On Sunday 08 May 2005 18:34, Chris Kennedy wrote:
> Wondering how this is supposed to work, I know Myth inserts the VBI into
> the mpeg stream, and that it's there, and during playback you can run
> vbi /dev/vbi4 and see the CC there. But how do we, or can we already?
> output that data to the 350 output, does /dev/vbi8 do this, but how?
ivtvctl -w cc
What it does is that it reads the embedded VBI stream (the same that can be
read through /dev/vbi8) and programs the saa7127 with the CC values.
However, I've never been able to test it (being in PAL country) and the few
tests that several people have done indicate that there are timing problems
with this. The CC registers have to be programmed at the right time 30 times
per second. What exactly the 'right time' is was not entirely clear to me.
Basically this is something that only someone with access to NTSC programming
and a CC-capable TV can examine and fix. I'm stuck here.
Another problem is that I'm still convinced that the embedded VBI data in the
mpeg stream is out of sync with the video/audio. In theory the PTS values
stored in the stream could be used to sync them up, but that requires some
experimentation.
Hans
> I haven't ever seen correct CC output, or any actually, on my pvr350,
> so really curious if anyone knows more about this, I think the driver
> is back to where this should all work, now you can have Myth setup for CC
> and it works like it did before, actually I would think it works alot more
> stable now, no corruption of the mpeg stream and uses DMA. So maybe I've
> done something which breaks output, or possibly it hasn't ever worked as
> expected for CC?
>
> Please test the latest version, I think stream wise and memory allocation
> wise the driver is very solid now, and shouldn't get into situations where
> things hit buffers when not allocated, and use memory very efficiently, but
> check and see what bugs remain and let me know in the current release.
>
> Thanks,
> Chris
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