I got a Tapo C113 camera as a replacement for a C120 with similar specs (quite choppy streaming regardless of firmware upgrades). The C113 is just perfect: cheap, small, high definition, great sensitivity in low light setups, smooth streaming, outdoor-compliant, and more. Integration with the Tapo app is flawless. My ONLY problem is that I cannot get it to work with my NVR due to a seemingly silly detail: the "minor" RTSP stream is too high-resolution (1280x720). All my other Tapo cameras (C110, C120, C320WS) have the standard 640x360 minor RTSP stream, which my NVR can consume (for preview display). For example, when querying the ONVIF streams of the C320WS, it reports back:

{
    'Manufacturer': 'tp-link',
    'Model': 'Tapo C320WS',
    'FirmwareVersion': '1.4.3 Build 251014 Rel.59660n',
    'SerialNumber': '<redacted>',
    'HardwareId': '2.0'
}

Profile Name: mainStream
Encoding: H264
Resolution: 1920x1080
FPS: 15
rtsp://<ip address>:554/stream1 

Profile Name: minorStream
Encoding: H264
Resolution: 640x360
FPS: 15
rtsp://<ip address>:554/stream2 

Profile Name: jpegStream
Encoding: JPEG
Resolution: 640x360
FPS: 1
rtsp://<ip address>:554/stream8 

In comparison, the C113 reports:

{
    'Manufacturer': 'tp-link',
    'Model': 'Tapo C113',
    'FirmwareVersion': '1.1.8 Build 260213 Rel.31569n',
    'SerialNumber': '<redacted>',
    'HardwareId': '1.0'
}

Profile Name: mainStream
Encoding: H264
Resolution: 2304x1296
FPS: 20
rtsp://<ip address>:554/stream1 

Profile Name: minorStream
Encoding: H264
Resolution: 1280x720
FPS: 20
rtsp://<ip address>:554/stream2 

Profile Name: jpegStream
Encoding: JPEG
Resolution: 640x360
FPS: 1
rtsp://<ip address>:554/stream8 

My NVR cannot show the cam preview with the 1280x720 resolution of the C113. The main stream has no issues and can be displayed and recorded normally. 

As noted in multiple other threads (example1, example2), "stream8" is apparently not to be used. It's very choppy, anyway. Even ffmpeg can't process it without significant packet loss.

This may well be my NVR's problem, of course, but it is a fact that the minor RTSP stream is non-standard, even when compared to other Tapo cameras. The minor RTSP resolution is not affected by the camera resolution setting defined in the Tapo app.

Feature request: reduce the C113 minor RTSP stream to the standard 640x360, either by fixing the value in firmware (should be straightforward) or by making it configurable in the app.

Feel free to change this into a bug report instead, if that makes more sense.