Disable H264 send for iOS 1.15.1

aws · Nov 17, 2021 · 60b29cb · 60b29cb
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 
 - Fix priority downlink policy bandwidth estimation metrics to work with Safari.
+- Add a workaround to switch to VP8 for iOS 15.1 due to Safari bug that causes crash with H.264 encoding. 
 
 ### Changed
 

diff --git a/demos/browser/package-lock.json b/demos/browser/package-lock.json
diff --git a/docs/assets/js/search.json b/docs/assets/js/search.json
diff --git a/docs/classes/defaultbrowserbehavior.html b/docs/classes/defaultbrowserbehavior.html
@@ -107,6 +107,7 @@ <h3>Methods</h3>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requiresbundlepolicy" class="tsd-kind-icon">requires<wbr>Bundle<wbr>Policy</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requirescheckforsdpconnectionattributes" class="tsd-kind-icon">requires<wbr>Check<wbr>For<wbr>Sdp<wbr>Connection<wbr>Attributes</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requirescontextrecreationforaudioworklet" class="tsd-kind-icon">requires<wbr>Context<wbr>Recreation<wbr>For<wbr>Audio<wbr>Worklet</a></li>
+								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requiresdisablingh264encoding" class="tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requiresgroupidmediastreamconstraints" class="tsd-kind-icon">requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requiresicecandidategatheringtimeoutworkaround" class="tsd-kind-icon">requires<wbr>Ice<wbr>Candidate<wbr>Gathering<wbr>Timeout<wbr>Workaround</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultbrowserbehavior.html#requiresnoexactmediastreamconstraints" class="tsd-kind-icon">requires<wbr>NoExact<wbr>Media<wbr>Stream<wbr>Constraints</a></li>
@@ -394,6 +395,24 @@ <h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</
 						</li>
 					</ul>
 				</section>
+				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
+					<a name="requiresdisablingh264encoding" class="tsd-anchor"></a>
+					<h3>requires<wbr>Disabling<wbr>H264<wbr>Encoding</h3>
+					<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class">
+						<li class="tsd-signature tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
+					</ul>
+					<ul class="tsd-descriptions">
+						<li class="tsd-description">
+							<aside class="tsd-sources">
+								<p>Implementation of <a href="../interfaces/extendedbrowserbehavior.html">ExtendedBrowserBehavior</a>.<a href="../interfaces/extendedbrowserbehavior.html#requiresdisablingh264encoding">requiresDisablingH264Encoding</a></p>
+								<ul>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/browserbehavior/DefaultBrowserBehavior.ts#L281">src/browserbehavior/DefaultBrowserBehavior.ts:281</a></li>
+								</ul>
+							</aside>
+							<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
+						</li>
+					</ul>
+				</section>
 				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 					<a name="requiresgroupidmediastreamconstraints" class="tsd-anchor"></a>
 					<h3>requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</h3>
@@ -785,6 +804,9 @@ <h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</s
 							<li class=" tsd-kind-method tsd-parent-kind-class">
 								<a href="defaultbrowserbehavior.html#requirescontextrecreationforaudioworklet" class="tsd-kind-icon">requires<wbr>Context<wbr>Recreation<wbr>For<wbr>Audio<wbr>Worklet</a>
 							</li>
+							<li class=" tsd-kind-method tsd-parent-kind-class">
+								<a href="defaultbrowserbehavior.html#requiresdisablingh264encoding" class="tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding</a>
+							</li>
 							<li class=" tsd-kind-method tsd-parent-kind-class">
 								<a href="defaultbrowserbehavior.html#requiresgroupidmediastreamconstraints" class="tsd-kind-icon">requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</a>
 							</li>

