MIOFIVE S1 Ultra - 4K Front / 4K Rear - Review/Testing - RCG

[Angus66]

I finally had a chance to get my S1 Ultra cam (front only for now) and the mount is still a little loose/wobblily to me.

I'm not sure if it's negatively affecting the video image quality or not - it's been raining here on/off for the last three days so my recordings aren't the best.

I do like the fact that the mount allows for horizontal rotation in addition to the vertical adjustment - I haven't seen a lot of dash cam mounts that provide both.

One thing I don't like about the system is that it uses 8 pin mini USB* for the rear camera connection and the cable for it is pretty thick.

I had hoped that since it was a newer model, it used USB-C so I could use a shorter cable if necessary, or replace it if it was somehow damaged.

*EDIT: corrected my error regarding the connector type used for the rear camera.

 

[rcg530]

Miofive has released an updated firmware for the S1 Ultra's front camera to try an address a "jello effect" video quality issue. The firmware update version is S1_PUS_1.0.2_0113.

When the front camera is shaking due to the front mount not holding it firmly in place, the shaking would induce a "jello effect" rolling wave image through the video. I encountered that a few times. I updated my S1 Ultra's front camera firmware and I reinstalled the camera in my car. My weekly grocery shopping trip drive this past Friday still showed the shaking of the front camera, but I did not find any videos with the "jello effect" issue. It will take several driving sessions before I'll make a full statement that the "jello effect" no longer occurs.

Here is a "jello effect" video example with firmware S1_PUS_1.0.1_1124 installed.

 

[jaro]

is there an existing 3rd party mount that is compatible with the S1 front camera?

 

[rcg530]

is there an existing 3rd party mount that is compatible with the S1 front camera?

I'm not aware of a 3rd party mount that will work with the S1 Ultra front camera.

 

[rcg530]

Reviving my old review thread on the MIOFIVE S1 Ultra 2-channel dash camera. Back in July 2025, I received my fifth revised front camera mount bracket. The changes made by MIOFIVE were very helpful in stabilizing the front camera mount's moving pieces, but in the end the front camera still seems to bounce around a bit while driving. I believe the weight of the front camera body is a bit too much for the bracket and/or the adhesive pad. The adhesive pad provided with the fifth mount was a very thick gray adhesive pad. There may be some small amount of flex occurring in the very thick adhesive pad, but I believe the main source of the movement is the lower end of the mount where it connects to the front camera case.

I temporarily removed a front camera from another brand to make room for the S1 Ultra front camera. I still had the S1 Ultra's rear camera and cable present in my vehicle since it was latest tested. I updated the firmware for the front camera and installed the new front camera mount. The rear camera firmware was already at the latest version available for it.

Front: S1_PUS_1.0.2.0819
Rear: S1_P_1.2.1.1127

Yesterday, I went for a drive. I found several examples of the front camera bouncing around a bit on roads that are not very rough/bumpy. The five additional dash cameras in the vehicle did not have any bouncing present in their front camera video.

There’s a multiple second gap in the rear video files. It looks like the rear camera rebooted/restarted during this time. I checked all S1 Ultra cables and everything was/is fully plugged in.

I've sent an email to my MIOFIVE contact, but with it being during the lunar new year holiday break, I don't expect a response for the next week.

If I don't get any info indicating progress on the front camera stabilization, I will finish out my testing of the S1 Ultra and remove the front and rear cameras from my vehicle.

This next screenshot is from Adobe Premiere Pro in a 24-fps timeline which has the 659B, 660B [short video file], and the 662B video files. The position numbers are zero-based in Adobe Premiere Pro. The frame numbers within each second range from 0 to 23.

The gap between the 659B and the 660B video files is 3 seconds and 22 frames. The first few frames of the 660B video file have no status line text. The transition between the 660B file and the 662B file is correct [no missing video frames].