diff --git a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-java.ditamap b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-java.ditamap
index bf21e6b0852..c04530f5b99 100644
--- a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-java.ditamap
+++ b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-java.ditamap
@@ -317,14 +317,14 @@
- preloadChannel[1/2]
+ preloadChannel [1/2]
- preloadChannel[2/2]
+ preloadChannel [2/2]
diff --git a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
index e3452a90df7..6a1bdafb3cf 100644
--- a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
+++ b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-macos.ditamap
@@ -11664,7 +11664,7 @@
- Class 及 Enum
+ Class and Enum
diff --git a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-unity.ditamap b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-unity.ditamap
index d4c8a27e8b7..6cab8793acc 100644
--- a/en-US/dita/RTC-NG/config/keys-rtc-ng-api-unity.ditamap
+++ b/en-US/dita/RTC-NG/config/keys-rtc-ng-api-unity.ditamap
@@ -368,14 +368,14 @@
- PreloadChannel[1/2]
+ PreloadChannel [1/2]
- PreloadChannel[2/2]
+ PreloadChannel [2/2]
diff --git a/markdown/RTC 4.x/release-notes/en-US/framework/release_bluerprint_ng.md b/markdown/RTC 4.x/release-notes/en-US/framework/release_bluerprint_ng.md
index 2c347cd036e..b72e77b3780 100644
--- a/markdown/RTC 4.x/release-notes/en-US/framework/release_bluerprint_ng.md
+++ b/markdown/RTC 4.x/release-notes/en-US/framework/release_bluerprint_ng.md
@@ -1,10 +1,9 @@
-## v4.2.1 Beta
+## v4.2.1
-v4.2.1 Beta was released on July xx, 2023.
+v4.2.1 was released on October xx, 2023.
This is the first release of Video SDK for Unreal Blueprint.
-
**Features**
@@ -12,8 +11,6 @@ Video SDK for Unreal Blueprint provides a simple and user-friendly real-time int
Video SDK for Unreal Blueprint offers a visual interface and a set of intuitive and easy-to-use nodes. This enables developers to effortlessly implement real-time interactive features in games or apps within the Unreal project. You don't need to know C++, just drag, connect and configure nodes.
-Agora provides the open source [example project](https://github.com/AgoraIO-Extensions/Agora-Unreal-RTC-SDK/tree/main/Agora-Unreal-SDK-Blueprint-Example) on GitHub for your reference.
-
**Reference**
To integrate real-time engagement functionality into your app using Video SDK for Unreal Engine, see:
@@ -24,3 +21,4 @@ To integrate real-time engagement functionality into your app using Video SDK fo
- [Get Started with Interactive Live Streaming Standard]()
- [API Reference]()
+Agora provides the open source [example project](https://github.com/AgoraIO-Extensions/Agora-Unreal-RTC-SDK/tree/main/Agora-Unreal-SDK-CPP-Example) on GitHub for your reference.
diff --git a/markdown/RTC 4.x/release-notes/en-US/framework/release_unreal_ng.md b/markdown/RTC 4.x/release-notes/en-US/framework/release_unreal_ng.md
index b6afe849647..8576a417834 100644
--- a/markdown/RTC 4.x/release-notes/en-US/framework/release_unreal_ng.md
+++ b/markdown/RTC 4.x/release-notes/en-US/framework/release_unreal_ng.md
@@ -1,445 +1,20 @@
-## v4.2.1 Beta
+## v4.2.1
-This version was released on August xx, 2023.
-#### Compatibility changes
+This version was released on October xx, 2023.
-If you use the features mentioned in this section, ensure that you modify the implementation of the relevant features after upgrading the SDK.
+**Compatibility changes**
-If you have already integrated the 3.x version of the SDK and wish to upgrade to this version, please refer to [Migration Guide]() for upgrade instructions.
+If you have already integrated the 3.x version of the SDK and wish to upgrade to this version, please refer to [Migration Guide](https://github.com/AgoraIO-Extensions/Agora-Unreal-RTC-SDK/blob/main/Migration%20Guide.md) for upgrade instructions.