diff --git a/docs/classes/defaultsdp.html b/docs/classes/defaultsdp.html
@@ -116,6 +116,7 @@ <h3>Methods</h3>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#hasvideo" class="tsd-kind-icon">has<wbr>Video</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#lines" class="tsd-kind-icon">lines</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#preferh264ifexists" class="tsd-kind-icon">prefer<wbr>H264<wbr>IfExists</a></li>
+								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#removeh264supportfromsendsection" class="tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#ssrcforvideosendingsection" class="tsd-kind-icon">ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#videosendsectionhasdifferentssrc" class="tsd-kind-icon">video<wbr>Send<wbr>Section<wbr>Has<wbr>DifferentSSRC</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-class"><a href="defaultsdp.html#withaudiomaxaveragebitrate" class="tsd-kind-icon">with<wbr>Audio<wbr>Max<wbr>Average<wbr>Bitrate</a></li>
@@ -357,6 +358,24 @@ <h4 class="tsd-returns-title">Returns <a href="defaultsdp.html" class="tsd-signa
 						</li>
 					</ul>
 				</section>
+				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
+					<a name="removeh264supportfromsendsection" class="tsd-anchor"></a>
+					<h3>remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</h3>
+					<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-class">
+						<li class="tsd-signature tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="defaultsdp.html" class="tsd-signature-type">DefaultSDP</a></li>
+					</ul>
+					<ul class="tsd-descriptions">
+						<li class="tsd-description">
+							<aside class="tsd-sources">
+								<p>Implementation of <a href="../interfaces/sdp.html">SDP</a>.<a href="../interfaces/sdp.html#removeh264supportfromsendsection">removeH264SupportFromSendSection</a></p>
+								<ul>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/sdp/DefaultSDP.ts#L484">src/sdp/DefaultSDP.ts:484</a></li>
+								</ul>
+							</aside>
+							<h4 class="tsd-returns-title">Returns <a href="defaultsdp.html" class="tsd-signature-type">DefaultSDP</a></h4>
+						</li>
+					</ul>
+				</section>
 				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-class">
 					<a name="ssrcforvideosendingsection" class="tsd-anchor"></a>
 					<h3>ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</h3>
@@ -876,6 +895,9 @@ <h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</s
 							<li class=" tsd-kind-method tsd-parent-kind-class">
 								<a href="defaultsdp.html#preferh264ifexists" class="tsd-kind-icon">prefer<wbr>H264<wbr>IfExists</a>
 							</li>
+							<li class=" tsd-kind-method tsd-parent-kind-class">
+								<a href="defaultsdp.html#removeh264supportfromsendsection" class="tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</a>
+							</li>
 							<li class=" tsd-kind-method tsd-parent-kind-class">
 								<a href="defaultsdp.html#ssrcforvideosendingsection" class="tsd-kind-icon">ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</a>
 							</li>

diff --git a/docs/classes/setlocaldescriptiontask.html b/docs/classes/setlocaldescriptiontask.html
@@ -130,7 +130,7 @@ <h3>constructor</h3>
 							<aside class="tsd-sources">
 								<p>Overrides <a href="basetask.html">BaseTask</a>.<a href="basetask.html#constructor">constructor</a></p>
 								<ul>
-									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L14">src/task/SetLocalDescriptionTask.ts:14</a></li>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L15">src/task/SetLocalDescriptionTask.ts:15</a></li>
 								</ul>
 							</aside>
 							<h4 class="tsd-parameters-title">Parameters</h4>
@@ -164,7 +164,7 @@ <h3><span class="tsd-flag ts-flagProtected">Protected</span> task<wbr>Name</h3>
 					<aside class="tsd-sources">
 						<p>Overrides <a href="basetask.html">BaseTask</a>.<a href="basetask.html#taskname">taskName</a></p>
 						<ul>
-							<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L12">src/task/SetLocalDescriptionTask.ts:12</a></li>
+							<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L13">src/task/SetLocalDescriptionTask.ts:13</a></li>
 						</ul>
 					</aside>
 				</section>
@@ -183,7 +183,7 @@ <h3>cancel</h3>
 								<p>Implementation of <a href="../interfaces/task.html">Task</a>.<a href="../interfaces/task.html#cancel">cancel</a></p>
 								<p>Overrides <a href="basetask.html">BaseTask</a>.<a href="basetask.html#cancel">cancel</a></p>
 								<ul>
-									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L20">src/task/SetLocalDescriptionTask.ts:20</a></li>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L21">src/task/SetLocalDescriptionTask.ts:21</a></li>
 								</ul>
 							</aside>
 							<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">void</span></h4>
@@ -287,7 +287,7 @@ <h3>run</h3>
 								<p>Implementation of <a href="../interfaces/task.html">Task</a>.<a href="../interfaces/task.html#run">run</a></p>
 								<p>Overrides <a href="basetask.html">BaseTask</a>.<a href="basetask.html#run">run</a></p>
 								<ul>
-									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L30">src/task/SetLocalDescriptionTask.ts:30</a></li>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/task/SetLocalDescriptionTask.ts#L31">src/task/SetLocalDescriptionTask.ts:31</a></li>
 								</ul>
 							</aside>
 							<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">Promise</span><span class="tsd-signature-symbol">&lt;</span><span class="tsd-signature-type">void</span><span class="tsd-signature-symbol">&gt;</span></h4>

