[vlc-devel] Re: Encapsulation of dvd subs in TS

Måns Rullgård mru at inprovide.com
Sat Jun 4 13:37:12 CEST 2005

Sigmund Augdal <sigmunau at stud.ntnu.no> writes:

> On Fri, Jun 03, 2005 at 06:04:00PM +0200, Nico Sabbi wrote:
>> Hi,
>> yesterday I noticed that recent versions of vlc assign to dvd subs a 
>> substream id=0x1n,
>> while previously they used 0x2n (the same as dvd).
>> Is it a bug or intentional?
>> Second thing: previously the stream_type in the PMT was 0x9n, while now 
>> it seems to be always 0x82.
>> Is it going to change again?
> I am no expert on this, but it is my impression that dvd subtitles should
> not be embedded in mpeg2 ts. VLC used to do this, because it had no better
> alternative. Nowadays however vlc can transcode dvd subtitles into dvb
> subtitles, that can safely be embedded in mpeg2 ts. 

It should be pointed out that neither of the subtitle formats are
standardized by the ISO for inclusion in any MPEG variant, so we're
talking extensions whatever we do.  It's still a good idea to use
extensions that are standardized by someone, be it the DVD consortium
or ETSI.  Just remember that non-DVB uses of MPEG TS may or may not
support DVB subtitles.  I'm thinking of things like IP STBs here.

Måns Rullgård
mru at inprovide.com

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