tencent cloud

V2TXLivePusher
Last updated: 2025-07-24 16:57:45
V2TXLivePusher
Last updated: 2025-07-24 16:57:45
Overview
Tencent Cloud’s live stream publisher
Features
V2TXLivePusher encodes local audio/video and publishes the encoded data to a specified URL. It supports any publishing server. It has the following capabilities:
Custom video capturing. You can customize audio/video data sources based on your project requirements.
Retouching, filters, and stickers. V2TXLivePusher integrates multiple retouching algorithms (natural & smooth) and color space filters (custom filters are supported).
QoS control technology. V2TXLivePusher can adapt automatically to different upstream network conditions by controlling audio/video traffic in real time based on the network conditions of hosts.
Facial feature adjustment and animated widgets. Powered by YouTu’s AI facial recognition technology, V2TXLivePusher supports animated widgets and fine-tuning of facial features, such as eye enlarging, face slimming, and nose reshaping. You need to purchase a YouTu license to use these live streaming effects.

Basic SDK APIs

initWithLiveMode

This API is used to initialize the publisher.
  V2TXLivePusher(V2TXLiveMode liveMode)

Parameters

Parameter
Type
Description
liveMode
V2TXLiveMode
Publishing protocol: RTMP (default) or ROOM

addListener

This API is used to set the callbacks of the publisher. After the setting, you can listen for callback events of V2TXLivePusher, including publisher status, volume, statistics, warning and error messages, etc.
  void addListener(V2TXLivePusherObserver func)

Parameters

Parameter
Type
Description
observer
V2TXLivePusherObserver
Target object for the publisher’s callbacks. For details, see V2TXLivePusherObserver.

Basic Publishing APIs

setRenderViewID

This API is used to set the view for local camera preview. Images captured by the local camera are displayed on the view passed in after retouching, facial feature adjustments, and filter application.
  Future<V2TXLiveCode> setRenderViewID(int viewID)

Parameters

Parameter
Type
Description
viewID
int
The view ID, which is returned by V2TXLiveVideoWidget.onViewCreated(int viewID).

Response

V2TXLiveCode: V2TXLIVE_OK: successful

startPush

This API is used to start publishing audio/video data.
  Future<V2TXLiveCode> startPush(String url)

Parameters

Parameter
Type
Description
url
String
The URL to which data is published. Any publishing server is supported.

Response

V2TXLiveCode: V2TXLIVE_OK: successful
V2TXLIVE_ERROR_INVALID_PARAMETER: operation failed because the URL is invalid.
V2TXLIVE_ERROR_REFUSED: you cannot use the same stream ID for publishing and playback on the same device.

stopPush

This API is used to stop publishing audio/video data.
  Future<V2TXLiveCode> stopPush()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

isPushing

This API is used to get whether the publisher is publishing streams.
  Future<V2TXLiveCode> isPushing()

Response

Whether streams are being played
1: yes
0: no

Video APIs

setVideoQuality

This API is used to set the video encoding parameters for publishing.
  Future<V2TXLiveCode> setVideoQuality(V2TXLiveVideoEncoderParam param)

Parameters

Parameter
Type
Description
param
Video encoding parameters

setRenderRotation

This API is used to set the rotation of local camera preview.
  Future<V2TXLiveCode> setRenderRotation(V2TXLiveRotation rotation)

Parameters

Parameter
Type
Description
rotation
The degrees by which the image is rotated. Default value: v2TXLiveRotation0.

Response

V2TXLiveCode: V2TXLIVE_OK: successful

V2TXLiveRotation enumerated values

Value
Description
v2TXLiveRotation0
No rotation
v2TXLiveRotation90
Rotate 90 degrees clockwise
v2TXLiveRotation180
Rotate 180 degrees clockwise
v2TXLiveRotation270
Rotate 270 degrees clockwise

setRenderMirror

This API is used to set the mirror mode of local camera preview.
  Future<V2TXLiveCode> setRenderMirror(V2TXLiveMirrorType mirrorType)

Parameters

Parameter
Type
Description
mirrorType
The mirror mode of the camera. Default value: v2TXLiveMirrorTypeAuto.