diff --git a/docs/interfaces/extendedbrowserbehavior.html b/docs/interfaces/extendedbrowserbehavior.html
@@ -114,6 +114,7 @@ <h3>Methods</h3>
 								<li class="tsd-kind-method tsd-parent-kind-interface tsd-is-inherited"><a href="extendedbrowserbehavior.html#requiresbundlepolicy" class="tsd-kind-icon">requires<wbr>Bundle<wbr>Policy</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface tsd-is-inherited"><a href="extendedbrowserbehavior.html#requirescheckforsdpconnectionattributes" class="tsd-kind-icon">requires<wbr>Check<wbr>For<wbr>Sdp<wbr>Connection<wbr>Attributes</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface tsd-is-overwrite"><a href="extendedbrowserbehavior.html#requirescontextrecreationforaudioworklet" class="tsd-kind-icon">requires<wbr>Context<wbr>Recreation<wbr>For<wbr>Audio<wbr>Worklet</a></li>
+								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="extendedbrowserbehavior.html#requiresdisablingh264encoding" class="tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="extendedbrowserbehavior.html#requiresgroupidmediastreamconstraints" class="tsd-kind-icon">requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface tsd-is-inherited"><a href="extendedbrowserbehavior.html#requiresicecandidategatheringtimeoutworkaround" class="tsd-kind-icon">requires<wbr>Ice<wbr>Candidate<wbr>Gathering<wbr>Timeout<wbr>Workaround</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface tsd-is-inherited"><a href="extendedbrowserbehavior.html#requiresnoexactmediastreamconstraints" class="tsd-kind-icon">requires<wbr>NoExact<wbr>Media<wbr>Stream<wbr>Constraints</a></li>
@@ -351,6 +352,23 @@ <h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</
 						</li>
 					</ul>
 				</section>
+				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
+					<a name="requiresdisablingh264encoding" class="tsd-anchor"></a>
+					<h3>requires<wbr>Disabling<wbr>H264<wbr>Encoding</h3>
+					<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
+						<li class="tsd-signature tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><span class="tsd-signature-type">boolean</span></li>
+					</ul>
+					<ul class="tsd-descriptions">
+						<li class="tsd-description">
+							<aside class="tsd-sources">
+								<ul>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/browserbehavior/ExtendedBrowserBehavior.ts#L22">src/browserbehavior/ExtendedBrowserBehavior.ts:22</a></li>
+								</ul>
+							</aside>
+							<h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">boolean</span></h4>
+						</li>
+					</ul>
+				</section>
 				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
 					<a name="requiresgroupidmediastreamconstraints" class="tsd-anchor"></a>
 					<h3>requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</h3>
@@ -780,6 +798,9 @@ <h4 class="tsd-returns-title">Returns <span class="tsd-signature-type">string</s
 							<li class=" tsd-kind-method tsd-parent-kind-interface tsd-is-overwrite">
 								<a href="extendedbrowserbehavior.html#requirescontextrecreationforaudioworklet" class="tsd-kind-icon">requires<wbr>Context<wbr>Recreation<wbr>For<wbr>Audio<wbr>Worklet</a>
 							</li>
+							<li class=" tsd-kind-method tsd-parent-kind-interface">
+								<a href="extendedbrowserbehavior.html#requiresdisablingh264encoding" class="tsd-kind-icon">requires<wbr>Disabling<wbr>H264<wbr>Encoding</a>
+							</li>
 							<li class=" tsd-kind-method tsd-parent-kind-interface">
 								<a href="extendedbrowserbehavior.html#requiresgroupidmediastreamconstraints" class="tsd-kind-icon">requires<wbr>Group<wbr>IdMedia<wbr>Stream<wbr>Constraints</a>
 							</li>

