On Saturday 15 July 2006 04:59, Rich Kadel wrote:
> OK. I verified that the PVR-500 does NOT have this problem in
> Windows Media Center.
Under Windows only 'raw VBI' is used. That should work fine under Linux
too.
> When I use zvbi to extract VBI closed caption and XDS information, I
> get constant parity errors on channel 56 (NTSC broadcast), making the
> CC data unusable. (I'm not sure a single character is right). On
> channel 57, I get frequent Parity errors (about every 10 Line-21's or
> so). Channels 54, 55, 58, and 59 are very clean.
Are you using 'sliced VBI' or 'raw VBI' with zvbi? That's a very
important difference. In any case, it may be useful to look at the raw
VBI data with the osc tool included with zvbi: you can use it to check
if the VBI wave form is somehow different or noisier in the problem
channels compared to the other channels.
Hans
>
>
>
> When I look at the video on channel 56, it appears OK.
>
>
>
> I am using ivtv 0.4.6.
>
>
>
> Is this an IVTV problem? Is it a known problem?
>
>
>
> It does not appear to be a problem with the card, since the card
> works in Windows.
>
>
>
> As mentioned in the thread below, this occurs on multiple Linux
> machines, in different locations (miles apart) but with the same
> cable provider.
>
>
>
> Thanks,
>
> Rich
>
>
>
> --
>
>
>
> Rich Kadel
>
> Know'bout, Inc.
>
> (858) 433-1747
>
> www.knowbout.com
>
>
>
> Do you know about Know'bout?
>
>
>
> _____
>
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Rich Kadel
> Sent: Friday, July 07, 2006 6:19 PM
> To: 'User discussion about IVTV'; [email protected]
> Subject: [ivtv-devel] Problems with PVR-x/IVTV and VBI data on
> certainchannels
>
>
>
> Does anyone know why I get parity errors when trying to extract VBI
> data (e.g., closed captioning) on certain channels?
>
>
>
> For comparison, on a Windows PC, using a Conexant Falcon-II based
> card that appears to come from ASUSTEK (it was bundled in the Windows
> Media Center HP Pavilliion I got), the closed caption comes through
> Media Center "loud and clear".
>
>
>
> However, on Linux (Centos 4.3), using IVTV and the ZVBI library, I
> have not been able to read VBI on Channels 56 and 57. 55 works fine,
> as do many other channels. I have not tested exhaustively, but I
> think 70 worked fine too, so it doesn't appear to stop at the
> frequency for 55.
>
>
>
> I am seeing this problem with PVR-150, PVR-250, and PVR-500 cards, in
> two different physical locations (miles apart), but using the same
> Time Warner cable provider (San Diego). It is consistent. No luck
> with those channels over the last 4 days.
>
>
>
> Is it the IVTV driver or the Hauppauge cards? I bought them all in
> the last 2 months, and there are a variety of tuners (TCL, Phillips,
> Samsung, and LG) on these cards. I believe I've tested with all of
> those varieties. The Tuner appears NOT to be the variable. The
> picture seems to be fine as well, using the Hauppauge cards.
>
>
>
> I have not yet tried one of the Hauppauge cards in Windows Media
> Center, so yes I will do that next and let you know.
>
>
>
> Thanks,
>
> Rich
>
>
>
> --
>
>
>
> Rich Kadel
>
> Know'bout, Inc.
>
> (858) 433-1747
>
> www.knowbout.com
>
>
>
> Do you know about Know'bout?
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