Overview

The cloud recording and playback functions of Huawei Cloud SparkRTC allow you to record and store audio/video calls or live video. Cloud recording supports two modes, as shown in Table 1.

**Table 1** Cloud recording modes
Mode	Description	Application Scenario
Single stream recording	Single stream recording by subscriber is supported. After automatic recording is enabled, each stream in the room is recorded. Media types for recording can be specified. The options are audio only, video only, and audio/video. MP4 and HLS files can be recorded, and AAC audio files can be encoded. The playback URL in the callback message can be obtained for playback. The downloadurl field in the callback message is the OBS playback URL. If the URL is used for playback, the corresponding download traffic or bandwidth fee will be generated in OBS. Users can select camera streams or screen sharing streams. Resolution can be specified.	Online class and content review
Mixed stream recording	Multi-channel video recording or multi-channel audio and video recording are supported. Media types for recording can be specified. The options are audio only, video only, and audio/video. MP4 and HLS files can be recorded, and AAC audio files can be encoded. Audio/video attributes can be configured, such as the bitrate, resolution, and frame rate. The playback URL in the callback message can be obtained for playback. The downloadurl field in the callback message is the OBS playback URL. If the URL is used for playback, the corresponding download traffic or bandwidth fee will be generated in OBS.	Co-hosting