[Subhandler-devel] Re: SVCD subtitles

[Laurent P. <lau...@sk...>]

> > What about the format generated by transcode ?
> >
> > $ tccat -i /path/to/vob/ -T 1 -L | tcextract -x ps1 -t vob -a 0x22 >
> > subs-en
>
> Yes, I think that's one candidate.  Though we must ponder what are the
> advantages and disadvantages, what is gained and what is lost when
> compared to the PES or VobSub.

What is PES ?

> Notice, anyway, that transcode is unable to extract SVCD articles (I
> don't know if CVD would work) because, at least, there is the problem
> that all SVCD subtitles are at stream 0x70 so, even if no other problems
> appeared, it would mix them in the output.

Do you mean that all the subtitles are multiplexed in a single elementary 
stream ?

> And the PS1 format probably would have to be extended to signal the kind
> of subtitle so that the image can be reconstructed.

What do you mean ?

> The disadvantage of PES, if I recall correctly is that it has no palette
> information on DVD subtitle streams (it comes from the IFO).  Does it
> matter for multiplexing?  I don't know.

I'll keep that in mind. It might not matter for multiplexing but it probably 
will later.

> If we have to propose one, and only one, format as input to the
> multiplexer then it should be one that makes sense.

Agreed.

> I have added some links (the Philips links were hard to get) to the
> project web page at:
>
> 	http://subhandler.sourceforge.net

Do you have more information about MPEG2, especially an overview and the 
headers/packets format ?

> Also, I created a mailing list for developers.  I suggest we move
> general discussion there, so that it is archived and visible to others
> that might jump in.

Done :-)

Laurent Pinchart