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feat: add m2tsMuxRate field and null-packet CBR warning #10

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mondain merged 1 commit into from
Jul 15, 2026
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feat: add m2tsMuxRate field and null-packet CBR warning #10

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16 changes: 16 additions & 0 deletions draft-gregoire-moq-msfts.md
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Expand Up @@ -250,6 +250,12 @@ each track contains only:
* All packets whose PID is listed in the Program Map Table of the selected
program, including the PCR_PID and the PIDs of all elementary streams.

Removing null packets changes the inter-packet byte spacing that
constant-bit-rate receivers use to recover the mux clock. A subscriber
wishing to reconstruct a constant-bit-rate output stream cannot derive the
original rate from the stream alone; publishers that remove null packets
SHOULD declare the source mux rate using `m2tsMuxRate` ({{m2ts-mux-rate}}).

These rules apply to unscrambled transport stream sources. Publishers filtering
scrambled transport streams MUST also retain the conditional access packets
required for descrambling; conditional access integration is application-specific
Expand Down Expand Up @@ -312,6 +318,7 @@ Table 1 lists the m2ts-specific fields defined within a track object.
| M2TS PMT PID | m2tsPmtPid | {{m2ts-pmt-pid}} |
| M2TS PCR PID | m2tsPcrPid | {{m2ts-pcr-pid}} |
| M2TS PSI interval | m2tsPsiInterval | {{m2ts-psi-interval}} |
| M2TS mux rate | m2tsMuxRate | {{m2ts-mux-rate}} |
| M2TS random access | m2tsRandomAccess | {{m2ts-random-access}} |
| M2TS timestamp mode | m2tsTimestampMode | {{m2ts-timestamp-mode}} |
| M2TS SCTE-35 PID | m2tsScte35Pid | {{m2ts-scte35-pid}} |
Expand Down Expand Up @@ -367,6 +374,15 @@ the Program Association Table and Program Map Table in the packet stream. When
present, publishers SHOULD repeat PSI at an interval no larger than this value
for live content. Subscribers MAY use this value to estimate join latency.

## M2TS Mux Rate {#m2ts-mux-rate}

Required: Optional JSON Type: Number Location: Track Object

The nominal source mux rate of the transport stream in bits per second.
This field is advisory. A subscriber reconstructing a constant-bit-rate
output stream MAY use this value to restore the original mux rate when null
packets have been removed.

## M2TS Random Access {#m2ts-random-access}

Required: Optional JSON Type: Boolean Location: Track Object
Expand Down
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