Download the Dahua NetSDK for Windows from the official Dahua support site (or reputable source). Inside the zip file, find the libs folder. Copy the following files into your Smart PSS installation directory (usually C:\Program Files\SmartPSS\ ) – overwriting the existing ones:
C:\Program Files\Smart Professional Surveillance System\SmartPSS Replace the file : Download an updated dhnetsdk.dll Failed To Start Playback Netsdk Returns Error Smart Pss