I'm using sliced. I will try raw vbi and see. Thanks, Rich
-- Rich Kadel Know'bout, Inc. (858) 433-1747 www.knowbout.com Do you know about Know'bout? -----Original Message----- From: Hans Verkuil [mailto:[EMAIL PROTECTED] Sent: Saturday, July 15, 2006 3:41 AM To: [email protected] Cc: Rich Kadel; 'User discussion about IVTV' Subject: Re: [ivtv-devel] VBI errors on NTSC Cable channels 56 and 57 - ivtv problem? 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? _______________________________________________ ivtv-devel mailing list [email protected] http://ivtvdriver.org/mailman/listinfo/ivtv-devel
