On Wednesday 01 April 2009 06:32:55 Christopher Neufeld wrote:
> I just upgraded my mythtv system and lost the ability to see captions.
> The mythtv folks suggested that I check here in case it's a known issue.
>
> Three years ago, Hans and I exchanged many emails as we got the cx25840
> captioning working with the drivers of that era, but now, with the
> upgraded mythtv, I've had to move to the newer drivers and API.
>
> I've got KnoppMyth for my mythtv box, running a 2.6.23 kernel that's
> about 9 months old.
>
> Running the command:
> # v4l2-ctl --get-sliced-vbi-out-cap
> produces no output.
>
> It appears that the driver can capture sliced VBI, but cannot inject the
> resulting data into the MPEG stream on the /dev/video* device. Is that
> an accurate interpretation?
>
>
> If the insertion of captions into the MPEG stream is not available for my
> hardware yet, I'm happy to work on this again.
No, it's working. You have to use 'v4l2-ctl -c stream_vbi_format=1' to
enable it.
That said, sliced VBI was broken for quite some time, i.e. it would produce
garbled closed captions. That was fixed in 2.6.27.
And I don't know where you got v4l2-ctl from, but a bug in that program
relating to --get-sliced-vbi-out-cap was fixed October 2007. It seems you
have that buggy v4l2-ctl version.
If you want reliable captions, then I strongly recommend updating to 2.6.27.
Or install the v4l-dvb repository on top of your kernel.
Regards,
Hans
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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