Cure for Jello video shake in phone camera

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svtdoug
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Cure for Jello video shake in phone camera

Post by svtdoug » Tue May 28, 2019 9:01 pm

I am using an LG G5 phone to run Harry's Grand Prix and take video for on track HP and DE events. I have my phone mounted with the recommended RAM suction cup mount to the windshield. The issue is the video quality from the phone. I get major jello-ing affect in the video - very distorted video. I have tried the phone's several image stabilization settings, but none prove satisfactory. I know, one answer is to go with a separate GoPro camera, but that adds complexity which I would rather not add, if I can help it. Already enough complexity at this point, in the cockpit.

So my question is, is anyone getting reasonable video quality without the Jello affect from their phones, with a windshield mount? If so, what phone and model are you using?

Thanks much!

Doug
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Harry
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Re: Cure for Jello video shake in phone camera

Post by Harry » Tue May 28, 2019 10:16 pm

Optical image stabilization cannot be turned off for most phones. The moving lens vibrates with engine frequency creating the named effects. This is a problem for a higher level modern smartphones.

Known options (discussed a few times here on the forum already ;-) ):

1) Use an action cam
2) Use the front facing cam
3) Add a small magnet near the lens fixing vibrations

All of these have downsides. The last one may hark your video stabilization.

Harry
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maxgt4
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Re: Cure for Jello video shake in phone camera

Post by maxgt4 » Thu May 30, 2019 12:52 pm

Although this issue has in fact been discussed a few times I think it's not a problem with modern phones in general. I used Laptimer with the internal camera of a SONY Xperia SP, Xperia Z3 compact and the XZ1 compact, all mounted with a RAM MOUNT XGrip. None of them had a problem with shaky videos. I can just guess why, but maybe the video stablilization algorithm used by SONY is less aggressive (or they don't use it at all). Based on this experience I am currently thinking of getting a Xperia XZ3 especially for use with HLT (costs currently less than a GoPro Hero 7 black).
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Harry
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Re: Cure for Jello video shake in phone camera

Post by Harry » Thu May 30, 2019 1:00 pm

Please do not mix up optical image / video stabilization and digital stabilization. While the later is depending on the algorithm chosen, the former is a mechanical thing - including a moving lense. You can turn off digital stabilization in LapTimer, the mechanical - if it exists at all - cannot be turned off by software. Not all modern smartphones feature this advanced optical stabilization, and I assume there are different solutions around being better or less suited for on track use.

See https://en.wikipedia.org/wiki/Image_stabilization

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maxgt4
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Re: Cure for Jello video shake in phone camera

Post by maxgt4 » Thu May 30, 2019 1:31 pm

Thank you very much for the explanation, Harry. Based on the specs I believe the SONYs don't have the mechanical stabilization which might be the reason for the better results.
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