[Matroska-devel] S_DVBSUB

Moritz Bunkus moritz at bunkus.org
Mon Aug 23 09:10:06 CEST 2010

Hey ho,

On Monday 23 August 2010 09:00:06 Andreas Öman wrote:

> I also suggest (based on some discussion on IRC) that no extradata is
> added with composition and ancillary ID, but rather that the muxing
> application must filter the subtitle segments before muxing.

With "extradata" he means the following:

In a MPEG transport stream DVBSUBs are prefixed with four bytes of data
providing a sub-stream ID. That way several streams inside that DVBSUB
stream can be identified. Think of tracks in tracks.

For Matroska I objected to storing streams that way as you only have one
logical track in a Matroska track. Therefore the proposal to drop those
four bytes and to use only one DVBSUB sub-stream in a single Matroska

I totally agree with that :)

> As this is my first contact with the list; Did I miss anything?

Does that codec need any codec extra data (Matroska element


If Darl McBride was in charge, he'd probably make marriage
unconstitutional too, since clearly it de-emphasizes the commercial
nature of normal human interaction, and probably is a major impediment
to the commercial growth of prostitution. - Linus Torvalds
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