-**1. Video capture (Windows, iOS)**
-This release optimizes the APIs for camera and screen capture function. As of v4.2.1, ensure you use the alternative methods listed in the table below and specify the video source by setting the `sourceType` parameter.
+**Reference**
-| Deleted methods | Alternative methods |
-|:---------|:--------|
-| `startPrimaryCameraCapture` (Windows)`startSecondaryCameraCapture` (Windows, iOS) | `startCameraCapture` |
-| `stopPrimaryCameraCapture` (Windows)`stopSecondaryCameraCapture` (Windows, iOS) | `stopCameraCapture` |
-| `startPrimaryScreenCapture` (Windows)`startSecondaryScreenCapture` (Windows) | `startScreenCaptureBySourceType` (Windows) |
-| `stopPrimaryScreenCapture` (Windows)`stopSecondaryScreenCapture` (Windows) | `stopScreenCaptureBySourceType` (Windows) |
+To integrate real-time engagement functionality into your app using Agora SDK for Unreal Engine, see:
-**2. Video data acquisition**
+- [Get Started with Voice Calling]()
+- [Get Started with Video Calling]()
+- [Get Started with Interactive Live Streaming Premium]()
+- [Get Started with Interactive Live Streaming Standard]()
+- [API Reference]()
-- The `onCaptureVideoFrame` and `onPreEncodeVideoFrame` callbacks are added with a new parameter called `sourceType`, which is used to indicate the specific video source type.
-
-- The following callbacks are deleted. Get the video source type through the `sourceType` parameter in the `onPreEncodeVideoFrame` and `onCaptureVideoFrame` callbacks. (Windows)
- - `onSecondaryPreEncodeCameraVideoFrame`
- - `onScreenCaptureVideoFrame`
- - `onPreEncodeScreenVideoFrame`
- - `onSecondaryPreEncodeScreenVideoFrame`
-
-**3. Channel media options**
-
-- `publishCustomAudioTrackEnableAec` in `ChannelMediaOptions` is deleted. Use `publishCustomAudioTrack` instead.
-- `publishTrancodedVideoTrack` in `ChannelMediaOptions` is renamed to `publishTranscodedVideoTrack`.
-- `publishCustomAudioSourceId` in `ChannelMediaOptions` is renamed to `publishCustomAudioTrackId`.
-
-**4. Local video mixing (Windows)**
-
-- The `VideoInputStreams` in `LocalTranscoderConfiguration` is changed to `videoInputStreams`.
-- The `MediaSourceType` in `TranscodingVideoStream` is changed to `VideoSourceType`.
-
-**5. Video encoder algorithm**
-
-As of this release, the SDK optimizes the video encoder algorithm and upgrades the default video encoding resolution from 640 × 360 to 960 × 540 to accommodate improvements in device performance and network bandwidth, providing users with a full-link HD experience in various audio and video interaction scenarios.
-
-Call the `setVideoEncoderConfiguration` method to set the expected video encoding resolution in the video encoding parameters configuration.
-
-The increase in the default resolution affects the aggregate resolution and thus the billing rate. See [Pricing](https://docs.agora.io/en/video-calling/reference/pricing).
-
-**6. Miscellaneous**
-
-- `onApiCallExecuted` is deleted. Agora recommends getting the results of the API implementation through relevant channels and media callbacks.
-- The `IAudioFrameObserver` class is renamed to `IAudioPcmFrameSink`, thus the prototype of the following methods are updated accordingly:
- - `onFrame`
- - `registerAudioFrameObserver` and `unregisterAudioFrameObserver` in `MediaPlayer`
-- `startChannelMediaRelay`, `updateChannelMediaRelay`, `startChannelMediaRelayEx` and `updateChannelMediaRelayEx` are deprecated. Use `startOrUpdateChannelMediaRelay` and `startOrUpdateChannelMediaRelayEx` instead.
