Root-cause checklist (ranked by likelihood)
Dahua devices use TCP 37777 for control commands and TCP 37778 for video data (RTP). If your network uses a VPN or VLAN, ensure both ports are open. Port 37777 might be open (you see live view), but if 37778 is closed, playback fails specifically.
If the problem persists:
This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later. Failed To Start Playback Netsdk Returns Error Smart Pss
C:\Program Files\Smart Professional Surveillance System\SmartPSS ) with a fresh version from an official source or Cornick Support Storage Media Issues
Sync the time with a reliable NTP server (like windows.com ) or click to instantly match the NVR's clock to your computer's clock. 4. Software and Firmware Incompatibility
Aggressive firewall rules can block incoming UDP/TCP video stream packets. If the problem persists: This public link is
Resolving the "Failed To Start Playback Netsdk Returns Error" in Smart PSS
If you use Dahua security cameras or recorders, you likely rely on the Smart PSS software for video management. One of the most frustrating issues users encounter is the error message:
"After upgrading firmware, from SmartPSS I can get the green timeline but when trying to play the playback it says 'Failed to start playback. Failed to get data'. No problems for the Live view. From DMSS I'm experiencing the same behaviour." Can’t copy the link right now
The in Smart PSS is rarely a death sentence for your footage. In most cases, it is a synchronization issue (Step 1), a permissions glitch (Step 3), or a decoder overload (Step 4).
Dahua frequently updates its NetSDK architecture. If your NVR has modern firmware but you are running an older version of Smart PSS (like version 1.16 or early 2.x versions), they will speak different "languages." Conversely, the newer or SmartPSS Plus might be required for your specific hardware. How to fix it: Uninstall your current version of Smart PSS.
High latency or unstable connections, even if live view works, can cause playback initialization to fail.