NET_DVR_Login_V40 provides better error detail. Enable extended error info:
If you are managing Hikvision IP cameras, NVRs, or DVRs using the iVMS-4200 client software, you may have encountered the frustrating . This error typically manifests as "Playback Failed" or "Real-time Playback Failed," often accompanied by a message stating that the network is disconnected or the device is busy.
If you are receiving this error while trying to change settings such as video resolution, bitrate, or frame rates, you are likely pushing a value that the hardware rejects.
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