-
-#### New features
-
-**1. AI noise reduction**
-
-This release introduces the AI noise reduction function. Once enabled, the SDK automatically detects and reduces background noises. Whether in bustling public venues or real-time competitive arenas that demand lightning-fast responsiveness, this function guarantees optimal audio clarity, providing users with an elevated audio experience. You can enable this function through the newly-introduced `setAINSMode` method and set the noise reduction mode as balance, aggressive or low latency according to your scenarios.
-
-**2. Enhanced virtual background**
-
-To increase the fun of real-time video calls and protect user privacy, this version has enhanced the virtual background feature. You can now set custom backgrounds of various types by calling the `enableVirtualBackground` method, including:
-
-- Process the background as alpha information without replacement, only separating the portrait and the background. This can be combined with the local video mixing feature to achieve a portrait-in-picture effect.
-- Replace the background with various formats of local videos.
-
-**3. Video scenario settings**
-
-This release introduces `setVideoScenario` for setting the video application scene. The SDK will automatically enable the best practice strategy based on different scenes, adjusting key performance indicators to optimize video quality and improve user experience. Whether it is a formal business meeting or a casual online gathering, this feature ensures that the video quality meets the requirements.
-
-Currently, this feature provides targeted optimizations for real-time video conferencing scenarios, including:
-
-- Automatically activate multiple anti-weak network technologies to enhance the capability and performance of low-quality video streams in meeting scenarios where high bitrate are required, ensuring smoothness when multiple streams are subscribed by the receiving end.
-- Monitor the number of subscribers for the high-quality and low-quality video streams in real time, dynamically adjusting the configuration of the high-quality stream and dynamically enabling or disabling the low-quality stream, to save uplink bandwidth and consumption.
-
-**4. Local video mixing (macOS, iOS, Android)**
-
-This release adds the local video mixing feature. You can use the `startLocalVideoTranscoder` method to mix and render multiple video streams locally, such as camera-captured video, screen sharing streams, video files, images, etc. This allows you to achieve custom layouts and effects, making it easy to create personalized video display effects to meet various scenario requirements, such as remote meetings, live streaming, online education, while also supporting features like portrait-in-picture effect.
-
-Additionally, the SDK provides the `updateLocalTranscoderConfiguration` method and the `onLocalVideoTranscoderError` callback. After enabling local video mixing, you can use the `updateLocalTranscoderConfiguration` method to update the video mixing configuration. Where an error occurs in starting the local video mixing or updating the configuration, you can get the reason for the failure through the `onLocalVideoTranscoderError` callback.
-
-Local video mixing requires more CPU resources. Therefore, Agora recommends enabling this function on devices with higher performance.
-
-**5. Local video mixing (Windows)**
-
-This release adds the `onLocalVideoTranscoderError` callback. When there is an error in starting or updating the local video mixing, the SDK triggers this callback to report the reason for the failure.
-
-**6. Cross-device synchronization**
-
-In real-time collaborative singing scenarios, network issues can cause inconsistencies in the downlinks of different client devices. To address this, this release introduces `getNtpWallTimeInMs` for obtaining the current Network Time Protocol (NTP) time. By using this method to synchronize lyrics and music across multiple client devices, users can achieve synchronized singing and lyrics progression, resulting in a better collaborative experience.
-
-**7. Instant frame rendering**
-
-This release adds the `enableInstantMediaRendering` method to enable instant rendering mode for audio and video frames, which can speed up the first video or audio frame rendering after the user joins the channel.
-
-**8. Video rendering tracing**
-
-This release adds the `startMediaRenderingTracing` and `startMediaRenderingTracingEx` methods. The SDK starts tracing the rendering status of the video frames in the channel from the moment this method is called and reports information about the event through the `onVideoRenderingTracingResult` callback.
-
-Agora recommends that you use this method in conjunction with the UI settings, such as buttons and sliders, in your app. For example, call this method when the user clicks **Join Channel** button and then get the indicators in the video frame rendering process through the `onVideoRenderingTracingResult` callback. This enables developers to optimize the indicators and improve the user experience.
