Merge pull request #144 from AOMediaCodec/av1C_essential

Update use of essential field for av1C.

index.bs

@@ -192,7 +192,7 @@ The syntax and semantics of the <dfn>AV1 Item Configuration Property</dfn> are i
   - The values of the fields in the [=AV1CodecConfigurationBox=] shall match those of the [=Sequence Header OBU=] in the [=AV1 Image Item Data=].
   - [=Metadata OBUs=], if present, shall match the values given in other item properties, such as the PixelInformationProperty or ColourInformationBox.
 
-This property shall be marked as essential.
+This property should be marked as essential.
 
 <h4 id ="other-item-property">Other Item Properties</h4>
 
@@ -424,6 +424,7 @@ A file containing a 'pict' track compliant with this profile is expected to list
 <p>The media type <code>"image/avif"</code> is officially registered with IANA and available at: <a href="https://www.iana.org/assignments/media-types/image/avif">https://www.iana.org/assignments/media-types/image/avif</a>.</p>
 
   <h2 id="change-list">Changes since v1.0.0 release</h2>
+- <a href="https://github.com/AOMediaCodec/av1-avif/pull/144">Update use of essential field for av1C.</a>
 - <a href="https://github.com/AOMediaCodec/av1-avif/pull/138">Clarify that constraints on reduced flags apply to non-layered images.</a>
 - <a href="https://github.com/AOMediaCodec/av1-avif/pull/130">Clarify in-profile and out-of-profile restrictions.</a>
 - <a href="https://github.com/AOMediaCodec/av1-avif/pull/127">Replace Media Type section with link to IANA official registration.</a>

index.html

@@ -1214,7 +1214,7 @@
 </style>
   <meta content="Bikeshed version 872cce6d3026423d677f3bd5837f1a1a46299a04" name="generator">
   <link href="https://AOMediaCodec.github.io/av1-avif" rel="canonical">
-  <meta content="835ed501c1550ad4b3c07f920b43d72924f77653" name="document-revision">
+  <meta content="68abca09f94e16bb42baeaa65defb70cbfb90019" name="document-revision">
 <style>/* style-md-lists */
 
 /* This is a weird hack for me not yet following the commonmark spec
@@ -1560,7 +1560,7 @@ <h4 class="heading settled" data-level="2.2.1" id="av1-configuration-item-proper
     <li data-md>
      <p><a data-link-type="dfn" href="#biblio-av1" id="ref-for-biblio-av1①⓪">Metadata OBUs</a>, if present, shall match the values given in other item properties, such as the PixelInformationProperty or ColourInformationBox.</p>
    </ul>
-   <p>This property shall be marked as essential.</p>
+   <p>This property should be marked as essential.</p>
    <h4 class="heading settled" data-level="2.2.2" id="other-item-property"><span class="secno">2.2.2. </span><span class="content">Other Item Properties</span><a class="self-link" href="#other-item-property"></a></h4>
    <p>In addition to the Image Properties defined in <a data-link-type="biblio" href="#biblio-heif">[HEIF]</a>, such as <a class="property" data-link-type="propdesc" href="#biblio-heif" id="ref-for-biblio-heif">colr</a>, <a class="property" data-link-type="propdesc" href="#biblio-heif" id="ref-for-biblio-heif①">pixi</a> or <a class="property" data-link-type="propdesc" href="#biblio-heif" id="ref-for-biblio-heif②">pasp</a>, <a data-link-type="dfn" href="#av1-image-item" id="ref-for-av1-image-item③">AV1 image items</a> MAY also be associated with <a class="property" data-link-type="propdesc" href="#biblio-isobmff" id="ref-for-biblio-isobmff①">clli</a>, <a class="property" data-link-type="propdesc" href="#biblio-isobmff" id="ref-for-biblio-isobmff②">cclv</a> and <a class="property" data-link-type="propdesc" href="#biblio-isobmff" id="ref-for-biblio-isobmff③">mdcv</a> introduced in <a data-link-type="biblio" href="#biblio-miaf">[MIAF]</a>.</p>
    <p>In general, it is recommended to use properties instead of <a data-link-type="dfn" href="#biblio-av1" id="ref-for-biblio-av1①①">Metadata OBUs</a> in the <a data-link-type="dfn" href="#av1-item-configuration-property" id="ref-for-av1-item-configuration-property①">AV1 Item Configuration Property</a>.</p>
@@ -1733,6 +1733,8 @@ <h2 class="heading settled" data-level="8" id="mime-registration"><span class="s
    <p>The media type <code>"image/avif"</code> is officially registered with IANA and available at: <a href="https://www.iana.org/assignments/media-types/image/avif">https://www.iana.org/assignments/media-types/image/avif</a>.</p>
    <h2 class="heading settled" data-level="9" id="change-list"><span class="secno">9. </span><span class="content">Changes since v1.0.0 release</span><a class="self-link" href="#change-list"></a></h2>
    <ul>
+    <li data-md>
+     <p><a href="https://github.com/AOMediaCodec/av1-avif/pull/144">Update use of essential field for av1C.</a></p>
     <li data-md>
      <p><a href="https://github.com/AOMediaCodec/av1-avif/pull/138">Clarify that constraints on reduced flags apply to non-layered images.</a></p>
     <li data-md>