Response

V2TXLiveCode: V2TXLIVE_OK: successful

V2TXLiveMirrorType enumerated values

Value
Description
v2TXLiveMirrorTypeAuto
The default value. In this mode, the front camera is mirrored, but the rear camera is not.
v2TXLiveMirrorTypeEnable
Both the front and rear cameras are mirrored.
v2TXLiveMirrorTypeDisable
Neither the front nor rear camera is mirrored.

startCamera

This API is used to turn the local camera on.
Note:
The startVirtualCamera, startCamera, and startScreenCapture APIs are mutually exclusive when you use them with the same pusher instance. For example, if you call startCamera first and then call startVirtualCamera, the SDK will stop publishing camera data and publish an image instead.
  Future<V2TXLiveCode> startCamera(bool frontCamera)

Response

V2TXLiveCode: V2TXLIVE_OK: successful

stopCamera

This API is used to turn the local camera off.
  Future<void> stopCamera()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

startVirtualCamera

This API is used to publish an image.
Note:
The startVirtualCamera, startCamera, and startScreenCapture APIs are mutually exclusive when you use them with the same pusher instance. For example, if you call startCamera first and then call startVirtualCamera, the SDK will stop publishing camera data and publish an image instead.
  Future<V2TXLiveCode> startVirtualCamera(String type, String imageUrl)

Response

V2TXLiveCode: V2TXLIVE_OK: successful
Parameter
Type
Description
type
String
Valid values: network (an image from the internet), file (a local image).
imageUrl
String
Image URL

stopVirtualCamera

This API is used to stop publishing images.
  Future<V2TXLiveCode> stopVirtualCamera()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

startScreenCapture

This API is used to start screen recording.
Note:
To start screen recording on iOS, instead of using this API, you need to do the following.
The startVirtualCamera, startCamera, and startScreenCapture APIs are mutually exclusive when you use them with the same pusher instance. For example, if you call startCamera first and then call startVirtualCamera, the SDK will stop publishing camera data and publish an image instead.
1. First, use Broadcast Upload Extension to start screen recording.
2. Then, call enableCustomVideoCapture to enable custom capturing.
3. At last, call sendCustomVideoFrame to send the screen images captured by Broadcast Upload Extension.
  Future<V2TXLiveCode> startScreenCapture(String appGroup)

Parameters

Parameter
Type
Description
appGroup
String
The App Group ID shared by the host app and Broadcast Upload Extension. You can set it to nil, but for better reliability, we recommend you set it as instructed in our documentation.

Response

V2TXLiveCode: V2TXLIVE_OK: successful

stopScreenCapture

This API is used to stop screen recording.
  Future<V2TXLiveCode> stopScreenCapture()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

snapshot

This API is used to take a screenshot of the local video while it is being published.
Note:
After V2TXLIVE_OK is returned, you can get the screenshot taken in the V2TXLivePusherObserver.onSnapshotComplete callback.
  Future<V2TXLiveCode> snapshot()

Response

V2TXLiveCode:
V2TXLIVE_OK: successful
V2TXLIVE_ERROR_REFUSED: failed to take a screenshot because publishing has stopped.

setWatermark

This API is used to set a watermark for the publisher. Watermarking is disabled by default.
  Future<V2TXLiveCode> setWatermark(String type, String image, double x,
      double y, double scale)

Parameters

Parameter
Type
Description
type
String
Valid values: network (an image from the internet), file (a local image).
image
String
Image URL
x
double
Watermark coordinate
y
double
Watermark coordinate
scale
double
Percentage by which the image is resized

setEncoderMirror

This API is used to set the mirror mode of encoded images.
  Future<V2TXLiveCode> setEncoderMirror(bool mirror)

Parameters

Parameter
Type
Description
mirror
Boolean
Whether to mirror encoded images. Default value: false.