-
-#### Improvements
-
-**1. Voice changer**
-
-This release introduces the `setLocalVoiceFormant` method that allows you to adjust the formant ratio to change the timbre of the voice. This method can be used together with the `setLocalVoicePitch` method to adjust the pitch and timbre of voice at the same time, enabling a wider range of voice transformation effects.
-
-**2. Enhanced screen share (Android, iOS)**
-
-This release adds the `queryScreenCaptureCapability` method, which is used to query the screen capture capabilities of the current device. To ensure optimal screen sharing performance, particularly in enabling high frame rates like 60 fps, Agora recommends you to query the device's maximum supported frame rate using this method beforehand.
-
-This release also adds the `setScreenCaptureScenario` method, which is used to set the scenario type for screen sharing. The SDK automatically adjusts the smoothness and clarity of the shared screen based on the scenario type you set.
-
-**3. Improved compatibility with audio file types (Android)**
-
-As of this release, you can use the following methods to open files with a URI starting with `content://` : `startAudioMixing`, `playEffect`, and `openWithMediaSource`.
-
-**4. Enhanced rendering compatibility (Windows)**
-
-This release enhances the rendering compatibility of the SDK. Issues like black screens caused by rendering failures on certain devices are fixed.
-
-**5. Audio and video synchronization**
-
-For custom video and audio capture scenarios, this release introduces `getCurrentMonotonicTimeInMs` for obtaining the current Monotonic Time. By passing this value into the timestamps of audio and video frames, developers can accurately control the timing of their audio and video streams, ensuring proper synchronization.
-
-**6. Multi-camera capture and multi-screen capture**
-
-This release introduces `startScreenCaptureBySourceType` (PC only) and `startCameraCapture`. By calling these methods multiple times and specifying the `sourceType` parameter, developers can start capturing video streams from multiple cameras and screens for local video mixing or multi-channel publishing. This is particularly useful for scenarios such as remote medical care and online education, where multiple cameras and displays need to be connected.
-
-**7. Channel media relay**
-
-This release introduces `startOrUpdateChannelMediaRelay` and `startOrUpdateChannelMediaRelayEx`, allowing for a simpler and smoother way to start and update media relay across channels. With these methods, developers can easily start the media relay across channels and update the target channels for media relay with a single method. Additionally, the internal interaction frequency has been optimized, effectively reducing latency in function calls.
-
-**8. Custom audio tracks**
-
-To better meet the needs of custom audio capture scenarios, this release adds `createCustomAudioTrack` and `destroyCustomAudioTrack` for creating and destroying custom audio tracks. Two types of audio tracks are also provided for users to choose from, further improving the flexibility of capturing external audio source:
-
-- Mixable audio track: Supports mixing multiple external audio sources and publishing them to the same channel, suitable for multi-channel audio capture scenarios.
-- Direct audio track: Only supports publishing one external audio source to a single channel, suitable for low-latency audio capture scenarios.
-
-**9. Video frame observer**
-
-As of this release, the SDK optimizes the `onRenderVideoFrame` callback, and the meaning of the return value is different depending on the video processing mode:
-
-- When the video processing mode is `processModeReadOnly`, the return value is reserved for future use.
-- When the video processing mode is `processModeReadWrite`, the SDK receives the video frame when the return value is `true`. The video frame is discarded when the return value is `false`.
-
-**Miscellaneous**
-
-This version improves the network transmission strategy, enhancing the smoothness of audio and video interactions.
-#### Issues fixed
-
-This release fixed the following issues:
-
-- Occasional crashes occur on Android devices when users joining or leaving a channel. (Android)
-- When the host frequently switching the user role between broadcaster and audience in a short period of time, the audience members cannot hear the audio of the host.
