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fix: rewrite SI table filtering guidance and add rewrite requirement #19

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mondain merged 1 commit into from
Jul 21, 2026
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fix: rewrite SI table filtering guidance and add rewrite requirement #19

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24 changes: 15 additions & 9 deletions draft-gregoire-moq-msfts.md
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Expand Up @@ -268,15 +268,21 @@ scrambled transport streams MUST also retain the conditional access packets
required for descrambling; conditional access integration is application-specific
and outside the scope of this document.

The retain list above is PMT-centric. DVB and ATSC broadcast standards carry
service information on fixed well-known PIDs that the PMT does not reference:
SDT/BAT (0x0011), EIT (0x0012), TDT/TOT (0x0014), and NIT (0x0010), or their
ATSC PSIP equivalents. The filter silently drops these tables, leaving the
resulting track without service identity, EPG, or broadcast time. Publishers
targeting broadcast or IRD deployments SHOULD retain the SI tables required by
the target standard. When SI tables are retained, publishers SHOULD declare the
additional PIDs using `m2tsSiPids` ({{m2ts-si-pids}}) so that subscribers can
verify which tables are present.
The Program Map Table references only the PIDs of the selected program's
elementary streams and PCR; it does not reference the service information
tables defined by DVB and ATSC: Network Information Table (NIT, 0x0010),
Service Description Table and Bouquet Association Table (SDT/BAT, 0x0011),
Event Information Table (EIT, 0x0012), and Time and Date Table with Time
Offset Table (TDT/TOT, 0x0014), or their ATSC PSIP equivalents. The filter
therefore drops these tables, leaving the resulting track without service
identity, EPG, or broadcast time. Publishers producing tracks for broadcast
or IRD reception SHOULD retain the SI tables required by the target standard.
When SI tables are retained, publishers SHOULD declare the additional PIDs
using `m2tsSiPids` ({{m2ts-si-pids}}) so that subscribers can verify which
tables are present. Because SDT and EIT carried from an MPTS describe all
programs in the multiplex, publishers SHOULD filter or rewrite these tables
to include only the service and schedule entries for the carried program;
NIT and TDT/TOT are broadcast-wide and do not require per-program rewriting.

The `m2tsProgramNumber` field ({{m2ts-program-number}}) SHOULD be present on
per-program tracks to identify the program carried. When multiple per-program
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