far except ... I am capturing using a miro PCTV card and on
redhat
> > > > linux k2.2.16. The capture mode is set to PAL and BGR24. I get a
> > > > picure consistent with that - dimensions and colour, but there are
> > > > regular vertical and horizontal lines obscuting the image in all
three
> > > > components (RGB). Is it possible this mode is not fully supported?
Dos
> > > > anyone recognize this effect? A simple demo program downloaded and
> > > > compiled runs ok but it captures in a format which matches the
display
> > > > - my app is not constrained like that and uses RGB24. Hope you can
> > > > help Ivor Cox
> > >
> > > It sounds like your conversion from RGB24 to the display format may be
> > > wrong - lots of colorful effects are possible!
> > >
> > > Ben
> > >
> > >
> > >
> > >
> > > _______________________________________________
> > > Video4linux-list mailing list
> > > [EMAIL PROTECTED]
> > > https://listman.redhat.com/mailman/listinfo/video4linux-list
> >
> > _______________________________________________
> > Video4linux-list mailing list
> > [EMAIL PROTECTED]
> > https://listman.redhat.com/mailman/listinfo/video4linux-list
>
>
>
> _______________________________________________
> Video4linux-list mailing list
> [EMAIL PROTECTED]
> https://listman.redhat.com/mailman/listinfo/video4linux-list
_______________________________________________
Video4linux-list mailing list
[EMAIL PROTECTED]
https://listman.redhat.com/mailman/listinfo/video4linux-list