-- Occasional failure when enabling in-ear monitoring. (Android)
-- Occasional loss of the `onFirstRemoteVideoFrame` callback during channel media relay. (iOS)
-- The receiver actively subscribed to the high-quality stream but unexpectedly received a low-quality stream. (iOS)
-- The receiver was receiving the low-quality stream originally, and automatically switched to high-quality stream after a few seconds. (macOS)
-- Occasional echo. (Android)
-- Occasional screen jittering during screen sharing. (macOS)
-- Abnormal client status cased by an exception in the `onRemoteAudioStateChanged` callback. (Android, iOS)
-- When using Agora Media Player to play RTSP video streams, the video images sometimes appeared pixelated. (Windows)
-- Playing audio files with a sample rate of 48 kHz failed.
-- Crashes occurred after users set the video resolution as 3840 × 2160 and started CDN streaming on Xiaomi Redmi 9A devices. (Android)
-- If the rendering view of the player was set as a `UIViewController`'s view, the video was zoomed from the bottom-left corner to the middle of the screen when entering full-screen mode. (macOS)
-- Adding an alpha channel to an image in PNG or GIF format failed when the local client mixed video streams. (Windows)
-- In real-time chorus scenarios, remote users heard noises and echoes when an OPPO R11 device joined the channel in loudspeaker mode. (Android)
-- When the playback of the local music finished, the `onAudioMixingFinished` callback was not properly triggered. (Android)
-- After joining the channel, remotes users saw a watermark even though the watermark was deleted. (Windows)
-- If a watermark was added after starting screen sharing, the watermark did not display the screen. (Windows)
-- When joining a channel and accessing an external camera, calling `setDevice` to specify the video capture device as the external camera did not take effect. (macOS, Windows)
-- When using a video frame observer, the first video frame was occasionally missed on the receiver's end. (Android)
-- When sharing screens in scenarios involving multiple channels, remote users occasionally saw black screens. (Android)
-- When trying to outline the shared window and put it on top, the shared window did not stay on top of other windows. (Windows)
-- Switching to the rear camera with the virtual background enabled occasionally caused the background to be inverted. (Android)
-- When there were multiple video streams in a channel, calling some video enhancement APIs occasionally failed.
-- At the moment when a user left a channel, a request for leaving was not sent to the server and the leaving behavior was incorrectly determined by the server as timed out.
-
-#### API changes
-
-**Added**
-
-- `startCameraCapture`
-- `stopCameraCapture`
-- `startScreenCaptureBySourceType` (Windows, macOS)
-- `stopScreenCaptureBySourceType` (Windows, macOS)
-- `startOrUpdateChannelMediaRelay`
-- `startOrUpdateChannelMediaRelayEx`
-- `getNtpWallTimeInMs`
-- `setVideoScenario`
-- `getCurrentMonotonicTimeInMs`
-- `onLocalVideoTranscoderError`
-- `startLocalVideoTranscoder` (macOS, iOS, Android)
-- `updateLocalTranscoderConfiguration` (macOS, iOS, Android)
-- `queryScreenCaptureCapability` (iOS, Android)
-- `setScreenCaptureScenario` (iOS, Android)
-- `setAINSMode`
-- `createCustomAudioTrack`
-- `destroyCustomAudioTrack`
-- `AudioTrackConfig`
-- `AudioAinsMode`
-- `AudioTrackType`
-- `VideoApplicationScenarioType`
-- `ScreenCaptureFramerateCapability`
-- The `domainLimit` and `autoRegisterAgoraExtensions` members in `RtcEngineContext`
-- The `sourceType` parameter in `onCaptureVideoFrame` and `onPreEncodeVideoFrame` callbacks
-- The `backgroundNone` and `backgroundVideo` enumerators in `backgroundSourceType`
-
-**Deprecated**
-
-- `startChannelMediaRelay`
-- `startChannelMediaRelayEx`
-- `updateChannelMediaRelay`
-- `updateChannelMediaRelayEx`
-- `onChannelMediaRelayEvent`
-- `ChannelMediaRelayEvent`
-- `enableInstantMediaRendering`
-- `startMediaRenderingTracing`
-- `startMediaRenderingTracingEx`
-- `onVideoRenderingTracingResult`
-- `MediaTraceEvent`
-- `VideoRenderingTracingInfo`
-
-**Deleted**
-
-- `startPrimaryScreenCapture` (Windows)
-- `startSecondaryScreenCapture` (Windows)
-- `stopPrimaryScreenCapture` (Windows)
-- `stopSecondaryScreenCapture` (Window)
-- `startPrimaryCameraCapture` (Windows)
-- `startSecondaryCameraCapture` (Windows, iOS)
-- `stopPrimaryCameraCapture` (Windows)
-- `stopSecondaryCameraCapture` (Windows, iOS)
-- `onSecondaryPreEncodeCameraVideoFrame` (Windows)
-- `onScreenCaptureVideoFrame`
-- `onPreEncodeScreenVideoFrame`
-- `onSecondaryPreEncodeScreenVideoFrame` (Windows)
-- `onApiCallExecuted`
-- `publishCustomAudioTrackEnableAec` in `ChannelMediaOptions` in `ChannelMediaOptions`
-- `enableRemoteSuperResolution`
-- `superResolutionType` in `RemoteVideoStats`
-## v4.1.0
-
-v4.1.0 was released on January 17, 2023.