enableCustomVideoCapture

This API is used to enable/disable custom video capturing. In the custom video capturing mode, the SDK stops capturing images from the camera, but continues to encode and send images.
  Future<V2TXLiveCode> enableCustomVideoCapture(bool enable)

Parameters

Parameter
Type
Description
enable
bool
Whether to enable custom video capturing. Default value: false.

sendCustomVideoFrame

This API is used to send the captured custom video data to the SDK.
  Future<V2TXLiveCode> sendCustomVideoFrame(V2TXLiveVideoFrame videoFrame)

Parameters

Parameter
Type
Description
videoFrame
V2TXLiveVideoFrame
Video frames sent to the SDK

Response

V2TXLiveCode:
V2TXLIVE_OK: successful
V2TXLIVE_ERROR_INVALID_PARAMETER: operation failed because the video data is invalid.
V2TXLIVE_ERROR_REFUSED: failed. You must call enableCustomVideoCapture to enable custom video capturing first.

enableCustomVideoProcess

This API is used to enable/disable custom video processing.
  Future<V2TXLiveCode> enableCustomVideoProcess(bool enable,
      V2TXLivePixelFormat pixelFormat, V2TXLiveBufferType bufferType)

Parameters

Parameter
Type
Description
enable
bool
Whether to enable custom video processing. Default value: false.
pixelFormat
V2TXLivePixelFormat
Pixel format of video frames
bufferType
V2TXLiveBufferType
Buffer type of video data

V2TXLivePixelFormat enumerated values

Value
Description
v2TXLivePixelFormatUnknown
Unknown
v2TXLivePixelFormatI420
YUV420P (I420)
v2TXLivePixelFormatTexture2D
OpenGL 2D texture

V2TXLiveBufferType enumerated values

Value
Description
v2TXLiveBufferTypeUnknown
Unknown
v2TXLiveBufferTypeByteBuffer
Direct buffers. This type is for I420 and other buffers and is used at the native layer.
v2TXLiveBufferTypeByteArray
Byte arrays. This type is for I420 and other buffers and is used at the Java layer.
v2TXLiveBufferTypeTexture
Texture ID, which allows direct operation. It delivers the best performance and has the smallest impact on video quality.

sendSeiMessage

This API is used to send an SEI message. V2TXLivePlayer can receive SEI messages via the onReceiveSeiMessage callback of V2TXLivePlayerObserver.
  Future<V2TXLiveCode> sendSeiMessage(int payloadType, Uint8List data)

Parameters

Parameter
Type
Description
payloadType
int
Data type. Valid values: 5, 242 (recommended).
data
Uint8List
Data to be sent

Response

V2TXLiveCode: V2TXLIVE_OK: successful

Beauty Filter APIs

getBeautyManager

This API is used to get the beauty filter manager TXBeautyManager. You can do the following using the beauty filter manger:
Set the beauty filter style and apply effects including skin brightening, rosy skin, eye enlarging, face slimming, chin slimming, chin lengthening/shortening, face shortening, nose narrowing, eye brightening, teeth whitening, eye bag removal, wrinkle removal, and smile line removal.
Adjust the hairline, eye spacing, eye corners, lip shape, nose wings, nose position, lip thickness, and face shape.
Apply animated effects such as face widgets (resources).
Add makeup effects.
Recognize gestures.
  TXBeautyManager getBeautyManager()

Audio APIs

startMicrophone

This API is used to turn the mic on.
  Future<V2TXLiveCode> startMicrophone()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

stopMicrophone

This API is used to turn the mic off.
  Future<V2TXLiveCode> stopMicrophone()

Response

V2TXLiveCode: V2TXLIVE_OK: successful

setAudioQuality

This API is used to set audio quality.
  Future<V2TXLiveCode> setAudioQuality(V2TXLiveAudioQuality quality)

