[FFmpeg-devel] mpegts private sections stream support

[Mark Buechler]

Hi.

On Wed, Mar 12, 2008 at 3:21 PM, M?ns Rullg?rd <mans at mansr.com> wrote:

> "Mark Buechler" <mark.buechler at gmail.com> writes:
>
> > Hi
> >
> > On Tue, Mar 11, 2008 at 7:22 PM, Mark Buechler <mark.buechler at gmail.com>
> > wrote:
> >
> >> Hi
> >>
> >>
> >> On Tue, Mar 11, 2008 at 7:13 PM, M?ns Rullg?rd <mans at mansr.com> wrote:
> >>
> >> > "Mark Buechler" <mark.buechler at gmail.com> writes:
> >> >
> >> > > Hi, I'm trying to add support for reading ts streams which have a
> PID
> >> > of
> >> > > type 0x05 (STREAM_TYPE_PRIVATE_SECTION). I've defined a new codec
> id
> >> > of
> >> >
> >> > Out of interest, what are those private sections, and how do you
> >> > identify them?
> >> >
> >> > > CODEC_ID_DVB_PRIVSEC in avcodec.h and added an entry in mpegts.cfor
> >> > > new_pes_av_stream() to set the codec_id to CODEC_ID_DVB_PRIVSEC and
> >> > type of
> >> > > CODEC_TYPE_DATA for my new stream. However, calls to av_get_frame()
> >> > never
> >> > > return packets from my stream.
> >> > >
> >> > > Is there something else I need to look at? The stream has no
> >> > descriptors,
> >> > > but I wouldn't think that would have anything to do with it.
> >> >
> >> > The TS demuxer is a mess.  I'm working on and off on a replacement
> >> > (haven't had a lot of time for it lately, but it's getting there).
>  If
> >> > you have any interesting samples, please upload them.  I'd be
> >> > especially interested in samples where a stream changes PID.
> >> >
> >> > --
> >> > M?ns Rullg?rd
> >> > mans at mansr.com
> >
> >> >
> >>
> >> The streams contain plain text and don't have any distinguishing bits,
> >> that I can see. I've been staring at this for a couple days and haven't
> >> gotten anywhere. Any help you can provide would be much appreciated.
> >>
> >> I'll send you a link to a sample separate from the list.
> >>
> >> Thanks, Mark.
> >>
> >
> > Ok, after more investigation, it seems my stream is not a standard mpeg2
> PES
> > stream and is hanging up in mpegts_push_data(). It is expecting a header
> > starting with:
> >
> > 00 00 01
> >
> > And my stream's header is:
> >
> > 00 d3 b0 52 00 00 fd 00 00
> >
> > So, I could create another case for that header and set the pes state to
> > MPEGTS_PAYLOAD, but I'm not sure that's the correct thing to do. Does
> anyone
> > recognize that header or have any suggestions on how to proceed?
>
> Those are private_section packets as defined in the MPEG spec with a
> table_id of 0xd3, which is deep in the private range.  Presumably some
> document defines what this is in this particular context (DVB?), but
> I'm at a loss to find it.
>
> --
> M?ns Rullg?rd
> mans at mansr.com
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>

Can you send me or point me to any docs you're aware of that discuss private
section tables?

Thanks, Mark.