I create a camera extension and App can push video data to camera extension with sinkStream. I want to monitor the number of clients connected to the camera extension and close the app's push stream when the number of connected client is zero.

Hello, My app used camera extension to implement virtual camera. After cosigned with Developer ID Application, My app can run on other mac. But can't run on MacOS 10.15. Print system log as follows: Aug 22 16:08:11 YL1150-C01177PG com.apple.xpc.launchd[1] (com.apple.xpc.launchd.oneshot.0x10000060.Presentation Assistant[95558]): Binary is improperly signed. Aug 22 16:08:20 YL1150-C01177PG com.apple.xpc.launchd[1] (com.yealink.PresentationAssistant.app.4612[95559]): removing service since it exited with consistent failure - OS_REASON_CODESIGNING | When validating /Applications/Presentation Assistant.app/Contents/MacOS/Presentation Assistant: Code has restricted entitlements, but the validation of its code signature failed. Unsatisfied Entitlements: Aug 22 16:08:20 YL1150-C01177PG com.apple.xpc.launchd[1] (com.yealink.PresentationAssistant.app.4612[95559]): Binary is improperly signed. Aug 22 16:08:51 YL1150-C01177PG com.apple.xpc.launchd[1] (com.apple.mdworker.shared.04000000-0700-0000-0000-000000000000[95551]): Service exited due to SIGKILL | sent by mds[114] My app entitlements is: ??qq?<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd"> <plist version="1.0"> <dict> <key>com.apple.security.app-sandbox</key> <false/> <key>com.apple.security.application-groups</key> <array> <string>xxxxx.com.yealink.PresentationAssistant.app</string> </array> <key>com.apple.security.network.client</key> <true/> <key>com.apple.security.network.server</key> <true/> <key>com.apple.security.device.microphone</key> <true/> <key>com.apple.security.device.camera</key> <true/> <key>com.apple.security.device.usb</key> <true/> <key>com.apple.security.device.bluetooth</key> <true/> <key>com.apple.security.device.print</key> <true/> <key>com.apple.security.device.audio-input</key> <true/> <key>com.apple.security.files.user-selected.read-write</key> <true/> <key>com.apple.security.assets.pictures.read-write</key> <true/> <key>com.apple.security.files.downloads.read-write</key> <true/> <key>com.apple.security.assets.music.read-write</key> <true/> <key>com.apple.security.assets.movies.read-write</key> <true/> <key>com.apple.security.files.all</key> <true/> <key>com.apple.security.files.bookmarks.app-scope</key> <true/> <key>com.apple.security.cs.allow-unsigned-executable-memory</key> <true/> <key>com.apple.security.cs.allow-jit</key> <true/> <key>com.apple.security.cs.disable-executable-page-protection</key> <true/> <key>com.apple.security.cs.disable-library-validation</key> <true/> <key>com.apple.security.cs.allow-dyld-environment-variables</key> <true/> <key>com.apple.security.automation.apple-events</key> <true/> <key>com.apple.developer.system-extension.install</key> <true/> </dict> </plist> I found that it works on macos 10.15 as long as I remove system-extension.install. What should I do?

Hello, I referred to the official camera extension example at https://developer.apple.com/documentation/coremediaio/creating_a_camera_extension_with_core_media_i_o?language=objc. I'm using CMake to build the camera extension plugin and integrate it into a Qt CMake project. When installing the system extension file, I receive a failure prompt with the following message: Error Domain=OSSystemExtensionErrorDomain Code=8 "Invalid code signature or missing entitlements" UserInfo={NSLocalizedDescription=Invalid code signature or missing entitlements} Here are the entitlements files for the camera extension: &lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt; &lt;!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\"&gt; &lt;plist version=\"1.0\"&gt; &lt;dict&gt; &lt;key&gt;com.apple.security.app-sandbox&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.application-groups&lt;/key&gt; &lt;array&gt; &lt;string&gt;com.yealink.meeting.app&lt;/string&gt; &lt;/array&gt; &lt;/dict&gt; &lt;/plist&gt; The info.List.in file for the camera extension: &lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt; &lt;!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\"&gt; &lt;plist version=\"1.0\"&gt; &lt;dict&gt; &lt;key&gt;CMIOExtension&lt;/key&gt; &lt;dict&gt; &lt;key&gt;CMIOExtensionMachServiceName&lt;/key&gt; &lt;string&gt;$(TeamIdentifierPrefix)$(PRODUCT_BUNDLE_IDENTIFIER)&lt;/string&gt; &lt;/dict&gt; &lt;/dict&gt; &lt;/plist&gt; And the entitlements file for the app: &lt;?xml version=\"1.0\" encoding=\"UTF-8\"?&gt; &lt;!DOCTYPE plist PUBLIC \"-//Apple//DTD PLIST 1.0//EN\" \"http://www.apple.com/DTDs/PropertyList-1.0.dtd\"&gt; &lt;plist version=\"1.0\"&gt; &lt;dict&gt; &lt;key&gt;com.apple.developer.system-extension.install&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.app-sandbox&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.application-groups&lt;/key&gt; &lt;array&gt; &lt;string&gt;com.yealink.meeting.app&lt;/string&gt; &lt;/array&gt; &lt;key&gt;com.apple.security.device.camera&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.device.microphone&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.device.usb&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.network.client&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.network.server&lt;/key&gt; &lt;true/&gt; &lt;key&gt;com.apple.security.personal-information.location&lt;/key&gt; &lt;true/&gt; &lt;/dict&gt; &lt;/plist&gt; I'm looking forward to your response.

How to add multiple resolutions to CMIO camera extension