-
-
-This release is the first version of RTC Unreal SDK, including the following features:
-
-**1. Multiple media tracks**
-
-This release supports one `IRtcEngine` instance to collect multiple audio and video sources at the same time and publish them to the remote users by setting `RtcEngineEx` and `ChannelMediaOptions.`
-
-- After calling `joinChannel` to join the first channel, call `joinChannelEx` multiple times to join multiple channels, and publish the specified stream to different channels through different user ID (`localUid`) and `ChannelMediaOptions` settings.
-- You can simultaneously publish multiple sets of video streams captured by multiple cameras or screen sharing by setting `publishSecondaryCameraTrack` and `publishSecondaryScreenTrack` in `ChannelMediaOptions`.
-
-This release adds `createCustomVideoTrack` method to implement video custom capture. You can refer to the following steps to publish multiple custom captured video in the channel:
-
-1. Create a custom video track: Call this method to create a video track, and get the video track ID.
-2. Set the custom video track to be published in the channel: In each channel's `ChannelMediaOptions`, set the `customVideoTrackId` parameter to the ID of the video track you want to publish, and set `publishCustomVideoTrack` to `true`.
-3. Pushing an external video source: Call `pushVideoFrame`, and specify `videoTrackId` as the ID of the custom video track in step 2 in order to publish the corresponding custom video source in multiple channels.
-
-You can also experience the following features with the multi-channel capability:
-
-- Publish multiple sets of audio and video streams to the remote users through different user IDs (`uid`).
-- Mix multiple audio streams and publish to the remote users through a user ID (`uid`).
-- Combine multiple video streams and publish them to the remote users through a user ID (`uid`).
-
-**2. Ultra HD resolution (Beta)**
-
-In order to improve the interactive video experience, the SDK optimizes the whole process of video capture, encoding, decoding and rendering, and now supports 4K resolution. The improved FEC (Forward Error Correction) algorithm enables adaptive switches according to the frame rate and number of video frame packets, which further reduces the video stuttering rate in 4K scenes.
-
-Additionally, you can set the encoding resolution to 4K (3840 × 2160) and the frame rate to 60 fps when calling `SetVideoEncoderConfiguration`. The SDK supports automatic fallback to the appropriate resolution and frame rate if your device does not support 4K.
-
-This feature has certain requirements with regards to device performance and network bandwidth, and the supported upstream and downstream frame rates vary on different platforms. To experience this feature, contact
technical support.
The SDK automatically selects the best video format for the video capture device based on your settings in VideoEncoderConfiguration, so normally you should not need to use these new methods.
-
-**16. In-ear monitoring**
-
-
-This release adds support for in-ear monitoring. You can call `enableInEarMonitoring` to enable the in-ear monitoring function.
