[Matroska-devel] S_DVBSUB

Andreas Öman andreas at lonelycoder.com
Wed Feb 23 19:36:18 CET 2011

On Wed, Feb 23, 2011 at 6:28 PM, Steve Lhomme <slhomme at matroska.org> wrote:

> On Tue, Feb 22, 2011 at 10:47 PM, Dan Haddix <dan6992 at hotmail.com> wrote:
> > No. The decoder uses the page ID to decide whether or not to display the
> > subtitle based on the composition and ancillary IDs of the selected
> stream.
> > There is no standard way of telling the decoder to ignore the page ID and
> > decode everything. All we can do is trick the decoder into displaying
> > everything by resetting the page ID on every segment to 1 during muxing
> and
> > then setting the composition and ancillary IDs for all MKV tracks to 1 in
> > the player/demuxer. The only other way to do it would be to store the
> real
> > composition and ancillary IDs somewhere in the MKV track, but you seemed
> to
> > be against that originally.
> Well, I don't really see why we have to change a value in the stream
> if in the end the decoder should not handle it (since the track was
> already selected in Matroska). I seems that DVBSUB is a poorly defined
> codec if decoders cannot bypass that step.

FFmpeg's DVBSUB decoder will decode all pages if no CodecPrivate data
is available. So atleast that one should work fine without any modification
to the page IDs

> But in the end I don't care, as we already have to copy common data
> into Matroska, I suppose the header in the DVBSUB source packets will
> already be managed, so changing it to any other value shouldn't be a
> big issue. Just more for on the muxing side.
> --
> Steve Lhomme
> Matroska association Chairman
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