[mythtv-users] Closed Captioning with HDHomerun and PVR-500 (Philips chipset)

John P Poet jppoet at gmail.com
Sat Apr 7 02:43:20 UTC 2007


On 4/6/07, Daniel Kristjansson <danielk at cuymedia.net> wrote:
>
> On Fri, 2007-04-06 at 14:21 -0700, JS Boyd wrote:
> > Captions are an issue on my current setup SVN 3181.
> >
> > ATSC via HDHomerun captions work, but do not have black backgrounds on
> > most channels and tend to overwrite on top of each other basically
> > making them pretty useless. However, there is an exception. ABC
> > primetime programs like "Lost" seem to work properly: logically placed
> > black backgrounded captions.
>
> With EIA-708 the broadcaster specifies whether the captions
> will have a background as well as the color of the text,
> it's background and the size and angle of the text shadow
> and/or outlining as well as the font, location and animations.
> At this time there is no way to override what the broadcaster
> specifies in MythTV, but this is in my long term plan for
> EIA-708 caption support.
>
> Most of the captions you are seeing are EIA-608 captions
> that have been poorly converted into EIA-708 captions.
> Some programs made for HD, such as "Arrested Development" and
> other top shelf programming have true EIA-708 captions,
> probably because the producers expect a long syndication run.
> "Lost" may well contain well produced EIA-708 captions,
> or they may simply have no EIA-708 captions since "Lost"
> will never be rebroadcast so they want to spare the expense
> of future proofing the program and MythTV is falling back
> to the EIA-608 captions they do broadcast.
>
> -- Daniel
>

One problem I have with EIA-708 captions: they are often party "off the
screen".  I don't think I have that much overscan, but I obviously have
enough to cause a problem.

I, personally, rarely use closed captions, so I don't consider it much of a
problem.

John
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