Epcom XMR401HDS User Manual page 39

Storage: The storage type for sub stream, internal SD and external SD optional.
Record mode: Mirror record, alarm back-up record and sub stream.
Mirror record: Channel is selectable. Video resolution and frame rate are the same with main

stream.
 Alarm backup: Channel is selectable. The parameters are the same with main stream
Sub stream: Channel is selectable. Recording parameters are configurable

Sub stream includes channel number, enable or not, audio, resolution, frame rate and image quality.
Sub stream channel: It is selectable according to recording mode.
 Record-->OSD
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User manual for XMR401HDS