This is something wrong with the firmware I believe, when we go into
ff/rw mode seems to re-init the VBI decoder, so we probably need to
re-setup that when coming out of ff/rw. I hopefully can get around to
that here sooner or later and put some code in to fix that, have been
thinking about that as being a problem but haven't had time to focus on it.
Thanks,
Chris
Daniel Segel wrote:
Hi - I'm not Graeme, but I'm having a similar problem with CC data -
it works fine if I start watching a recorded show from the beginning,
but the moment I skip around it stops.
This is with:
MythTV 0.18.1-r2 (Gentoo)
NTSC
I set the following ivtv options at boot (fairly late in the boot
process):
/usr/local/bin/ivtvctl -x 1 -w cc -b cc
Thanks,
Daniel
Hans Verkuil wrote:
(Sourceforge seems to have eaten this mail, so I'm mailing it again)
Hi Graeme,
I have three essential questions for you:
- What version of MythTV are you using?
- Are you in PAL or NTSC country?
- Do you set some vbi-related options using ivtvctl before running
MythTV?
I looked at MythTV 0.18.1 and I see NO setting for vbi_passthrough,
so I fail to see how MythTV can ever passthrough CC or WSS data.
Can you also make a test run for me that demonstrates the problem,
preferably after a fresh boot of your PC, and mail me the kernel
messages (dmesg output).
Hans
On Monday 08 August 2005 19:16, Graeme Wilford wrote:
Hans,
Apologies, I think the preempt-enabled kernel I built was screwing
with the driver. The results I'm now seeing using a stock FC3 kernel
are identical with and without the patch, ie. at the beginning of a
wide-signal capture, my TV will flip to wide mode. This also works
while switching between wide and narrow channels in Myth. If it's a
wide signal - I get 16:9, if not, I get 4:3. However, skipping around
a wide recording immediately loses the wide mode and I'm unable to get
it back again within that particular recording.
It's like the wss signal is only embedded at the start of a recording
or when a wide-mode change occurs in the signal. During a
skip-forward, Myth (or my TV) reverts back to 4:3 and permanently
'forgets' that the stream was wide rather than defaulting to the
previous VBI mode.
If this is indeed the way VBI wss works, perhaps MythTV should be
caching the most recent wss mode and using that as the default until
it's overriden by another mode-switch..?
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