Vladimir Ivanov wrote:
>
> My question is connected to the PMT PID. MPEG-2 allows several services (programs)
>to have the same PMT PID, since the services have
> unique numbers ('program_number' in PMT), every 'TS_program_map_section' describing
>a service.
>
> On Hotbird, 12111/V/27500 services #717 and #730 share the same PMT PID 1040. But
>alas, there is only one section and it seems to
> *change* in time, sometime you get the program map for service #717 and sometime for
>#730. All this while keeping version_number the
> same!!!
>
> I think this is some kind against MPEG-2 standard.
No, it's not. ISO 13818-1 says about the PMT:
"It may be segmented to occupy multiple sections. In each section,
the section number field shall be set to zero. Sections are
identified by the program_number field."
IOW, the PMT is segmented into sub tables, with table_id_extended =
program_number.
The concept of sub tables is explained e.g. in ETSI technical
recommendation ETR 211.
Regards,
Johannes
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