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@@ -1194,6 +1194,9 @@ <h2 id="name-copyright-notice">
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.6">
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<p id="section-toc.1-1.5.2.6.1"><a href="#section-5.6" class="auto internal xref">5.6</a>.  <a href="#name-pcr-and-timing" class="internal xref">PCR and Timing</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.5.2.7">
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<p id="section-toc.1-1.5.2.7.1"><a href="#section-5.7" class="auto internal xref">5.7</a>.  <a href="#name-splice-signaling" class="internal xref">Splice Signaling</a></p>
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</li>
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</ul>
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</li>
@@ -1228,7 +1231,10 @@ <h2 id="name-copyright-notice">
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<p id="section-toc.1-1.6.2.9.1"><a href="#section-6.9" class="auto internal xref">6.9</a>.  <a href="#name-m2ts-timestamp-mode" class="internal xref">M2TS Timestamp Mode</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.10">
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<p id="section-toc.1-1.6.2.10.1"><a href="#section-6.10" class="auto internal xref">6.10</a>. <a href="#name-initialization-data" class="internal xref">Initialization Data</a></p>
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<p id="section-toc.1-1.6.2.10.1"><a href="#section-6.10" class="auto internal xref">6.10</a>. <a href="#name-m2ts-scte-35-pid" class="internal xref">M2TS SCTE-35 PID</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.6.2.11">
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<p id="section-toc.1-1.6.2.11.1"><a href="#section-6.11" class="auto internal xref">6.11</a>. <a href="#name-initialization-data" class="internal xref">Initialization Data</a></p>
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</li>
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</ul>
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</li>
@@ -1246,6 +1252,9 @@ <h2 id="name-copyright-notice">
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.7.2.4">
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<p id="section-toc.1-1.7.2.4.1"><a href="#section-7.4" class="auto internal xref">7.4</a>.  <a href="#name-multi-program-source-two-pr" class="internal xref">Multi-Program Source — Two Programs from One MPTS</a></p>
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</li>
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<li class="compact toc ulBare ulEmpty" id="section-toc.1-1.7.2.5">
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<p id="section-toc.1-1.7.2.5.1"><a href="#section-7.5" class="auto internal xref">7.5</a>.  <a href="#name-abr-alternate-renditions-tw" class="internal xref">ABR Alternate Renditions — Two Bitrate Tracks</a></p>
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</li>
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</ul>
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</li>
@@ -1417,7 +1426,7 @@ <h2 id="name-scope">
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continuity counter, or scrambling semantics defined by <span>[<a href="#ISO138181" class="cite xref">ISO138181</a>]</span>.<a href="#section-4-4.3.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-4-4.4">
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<p id="section-4-4.4.1">A mandatory ABR switching model across separately encoded transport streams.<a href="#section-4-4.4.1" class="pilcrow"></a></p>
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<p id="section-4-4.4.1">A mandatory Adaptive Bitrate (ABR) switching model across separately encoded transport streams.<a href="#section-4-4.4.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-4-4.5">
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<p id="section-4-4.5.1">A key management protocol.<a href="#section-4-4.5.1" class="pilcrow"></a></p>
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<a href="#section-5.2" class="section-number selfRef">5.2. </a><a href="#name-object-boundaries" class="section-name selfRef">Object Boundaries</a>
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</h3>
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<p id="section-5.2-1">Object boundaries are packaging boundaries and do not change MPEG-2 Transport
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Stream semantics. Continuity counters, adaptation fields, PCR, PTS, DTS, PSI,
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and other transport-stream syntax remain inside the source packets.<a href="#section-5.2-1" class="pilcrow"></a></p>
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Stream semantics. Continuity counters, adaptation fields, PCR, PTS, DTS,
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Program Specific Information (PSI), and other transport-stream syntax remain
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inside the source packets.<a href="#section-5.2-1" class="pilcrow"></a></p>
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<p id="section-5.2-2">A publisher <span class="bcp14">SHOULD</span> place an independently usable random access point at the
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first media Object of each MOQT Group. For video, this normally means that the
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Group begins at or before the transport-stream packets carrying a random access
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the Group content is independently decodable without reference to prior Groups.
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For video, a valid Group start is any intra-coded access point at which all
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decoder references needed by that Group are present within the Group itself.
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IDR frames always satisfy this condition. A CRA frame <span class="bcp14">MAY</span> serve as a Group
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start only if no subsequent RASL pictures in that Group reference frames from
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a prior Group. Publishers are not required to start a new Group at every
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intra-coded access point: a CRA whose following RASL pictures reference only
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frames present earlier in the same Group may remain interior to that Group.
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Instantaneous Decoder Refresh (IDR) frames always satisfy this condition.
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A Clean Random Access (CRA) frame <span class="bcp14">MAY</span> serve as a Group start only if no
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subsequent Random Access Skipped Leading (RASL) pictures in that Group
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reference frames from a prior Group. Publishers are not required to start a
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new Group at every intra-coded access point: a CRA whose following RASL
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pictures reference only frames present earlier in the same Group may remain
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interior to that Group.
