# RecorderManager.start(Object object)
Starts recording
# Parameters
# Object object
| Property | Type | Default Value | Required | Description | Minimum Version |
|---|---|---|---|---|---|
| duration | number | 60000 | No | Recording duration (in ms). The maximum value is 600,000 (10 minutes). | |
| sampleRate | number | 8000 | No | Sampling rate | |
| numberOfChannels | number | 2 | No | Number of recording channels | |
| encodeBitRate | number | 48000 | No | Encoding bitrate. Valid values are shown in the following table. | |
| format | string | aac | No | Audio format | |
| frameSize | number | No | Specifies the frame size (in KB). If this field is specified, the recorded file will be called back whenever reaching the specified frame size. If it is not specified, the recorded file will not be called back. Only MP3 format is supported. | ||
| audioSource | string | auto | No | Specifies the audio source for recording. Available audio sources can be obtained via wx.getAvailableAudioSources() | 2.1.0 |
Valid values of object.sampleRate
| Value | Description | Minimum Version |
|---|---|---|
| 8000 | 8000 Hz sample rate | |
| 11025 | 11025 Hz sample rate | |
| 12000 | 12000 Hz sample rate | |
| 16000 | 16000 Hz sample rate | |
| 22050 | 22050 Hz sample rate | |
| 24000 | 24000 Hz sample rate | |
| 32000 | 32000 Hz sample rate | |
| 44100 | 44100 Hz sample rate | |
| 48000 | 48000 Hz sample rate |
Valid values of object.numberOfChannels
| Value | Description | Minimum Version |
|---|---|---|
| 1 | 1 channel | |
| 2 | 2 channels |
Valid values of object.format
| Value | Description | Minimum Version |
|---|---|---|
| mp3 | MP3 format | |
| aac | AAC format |
Valid values of object.audioSource
| Value | Description | Minimum Version |
|---|---|---|
| auto | Automatic setup. The mobile microphone is used by default. The headset microphone is automatically adopted when the headset is plugged in. This setup applies to all platforms. | |
| buildInMic | Mobile microphone for iOS only | |
| headsetMic | Headset microphone for iOS only | |
| mic | Microphone (if the headset is not plugged in, the mobile microphone is used; otherwise, the headset microphone is used) for Android only | |
| camcorder | Same as mic. Suitable for audio and video recording. For Android only. | |
| voice_communication | Same as mic. Suitable for real-time communication. For Android only. | |
| voice_recognition | Same as mic. Suitable for speech recognition. For Android only. |
# Limits to Sample Rate and Encoding Bitrate
Each sample rate has a valid range of encoding bitrates. An invalid sample rate or encoding bitrate will cause recording failure. The sample rates and their encoding bitrate are shown as follows.
| Sample Rate | Encoding Bitrate |
|---|---|
| 8000 | 16000 ~ 48000 |
| 11025 | 16000 ~ 48000 |
| 12000 | 24000 ~ 64000 |
| 16000 | 24000 ~ 96000 |
| 22050 | 32000 ~ 128000 |
| 24000 | 32000 ~ 128000 |
| 32000 | 48000 ~ 192000 |
| 44100 | 64000 ~ 320000 |
| 48000 | 64000 ~ 320000 |