-
-After successfully enabling the in-ear monitoring function, you can call `registerAudioFrameObserver` to register the audio observer, and the SDK triggers the `onEarMonitoringAudioFrame` callback to report the audio frame data. You can use your own audio effect processing module to pre-process the audio frame data of the in-ear monitoring to implement custom audio effects. Agora recommends that you choose one of the following two methods to set the audio data format of the in-ear monitoring:
-
-- Call the `setEarMonitoringAudioFrameParameters` method to set the audio data format of in-ear monitoring. The SDK calculates the sampling interval based on the parameters in this method, and triggers the `onEarMonitoringAudioFrame` callback based on the sampling interval.
-- Set the audio data format in the return value of the `getEarMonitoringAudioParams` callback. The SDK calculates the sampling interval based on the return value of the callback, and triggers the onEarMonitoringAudioFrame callback based on the sampling interval.
-
- To adjust the in-ear monitoring volume, you can call setInEarMonitoringVolume.
-
-
-**17. Audio stream filter**
-
-This release introduces filtering audio streams based on volume. Once this function is enabled, the Agora server ranks all audio streams by volume and transports 3 audio streams with the highest volumes to the receivers by default. The number of audio streams to be transported can be adjusted; you can contact support@agora.io to adjust this number according to your scenarios.
-
-Meanwhile, Agora supports publishers to choose whether or not the audio streams being published are to be filtered based on volume. Streams that are not filtered will bypass this filter mechanism and transported directly to the receivers. In scenarios where there are a number of publishers, enabling this function helps reducing the bandwidth and device system pressure for the receivers.
-
-
-
-
-**18. MPUDP (MultiPath UDP) (Beta)**
-
-As of this release, the SDK supports MPUDP protocol, which enables you to connect and use multiple paths to maximize the use of channel resources based on the UDP protocol. You can use different physical NICs on both mobile and desktop and aggregate them to effectively combat network jitter and improve transmission quality.
-
-
-
-## v4.0.0
-
-v4.0.0 was released on September 15, 2022.
-
-#### New features
-
-
-**2. Ultra HD resolution (Beta) (Windows, macOS)**
-
-In order to improve the interactive video experience, the SDK optimizes the whole process of video capture, encoding, decoding and rendering, and now supports 4K resolution. The improved FEC (Forward Error Correction) algorithm enables adaptive switches according to the frame rate and number of video frame packets, which further reduces the video stuttering rate in 4K scenes.
-
-Additionally, you can set the encoding resolution to 4K (3840 × 2160) and the frame rate to 60 fps when calling `SetVideoEncoderConfiguration`. The SDK supports automatic fallback to the appropriate resolution and frame rate if your device does not support 4K.
-
-This feature has certain requirements with regards to device performance and network bandwidth, and the supported upstream and downstream frame rates vary on different platforms. To experience this feature, contact [support@agora.io](mailto:support@agora.io).
-The increase in the default resolution affects the aggregate resolution and thus the billing rate. See Pricing.
-
-
-**3. Full HD and Ultra HD resolution (Android, iOS)**
-
-In order to improve the interactive video experience, the SDK optimizes the whole process of video capturing, encoding, decoding and rendering. Starting from this version, it supports Full HD (FHD) and Ultra HD (UHD) video resolutions. You can set the `dimensions` parameter to 1920 × 1080 or higher resolution when calling the `setVideoEncoderConfiguration` method. If your device does not support high resolutions, the SDK will automatically fall back to an appropriate resolution.
-
-The UHD resolution (4K, 60 fps) is currently in beta and requires certain device performance and network bandwidth. If you want to experience this feature, contact technical support.
-High resolution typically means higher performance consumption. To avoid a decrease in experience due to insufficient device performance, Agora recommends that you enable FHD and UHD video resolutions on devices with better performance.
-The increase in the default resolution affects the aggregate resolution and thus the billing rate. See Pricing.
\ No newline at end of file
+Agora provides the open source [example project](https://github.com/AgoraIO-Extensions/Agora-Unreal-RTC-SDK/tree/main/Agora-Unreal-SDK-CPP-Example) on GitHub for your reference.