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@@ -2519,7 +2519,7 @@ <h3 class="heading settled" data-level="3.4" id="obu-iasequenceheader"><span cla
 </pre>
    <p><b>Semantics</b></p>
    <p><dfn data-dfn-type="dfn" data-noexport id="ia_code">ia_code<a class="self-link" href="#ia_code"></a></dfn> is a ‘four-character code’ (4CC), <code>iamf</code>.</p>
-   <p class="note" role="note"><span class="marker">NOTE:</span> When IA OBUs are delivered over a protocol that does not provide explicit <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⓪">IA Sequence</a> boundaries, a parser may locate the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②①">IA Sequence</a> start by searching for the code <code>iamf</code> preceded by specific OBU header values. For example, by assuming that <a data-link-type="dfn" href="#obu_extension_flag" id="ref-for-obu_extension_flag①">obu_extension_flag</a> is set to 0 and because <a data-link-type="dfn" href="#obu_trimming_status_flag" id="ref-for-obu_trimming_status_flag">obu_trimming_status_flag</a> is set to 0 for an <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑤">IA Sequence Header OBU</a>, the OBU header can be 0xF806 or 0xFC06.</p>
+   <p class="note" role="note"><span class="marker">NOTE:</span> When IA OBUs are delivered over a protocol that does not provide explicit <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②⓪">IA Sequence</a> boundaries, a parser may locate the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②①">IA Sequence</a> start by searching for the code <code>iamf</code> preceded by specific OBU header values. For example, by assuming that <a data-link-type="dfn" href="#obu_extension_flag" id="ref-for-obu_extension_flag①">obu_extension_flag</a> is set to 0 and because <a data-link-type="dfn" href="#obu_trimming_status_flag" id="ref-for-obu_trimming_status_flag">obu_trimming_status_flag</a> is set to 0 for an <a data-link-type="dfn" href="#ia-sequence-header-obu" id="ref-for-ia-sequence-header-obu⑤">IA Sequence Header OBU</a>, the OBU header can be either 0xF806 or 0xFC06.</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="primary_profile">primary_profile</dfn> indicates the primary profile that this <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②②">IA Sequence</a> complies with. Parsers compliant with this version of the specification SHOULD discard the <a data-link-type="dfn" href="#ia-sequence" id="ref-for-ia-sequence②③">IA Sequence</a> if they do not support the value indicated here.</p>
    <p>The mappings below are applied for both <a data-link-type="dfn" href="#primary_profile" id="ref-for-primary_profile">primary_profile</a> and <a data-link-type="dfn" href="#additional_profile" id="ref-for-additional_profile">additional_profile</a>.</p>
    <ul>
@@ -2563,7 +2563,7 @@ <h3 class="heading settled" data-level="3.5" id="obu-codecconfig"><span class="s
    <p>Parsers compliant with this version of the specification SHOULD ignore <a data-link-type="dfn" href="#codec-config-obu" id="ref-for-codec-config-obu③">Codec Config OBU</a>s with an unknown <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id①">codec_id</a>.</p>
    <p class="note" role="note"><span class="marker">NOTE:</span> <a class="property css" data-link-type="property" href="https://www.iso.org/standard/77752.html#" id="ref-for-something④">ipcm</a> should not be confused with <code>lpcm</code>, which is another 4CC to identify codecs in other container formats (e.g., QuickTime).</p>
    <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="num_samples_per_frame">num_samples_per_frame</dfn> indicates the frame length, in samples, of the <a data-link-type="dfn" href="#audio_frame" id="ref-for-audio_frame">audio_frame()</a> provided in the <code>audio_frame_obu</code>. It SHALL NOT be set to zero. If the <a data-link-type="dfn" href="#decoder_config" id="ref-for-decoder_config④">decoder_config()</a> structure for a given codec specifies a value for the frame length, the two values SHALL be equal.</p>
-   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_roll_distance">audio_roll_distance</dfn> indicates how many audio frames prior to the current audio frame need to be decoded (and the decoded samples discarded) to set the encoder in a state that will produce the perfect decoded audio signal. It SHALL always be a negative value or zero. For some audio codecs, even if an audio frame can be decoded independently, the decoded signal after decoding only that frame may not represent a perfect, decoded audio signal, even ignoring compression artifacts. This can be due to overlap transforms. While potentially acceptable when starting to decode an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⓪">Audio Substream</a>, it may be problematic when automatically switching between similar <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④①">Audio Substream</a>s of different quality and/or bitrate.</p>
+   <p><dfn class="dfn-paneled" data-dfn-type="dfn" data-noexport id="audio_roll_distance">audio_roll_distance</dfn> indicates how many audio frames prior to the current audio frame need to be decoded (and the decoded samples discarded) to set the decoder in a state that will produce the perfect decoded audio signal. It SHALL always be a negative value or zero. For some audio codecs, even if an audio frame can be decoded independently, the decoded signal after decoding only that frame may not represent a perfect, decoded audio signal, even ignoring compression artifacts. This can be due to overlap transforms. While potentially acceptable when starting to decode an <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④⓪">Audio Substream</a>, it may be problematic when automatically switching between similar <a data-link-type="dfn" href="#audio-substream" id="ref-for-audio-substream④①">Audio Substream</a>s of different quality and/or bitrate.</p>
    <ul>
     <li data-md>
      <p>It SHALL be set to -R when <a data-link-type="dfn" href="#codec_id" id="ref-for-codec_id②">codec_id</a> is set to <a class="property css" data-link-type="property" href="https://opus-codec.org/docs/opus_in_isobmff.html#" id="ref-for-something⑤">Opus</a>, where R is <code>ceil(3840 / <a data-link-type="dfn" href="#num_samples_per_frame" id="ref-for-num_samples_per_frame③">num_samples_per_frame</a>)</code>.</p>