If the error is caused by a hung process, a "hard" restart or clean install can clear the cache and reset the connection.
Note: This reduces compression efficiency but guarantees compatibility. Failed To Start Playback Netsdk Returns Error Smart Pss
Understanding the NetSDK Error in SmartPSS If you’re using Dahua’s SmartPSS software and run into the "Failed to start playback. NetSDK returns error" If the error is caused by a hung
Not all "Smart PSS playback failed" errors are software-related. Failed To Start Playback Netsdk Returns Error Smart Pss
How to Fix "Failed To Start Playback. NETSDK Returns Error" in SmartPSS