RE: MPEG-2 TS Metadata Cue

Some questions:


1.       What is the difference between the MpegTsDescriptor[] descriptors in PM section:

interface MpegTsPmt : MpegTsSection { //Transport Stream program map section (see Table 2-28)
    ..
    attribute MpegTsDescriptor[] descriptors;

and the same in Description Table Section


interface MpegTsDescriptionSection : MpegTsSection { // Transport Stream Description Table (see Table 2-30-1)

   attribute MpegTsDescriptor[] descriptors;

}



2.       Is the difference between MpegTsElementaryStream and MpegTsElementaryStreamData[] a typo?



interface MpegTsPmt : MpegTsSection { //Transport Stream program map section (see Table 2-28)

    ..

    attribute MpegTsElementaryStreamData[] streams;

}



interface MpegTsElementaryStream {

   ..

}


3.       Since Elementary Stream Data usually means payload I think this term is confusing.

4.       The tables 2-28 and 2-30-1 don't seem to exist

5.       What is purpose of pcrPID?

6.       Since these are cues should there be timing information?


Regards

Graham


From: Bob Lund [mailto:B.Lund@CableLabs.com]
Sent: Monday, April 28, 2014 3:00 PM
To: public-inbandtracks@w3.org
Cc: Mark Vickers @ Comcast; Giuseppe Pascale; Glenn Adams
Subject: MPEG-2 TS Metadata Cue

Hi All,

Given the direction of the discussion around DataCue, I put together a proposal for an MPEG-2 TS specific metadata cue interface<https://www.w3.org/community/inbandtracks/wiki/Main_Page#MPEG-2_TS_Metadata_Cue>. I'm no WebIDL expert (or even novice) so comments/suggestions are welcome.

The approach is fairly straightforward. There are three types of metadata script can use: program map table, transport stream descriptors and private sections. All of these are tables that have a common set of attributes, including tableId, and table specific attributes. tableId is used to determine the type of table. So, the Cue exposes the tableId and the rest of the table data. The tableId is used to determine the format of the rest of the table data.

Take a look and let me know what you think.

Thanks,
Bob