diff --git a/docs/interfaces/sdp.html b/docs/interfaces/sdp.html
@@ -100,6 +100,7 @@ <h3>Methods</h3>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#hascandidatesforallmlines" class="tsd-kind-icon">has<wbr>Candidates<wbr>For<wbr>AllMLines</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#lines" class="tsd-kind-icon">lines</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#preferh264ifexists" class="tsd-kind-icon">prefer<wbr>H264<wbr>IfExists</a></li>
+								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#removeh264supportfromsendsection" class="tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#ssrcforvideosendingsection" class="tsd-kind-icon">ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#videosendsectionhasdifferentssrc" class="tsd-kind-icon">video<wbr>Send<wbr>Section<wbr>Has<wbr>DifferentSSRC</a></li>
 								<li class="tsd-kind-method tsd-parent-kind-interface"><a href="sdp.html#withaudiomaxaveragebitrate" class="tsd-kind-icon">with<wbr>Audio<wbr>Max<wbr>Average<wbr>Bitrate</a></li>
@@ -253,6 +254,28 @@ <h4 class="tsd-returns-title">Returns <a href="sdp.html" class="tsd-signature-ty
 						</li>
 					</ul>
 				</section>
+				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
+					<a name="removeh264supportfromsendsection" class="tsd-anchor"></a>
+					<h3>remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</h3>
+					<ul class="tsd-signatures tsd-kind-method tsd-parent-kind-interface">
+						<li class="tsd-signature tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section<span class="tsd-signature-symbol">(</span><span class="tsd-signature-symbol">)</span><span class="tsd-signature-symbol">: </span><a href="sdp.html" class="tsd-signature-type">SDP</a></li>
+					</ul>
+					<ul class="tsd-descriptions">
+						<li class="tsd-description">
+							<aside class="tsd-sources">
+								<ul>
+									<li>Defined in <a href="https://github.com/aws/amazon-chime-sdk-js/blob/master/src/sdp/SDP.ts#L86">src/sdp/SDP.ts:86</a></li>
+								</ul>
+							</aside>
+							<div class="tsd-comment tsd-typography">
+								<div class="lead">
+									<p>Removes H.264 from the send section.</p>
+								</div>
+							</div>
+							<h4 class="tsd-returns-title">Returns <a href="sdp.html" class="tsd-signature-type">SDP</a></h4>
+						</li>
+					</ul>
+				</section>
 				<section class="tsd-panel tsd-member tsd-kind-method tsd-parent-kind-interface">
 					<a name="ssrcforvideosendingsection" class="tsd-anchor"></a>
 					<h3>ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</h3>
@@ -493,6 +516,9 @@ <h4 class="tsd-returns-title">Returns <a href="sdp.html" class="tsd-signature-ty
 							<li class=" tsd-kind-method tsd-parent-kind-interface">
 								<a href="sdp.html#preferh264ifexists" class="tsd-kind-icon">prefer<wbr>H264<wbr>IfExists</a>
 							</li>
+							<li class=" tsd-kind-method tsd-parent-kind-interface">
+								<a href="sdp.html#removeh264supportfromsendsection" class="tsd-kind-icon">remove<wbr>H264<wbr>Support<wbr>From<wbr>Send<wbr>Section</a>
+							</li>
 							<li class=" tsd-kind-method tsd-parent-kind-interface">
 								<a href="sdp.html#ssrcforvideosendingsection" class="tsd-kind-icon">ssrc<wbr>For<wbr>Video<wbr>Sending<wbr>Section</a>
 							</li>

diff --git a/src/browserbehavior/DefaultBrowserBehavior.ts b/src/browserbehavior/DefaultBrowserBehavior.ts
@@ -278,10 +278,24 @@ export default class DefaultBrowserBehavior implements BrowserBehavior, Extended
     return this.isAndroid();
   }
 
+  requiresDisablingH264Encoding(): boolean {
+    return (
+      (this.isIOSSafari() && this.version() === '15.1.0') ||
+      ((this.isIOSChrome() || this.isIOSFirefox()) && /( OS 15_1 )/i.test(navigator.userAgent))
+    );
+  }
+
   // These helpers should be kept private to encourage
   // feature detection instead of browser detection.
   private isIOSSafari(): boolean {
-    return this.browser.name === 'ios' || this.browser.name === 'ios-webview';
+    return (
+      this.browser.name === 'ios' ||
+      this.browser.name === 'ios-webview' ||
+      (this.browser.name === 'safari' &&
+        /( Mac )/i.test(navigator.userAgent) &&
+        !!navigator.maxTouchPoints &&
+        navigator.maxTouchPoints > 1) //Ipad
+    );
   }
 
   private isSafari(): boolean {

diff --git a/src/browserbehavior/ExtendedBrowserBehavior.ts b/src/browserbehavior/ExtendedBrowserBehavior.ts
@@ -19,4 +19,5 @@ export default interface ExtendedBrowserBehavior extends BrowserBehavior {
   isSimulcastSupported(): boolean;
   supportsBackgroundFilter(): boolean;
   disableResolutionScaleDown(): boolean;
+  requiresDisablingH264Encoding(): boolean;
 }