Re: Captions/BTTV | |
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Michael Jackson wrote:
My apologies on the HTML formatted post earlier. Here's a readable one.
________________________________
From: video4linux-list-bounces@xxxxxxxxxx
[mailto:video4linux-list-bounces@xxxxxxxxxx] On Behalf Of Michael Jackson
Sent: Monday, January 31, 2005 6:24 PM
To: 'Linux and Kernel Video'
Subject: Captions/BTTV
Hello, all. I'm back. :)
Here's an interesting issue.
My newest pet project is dealing with closed caption data.
I'm playing around with a bunch of avermedia PCI 350's that seem to
work well for our purposes.
I'm messing with ntsc-cc to pull captions right now, called as
"ntsc-cc -c"
What's interesting is that ntsc-cc will pull captions perfectly as
long as XawTV is running. As soon as I quit, the captions become "mangled,"
for lack of a better word - They become very nonsensical.
Example output:
BUILERE FAST.
UI
LA ARLYCENY
ONERLI
NTEQTY
ADT TR99
'SCE
HENT
This is on kernel 2.6.10... Using bttv, autodetecting the card.
Again, video and sound work beautifully (as long as I go from the audio out
to the line in)
I'm just wondering what sort of initialization/uninitialization is
happening here that makes the captions switch from "working" to "garbled."
I'm also surprised by the garbled stuff -- I thought closed captioning was located in the 'virtual blanking interval', so why is anything available at all if the picture isn't being received?
BTW I'm doing robust and reliable ntsc-cc -cp >> $DIR/$FIL.txt & capturing while mencoder is running to a cron job -- works great.
Dave
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