incorrect g-metrix data

just bought a virb ultra 30

I've paired my ant+ sensors but when I import my the video and g-metrix data it seems to be inaccurate

I can see a point where I stopped for a few minutes - HR drops as expected but power and cadence never drop to zero. If I zoom in the point on strava I can see that they do show zero - as was shown on my edge 520 during the ride

cadence hovers around 15 to 25 and power shows around 35 watts. Similar things happen whenever I stop. I tried importing the .fit file from my edge but it does the same thing.

This only seems to effect power/cadence - HR looks ok and in sync.

I've tried to sync the data in the app but it doesn't help

0 s_orange over 8 years ago

just to add to this thread - this is my thoughts as to where the problem 'might' lie

I notice when I first come to a stop both power and cadence drop to zero for a few seconds then slowly start to rise whilst I'm stationary - even if I've stopped for a minute or two.

I'm using a quarq power meter that gives power AND cadence over ANT+. I've noticed that when you're stationary for a few second that the cadence signal drops, this happens on all the quarqs I have used - it doesn't show zero - it shows "-" (blank) on the 520. Causes no problem with strava or Garmin connect as they show these values as zero.

I think that the virb edit software might be getting confused and interpreting this lack of data as a dropout and then it extrapolates to the next time you get cadence data - it also uses the last (or next ?) torque value from the power meter and extrapolates the power data in this gap too ?

I think this might explain the issues I'm seeing. Specific to the quarq or similar that don't put out continuous cadence data whilst stopped.

Anybody else seeing this behaviour ?

0 Pauleras over 8 years ago

farmers thompson

on my first tests what I've seen is thatn depending on the template loads one data source or other!!

0 mmi16 over 8 years ago

I use my VIRB Elite in auto racing.

I am using a Custom Overlay in VIRB Edit 3.6 that among other things displays speed as well as lap count and times when in sync with the G-metrix data.

What I am seeing in my exported videos. The speed shown on the video start decreasing on the video a second or so BEFORE the car reaches the braking zone. ??????

0 mmi16 over 8 years ago

My race videos exceed the capacity of a single VIRB file (which approximates 23 minutes 56 seconds). When the video puts 2 VIRB files together to record the full race distance - after the file transition the G-Metrix mismatch jumps to about 6.5 seconds as measured by my own stop watch when crossing the G-Metrix set start point.