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The Object ID <span class="bcp14">MUST</span> increase by one for each Object within a Group unless MOQT
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delivery semantics permit gaps that are explicitly intended by the publisher.<a href="#section-5.3-1" class="pilcrow"></a></p>
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<p id="section-5.3-2">For VOD streams, Group ID and Object ID assignment <span class="bcp14">SHOULD</span> be stable for a given
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<p id="section-5.3-2">For video-on-demand (VOD) streams, Group ID and Object ID assignment <span class="bcp14">SHOULD</span> be stable for a given
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asset so that relays and subscribers can cache and request repeatable ranges.<a href="#section-5.3-2" class="pilcrow"></a></p>
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</section>
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</div>
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each track contains only:<a href="#section-5.5-1" class="pilcrow"></a></p>
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<ul class="normal">
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<li class="normal" id="section-5.5-2.1">
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<p id="section-5.5-2.1.1">Null packets (PID 0x1FFF), which <span class="bcp14">MAY</span> be removed or retained at the
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publisher's discretion.<a href="#section-5.5-2.1.1" class="pilcrow"></a></p>
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<p id="section-5.5-2.1.1">Null packets with Packet Identifier (PID) 0x1FFF, which <span class="bcp14">MAY</span> be removed or
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retained at the publisher's discretion.<a href="#section-5.5-2.1.1" class="pilcrow"></a></p>
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</li>
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<li class="normal" id="section-5.5-2.2">
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<p id="section-5.5-2.2.1">Program Association Table packets (PID 0x0000), rewritten to list only the
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wrap-around.<a href="#section-5.6-3" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="splice-signaling">
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<section id="section-5.7">
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<h3 id="name-splice-signaling">
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<a href="#section-5.7" class="section-number selfRef">5.7. </a><a href="#name-splice-signaling" class="section-name selfRef">Splice Signaling</a>
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</h3>
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<p id="section-5.7-1">SCTE-35 splice information is carried transparently in the TS stream as
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splice_info_section() messages on their designated PID. Publishers <span class="bcp14">MAY</span> surface
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splice events via the MSF Event Timeline <span>[<a href="#MSF" class="cite xref">MSF</a>]</span>. This document does not
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specify SCTE-35 processing.<a href="#section-5.7-1" class="pilcrow"></a></p>
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</section>
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</div>
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</section>
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</div>
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<div id="catalog">
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<td class="text-left" rowspan="1" colspan="1">m2tsTimestampMode</td>
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<td class="text-left" rowspan="1" colspan="1">
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<a href="#m2ts-timestamp-mode" class="auto internal xref">Section 6.9</a>
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</td>
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</tr>
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<tr>
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<td class="text-left" rowspan="1" colspan="1">M2TS SCTE-35 PID</td>
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<td class="text-left" rowspan="1" colspan="1">m2tsScte35Pid</td>
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<td class="text-left" rowspan="1" colspan="1">
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<a href="#m2ts-scte35-pid" class="auto internal xref">Section 6.10</a>
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</td>
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</tr>
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<tr>
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<td class="text-left" rowspan="1" colspan="1">Initialization data</td>
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<td class="text-left" rowspan="1" colspan="1">initData</td>
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<td class="text-left" rowspan="1" colspan="1">
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<a href="#init-data" class="auto internal xref">Section 6.10</a>
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<a href="#init-data" class="auto internal xref">Section 6.11</a>
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</td>
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</tr>
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</tbody>
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semantics. This field <span class="bcp14">MUST NOT</span> be present when <code>m2tsPacketSize</code> is 188.<a href="#section-6.9-2" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="init-data">
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<div id="m2ts-scte35-pid">
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<section id="section-6.10">
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<h3 id="name-m2ts-scte-35-pid">
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<a href="#section-6.10" class="section-number selfRef">6.10. </a><a href="#name-m2ts-scte-35-pid" class="section-name selfRef">M2TS SCTE-35 PID</a>
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</h3>
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<p id="section-6.10-1">Required: Optional JSON Type: Number Location: Track Object<a href="#section-6.10-1" class="pilcrow"></a></p>
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<p id="section-6.10-2">The PID carrying SCTE-35 splice_info_section() messages for this track. This
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field is advisory; SCTE-35 messages are also discoverable via the PMT CA/registration
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descriptor. When present, receivers <span class="bcp14">MAY</span> use this value to locate splice events
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without parsing PMT. Publishers <span class="bcp14">SHOULD</span> include this field when the track carries
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SCTE-35 splice signaling.<a href="#section-6.10-2" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="init-data">
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<section id="section-6.11">
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<h3 id="name-initialization-data">
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<a href="#section-6.10" class="section-number selfRef">6.10. </a><a href="#name-initialization-data" class="section-name selfRef">Initialization Data</a>
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<a href="#section-6.11" class="section-number selfRef">6.11. </a><a href="#name-initialization-data" class="section-name selfRef">Initialization Data</a>
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</h3>
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<p id="section-6.10-1">Required: Optional JSON Type: String Location: Track Object<a href="#section-6.10-1" class="pilcrow"></a></p>
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<p id="section-6.10-2">An m2ts track <span class="bcp14">MAY</span> use the MSF <code>initData</code> field to carry Base64 <span>[<a href="#BASE64" class="cite xref">BASE64</a>]</span>
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<p id="section-6.11-1">Required: Optional JSON Type: String Location: Track Object<a href="#section-6.11-1" class="pilcrow"></a></p>
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<p id="section-6.11-2">An m2ts track <span class="bcp14">MAY</span> use the MSF <code>initData</code> field to carry Base64 <span>[<a href="#BASE64" class="cite xref">BASE64</a>]</span>
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encoded initialization data. If present, the decoded value <span class="bcp14">MUST</span> be a sequence
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of whole source packets using the packet size declared by <code>m2tsPacketSize</code>.<a href="#section-6.10-2" class="pilcrow"></a></p>
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<p id="section-6.10-3">Publishers <span class="bcp14">SHOULD</span> include current PAT and PMT packets in <code>initData</code> when those
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of whole source packets using the packet size declared by <code>m2tsPacketSize</code>.<a href="#section-6.11-2" class="pilcrow"></a></p>
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<p id="section-6.11-3">Publishers <span class="bcp14">SHOULD</span> include current PAT and PMT packets in <code>initData</code> when those
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tables are not guaranteed to be available at the first Object of each Group.
