[mythtv-users] Closed captioning support

Bryan Lockwood bryan at lockwoods.us
Sat May 21 01:44:50 UTC 2005


Thanks for adding to the chart.

I am currently running the 'surprisingly stable' 0.3.4u (unstable) IVTV
release with a PVR250. IvTv seems to be translating NTSC CC data perfectly!
I ascertain this by running /usr/src/ivtv-0.3.4u/utils/vbi in an SSH session
to the backend. I get good text in the SSH session. BUT while that utility
is running, mythfrontend will not show live TV. And no matter which setup
options I've tried there seems no way to get Myth to show the CC data.

So, IvTv support of CC seems to be evolving. I just don't seem to be able to
get Myth to make use of it!


-----Original Message-----
From: Ian Trider [mailto:iantri at gmail.com] 
Sent: Friday, May 20, 2005 7:22 AM
To: bryan at lockwoods.us; Discussion about mythtv
Subject: Re: [mythtv-users] Closed captioning support

I've filled in some of the information I know.

To answer your question, there isn't really much of anything you can
do yet to get working CC in prerecorded and live programming. (get a
VCR or DVD recorder0

A bttv based card will pass out a VBI stream that MythTV can decode
during Live TV, but it is not (AFAIK) recorded by Myth.

CC support does not entirely work in IVTV -- if it did, it would be
irrelevant whether or not Myth supports it if you have a PVR-350
because if you set IVTV to include the CC data in the MPEG datastream,
and set the decoder part to pass it back out, you can enable CC on
your TV and it will come through.

However, as I said, it still doesn't quite work and you will just get
a scrambled mess.

I would say a PVR-350 is your best bet, when (if?) IVTV gets the
closed captioning issues sorted out.

Ian Trider
iantri at gmail.com

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