Parameters

Parameter
Type
Description
quality
V2TXLiveAudioQuality
Audio quality

V2TXLiveAudioQuality enumerated values

Value
Description
v2TXLiveAudioQualitySpeech
Speech. Audio sample rate: 16 kHz; sound channel: mono; bitrate: 16 Kbps
This is designed for call scenarios such as online conferencing and audio calls.
v2TXLiveAudioQualityDefault
Default. Audio sample rate: 48 kHz; sound channel: mono; bitrate: 50 Kbps
This is the default audio quality of the SDK and is recommended.
v2TXLiveAudioQualityMusic
Music. Audio sample rate: 48 kHz; sound channel: dual; bitrate: 128 Kbps
This is designed for music-oriented scenarios with hi-fi requirements, such as karaoke and live music streaming.

Response

V2TXLiveCode:
V2TXLIVE_OK: successful
V2TXLIVE_ERROR_REFUSED: you cannot change audio quality settings when streams are being published.

enableVolumeEvaluation

This API is used to enable the volume reminder for audio capturing.
Note:
After enabling the volume reminder, you can get the volume measured by the SDK in the V2TXLivePusherObserver.onMicrophoneVolumeUpdate callback.
  Future<V2TXLiveCode> enableVolumeEvaluation(int intervalMs)

Parameters

Parameter
Type
Description
intervalMs
int
Interval (ms) for volume callbacks. The minimum interval allowed is 100 ms. If the value is 0 (default) or smaller, the callback is disabled. 300 is recommended.

Response

V2TXLiveCode: V2TXLIVE_OK: successful

Audio Effect APIs

getAudioEffectManager

This API is used to get the audio effect manager TXAudioEffectManager. You can do the following using TXAudioEffectManager:
Set the volume of audio captured by the mic.
Set reverb and voice changing effects.
Enable in-ear monitoring and set its volume.
Add background music and specify how to play it.
  TXAudioEffectManager getAudioEffectManager()

Device Management APIs

getDeviceManager

This API is used to get the device manager TXDeviceManager. You can do the following using TXDeviceManager:
Switch between the front and rear cameras.
Enable autofocus.
Set camera zoom level.
Enable/Disable flashlight.
  TXDeviceManager getDeviceManager()

Other APIs

setProperty

This API is used to call the advanced APIs of V2TXLivePusher.
  Future<V2TXLiveCode> setProperty(String key, String value)

Parameters

Parameter
Type
Description
key
String
Key of the advanced API to call
value
String
Parameters required by the advanced API

Response

V2TXLiveCode:
V2TXLIVE_OK: successful
V2TXLIVE_ERROR_INVALID_PARAMETER: operation failed because key is empty.

setMixTranscodingConfig

This API is used to set On-Cloud MixTranscoding parameters. If you have enabled relay to CDN on the Function Configuration page of the TRTC console, each anchor will have a default CDN address. There may be multiple anchors in a room, each sending their own video and audio, but the audience needs only one live stream. Therefore, you need to mix multiple audio/video streams into one standard live stream. This is MixTranscoding.
  Future<V2TXLiveCode> setMixTranscodingConfig(V2TXLiveTranscodingConfig? config)

Parameters

Parameter
Type
Description
config
V2TXLiveTranscodingConfig
On-Cloud MixTranscoding configuration

V2TXLiveTranscodingConfig

Value
Description
v2TXLiveBufferTypeUnknown
Unknown
v2TXLiveBufferTypeByteBuffer
Direct buffers. This type is for I420 and other buffers and is used at the native layer.
v2TXLiveBufferTypeByteArray
Byte arrays. This type is for I420 and other buffers and is used at the Java layer.
v2TXLiveBufferTypeTexture
Texture ID, which allows direct operation. It delivers the best performance and has the smallest impact on video quality.

showDebugView

This API is used to set whether to display the dashboard.
  Future<V2TXLiveCode> showDebugView(bool isShow)

Parameters

Parameter
Type
Description
isShow
bool
Whether to display the dashboard. Default value: false.
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