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When PSI changes within a live track, publishers <span class="bcp14">SHOULD</span> update <code>initData</code> to
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reflect the new PAT and PMT before publishing subsequent Objects.
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Receivers <span class="bcp14">MUST NOT</span> assume that <code>initData</code> remains valid after a version change
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in transport-stream PSI; updated PSI in the media Objects takes precedence.<a href="#section-6.10-3" class="pilcrow"></a></p>
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in transport-stream PSI; updated PSI in the media Objects takes precedence.<a href="#section-6.11-3" class="pilcrow"></a></p>
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</section>
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</div>
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</section>
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</div>
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</section>
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</div>
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<div id="example-abr">
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<section id="section-7.5">
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<h3 id="name-abr-alternate-renditions-tw">
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<a href="#section-7.5" class="section-number selfRef">7.5. </a><a href="#name-abr-alternate-renditions-tw" class="section-name selfRef">ABR Alternate Renditions — Two Bitrate Tracks</a>
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</h3>
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<p id="section-7.5-1">This example shows a catalog for a live channel published at two bitrates as
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alternate renditions. Both tracks are in the same <code>altGroup</code>; video tracks
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<span class="bcp14">MUST</span> align Group boundaries at identical presentation positions. The tracks
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use different PID assignments: a subscriber switching between them <span class="bcp14">MUST</span> re-parse
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PAT and PMT on the new track before routing packets to a decoder.<a href="#section-7.5-1" class="pilcrow"></a></p>
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<div class="lang-json sourcecode" id="section-7.5-2">
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<pre>
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{
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"version": 1,
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"generatedAt": 1746104606044,
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"tracks": [
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{
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"name": "video-high",
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"namespace": "live.example.com/channel/1",
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"packaging": "m2ts",
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"isLive": true,
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"targetLatency": 1000,
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"role": "video",
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"mimeType": "video/mp2t",
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"bitrate": 6000000,
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"altGroup": 1,
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"m2tsPacketSize": 188,
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"m2tsPacketsPerObject": 64,
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"m2tsProgramNumber": 1,
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"m2tsPmtPid": 256,
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"m2tsPcrPid": 257,
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"m2tsPsiInterval": 100,
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"m2tsRandomAccess": true
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},
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{
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"name": "video-low",
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"namespace": "live.example.com/channel/1",
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"packaging": "m2ts",
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"isLive": true,
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"targetLatency": 1000,
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"role": "video",
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"mimeType": "video/mp2t",
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"bitrate": 2000000,
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"altGroup": 1,
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"m2tsPacketSize": 188,
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"m2tsPacketsPerObject": 64,
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"m2tsProgramNumber": 1,
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"m2tsPmtPid": 512,
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"m2tsPcrPid": 513,
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"m2tsPsiInterval": 100,
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"m2tsRandomAccess": true
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}
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]
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}
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</pre><a href="#section-7.5-2" class="pilcrow"></a>
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</div>
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</section>
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</div>
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</section>
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</div>
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<div id="subscriber-processing">
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value received on the new track as the initial reference. In addition to the
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Group boundary alignment requirements above, publishers providing alternate
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tracks <span class="bcp14">SHOULD</span> align presentation timestamps at Group boundaries across tracks
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to enable seamless presentation switching at the application layer.<a href="#section-10-3" class="pilcrow"></a></p>
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to enable seamless presentation switching at the application layer.
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Because PID assignments need not match across alternate tracks, a receiver
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<span class="bcp14">MUST</span> re-parse the PAT and PMT of the new track after every track switch before
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routing elementary-stream packets to a decoder.<a href="#section-10-3" class="pilcrow"></a></p>
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</section>
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</div>
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<div id="content-protection">

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