Mainstream provides the highest video quality, and is the stream the DVR / NVR uses when saving footage to the internal mainstream settings can be adjusted to increase or decrease recording resolution. These settings will impact recording file size and available recording time. Any problem in using Lorex camera without delay dial Lorex Customer Service+888-399-0817 at any time as per your comfortable and remove all hurdles. Get in contact with our technical team and receive valuable advice from them.