[mythtv-users] Re: subtitles Re: Reuters: FCC Overstepped Authority on Digital TV

Lane Schwartz dowobeha at gmail.com
Wed Mar 2 19:38:38 UTC 2005

On Tue, 1 Mar 2005 22:03:36 +0100, Martin Barnasconi
<mythtv at barnasconi.net> wrote:
> > Well, MPEGs *can* have subtitle information embedded, AFAIK. Whether or
> > not a particular content producer embeds them is another story. Right
> > now I don't think Myth supports MPEG subtitles, but the point is the
> > information *should* be there and accessible by standard consumer
> > devices**... perhaps someone familiar with the Americans with
> > Disabilities Act could shed some light.
> Current status is that for PVR cards using the IVTV driver, the sliced
> vertical blanking interval (VBI) stream, containing teletext/subtitles/CC,
> is now embedded in the MPEG2 program stream (PS). Note that this embedding is
> IVTV driver specific. VBI Decoding support in mythtv is in process.
> For DVB MPEG transport streams (TS), VBI has its own PID and should be
> detected differently. Similar approach, but you need a different detection
> procedure here.
> > Not necessarily. AFAIK only Myth has the ability to record VBI data and
> > convert it to subtitles for display afterwards. I doubt ReplayTV or
> > Tivo can do this. (NB- Myth only supports this currently for analog
> > framegrabber (bttv) cards), though support the VBI interface on ivtv
> > cards is maturing, so Myth may support them at some point, too.

So does this mean that CC info can be displayed from PVR-250 recordings?

If so, do you know what ivtv version is required?


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