🚀 go-pugleaf

In article <3g763i$bdj@clarknet.clark.net>, tstark@clark.net (Tim Stark) writes:
|> All:
|>
|>    Do MPEG or MPEG-2 standards support closed caption signals?  My concerns is
|> missing closed caption signals on computer era but only analog video area.
|> When VHS is converted into MPEG or MPEG2 format, all closed caption signal
|> will be lost completely.  Designers should implement closed captions into
|> future MPEG standards or stick with analog TV.

Both MPEG1 and MPEG2 allow for lots of out-of-band data (in fact, entire video
or audio streams can be sent as out-of-band data).  However, I don't know whether
closed-captioning has specifically been addressed or standardized.  I suspect it
has been for MPEG2, since that is being touted as a broadcast standard.

One possibility for the multiple simultaneous audio streams is simultaneous
broadcast in multiple languages, btw.  Just pick the correct audio channel(s)
and listen in English, French, German, Spanish, whatever.

--
  *****                    / walker@unx.sas.com
 *|_o_o|\\     Doug Walker<  BIX, Portal: djwalker
 *|. o.| ||                \ CompuServe: 71165,2274
  | o  |//
  ======
Any opinions expressed are mine, not those of SAS Institute, Inc.

In <3g763i$bdj@clarknet.clark.net> tstark@clark.net (Tim Stark) writes:


>   Do MPEG or MPEG-2 standards support closed caption signals?  My concerns is
>missing closed caption signals on computer era but only analog video area.
>When VHS is converted into MPEG or MPEG2 format, all closed caption signal
>will be lost completely.  Designers should implement closed captions into
>future MPEG standards or stick with analog TV.

As far as I know there is not a direct provision for closed captioning in
either MPEG-1 or -2 video, but broadcast system makers are mostly planning
to convey this data through MPEG user data streams at the picture level.

Stewart Kelly