Gyro Stabilization Bug?

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VMFXBV

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Gyro Stabilization Bug?

PostWed Aug 24, 2022 9:03 pm

Hello fellow BM users.

I have finally been able to take the gyro out for a test spin with our Pocket 4K (firmware 7.9.1) . Works quite well, except for one weird thing.

2 clips of the same tree in the forest taken from the same place at aprox. the same level of shakiness.
Same settings: BRAW Q0, 18mm (Sigma 18-35), Shutter 45.
One 60/25 4K DCI and the other 75/25 4K 2.40:1 cropped.

Metadata sees both as 18mm (which is the right focal length).

In resolve upon applying camera gyro stabilization:
- the 4K DCI one is very smooth as expected
- the 2.40:1 gets an incredible aggressive stutter (almost constant shake. like an error)

This shake also appears on all 2.40:1 clips I've taken that day (shutter between 30 and 45, various exposures) while all the 4K DCI 60fps clips work as intended.

Is this user error, Davinci Bug or Camera Bug? (does the gyro stabilization work in crop mode?).

Thanks!
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VMFXBV

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Re: Gyro Stabilization Bug?

PostTue Aug 30, 2022 9:19 pm

Here's an example of whats happening:

https://gifyu.com/image/Sw9Zz

Anyone?

:?
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Peter J. DeCrescenzo

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Re: Gyro Stabilization Bug?

PostFri Sep 02, 2022 1:10 pm

I get similar results shooting BRAW 4096 x 1720 @ 75/25 fps HFR: Insanely, crazy shakey footage (clip moves left/right very fast) after Gyro stabilization applied using latest DRS 18 and Pocket 4K firmware. Also happens with BRAW 75/24 fps HFR clips.

The same BRAW clips with Perspective stabilization applied play smoothly, as expected.

Other BRAW 4096 x 1720 HFR clips, such as 60/24 and 60/25 play as expected with Gyro stabilization applied.

I tested with a Panasonic 25mm f1.7 lens, and an Olympus 12-40mm f2.8 at 40mm.
Last edited by Peter J. DeCrescenzo on Sat Sep 03, 2022 3:04 am, edited 2 times in total.
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Peter J. DeCrescenzo

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Re: Gyro Stabilization Bug?

PostFri Sep 02, 2022 4:23 pm

One last test:

BRAW 1920 x 1080 @ 75/24 HFR shakes like crazy (left/right) after gyro stabilization is applied. Plays fine using Perspective stabilization.

Similar situation with BRAW HD 120/24 HFR footage, but left/right shakes are slower.
Last edited by Peter J. DeCrescenzo on Sat Sep 03, 2022 3:05 am, edited 1 time in total.
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Re: Gyro Stabilization Bug?

PostFri Sep 02, 2022 8:53 pm

Seems to be happening with footage that's over 60fps for some reason.

The "waveform" after gyro analysis looks normal though upon fast looking through it so it could be a
Resolve issue?

Posted this bug on the Resolve forum as well, hopefully someone from BM will see it and share some light on it.
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Uli Plank

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Re: Gyro Stabilization Bug?

PostSat Sep 03, 2022 7:13 am

Could it be that not enough samples are written for higher frame rates?
Interestingly, Sony‘s gyro stabilisation doesn’t work for 120 fps recordings at all.
It might be interesting to do a test with Gyroflow.
No, an iGPU is not enough, and you can't use HEVC 10 bit 4:2:2 in the free version.

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CaptainHook

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Re: Gyro Stabilization Bug?

PostSun Sep 04, 2022 11:54 pm

This is an issue in Resolve and should be addressed in a future update.
**Any post by me prior to Aug 2014 was before i started working for Blackmagic**
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Peter J. DeCrescenzo

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Re: Gyro Stabilization Bug?

PostMon Sep 05, 2022 2:12 am

CaptainHook wrote:This is an issue in Resolve and should be addressed in a future update.


Thanks for your fantastic support. Much appreciated. Cheers!
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Peter J. DeCrescenzo

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Re: Gyro Stabilization Bug?

PostWed Sep 07, 2022 6:55 pm

CaptainHook wrote:This is an issue in Resolve and should be addressed in a future update.


Ah, the key phrase being "a future update". :-)

Not addressed in today's DRS 18.0.2 update. Hopefully soon. Cheers!
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Re: Gyro Stabilization Bug?

PostFri May 26, 2023 9:32 pm

Has this been fixed in the later versions?

Also found a weird bug (still on 18.0.3 because of the black sun fix that is needed).

Whenever I apply gyro stabilization the clips are smooth but they all start with a weird slight rotation to the left at the very beginning. If I then scroll to a portion that is smooth and straight (thinking its user error), trim the clip to this new starting point in the edit tab, clear the tracking and re-apply stabilization from this new starting point it introduces that weird ass rotation to the left to the trimmed clip as well.

Bug?

Video below shows the issue:

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floridasolardesigngroup

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Re: Gyro Stabilization Bug?

PostSat May 27, 2023 8:50 pm

Mine is doing a similar thing, but not rotation. It moves in the same direction on all clips for the first 4 seconds or so. I just posted another thread about this, but I am new here and it's under moderation.

Here is sample footage (before and after stabiliation):
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Jason Szumlanski

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Re: Gyro Stabilization Bug?

PostWed May 31, 2023 11:59 pm

Sorry for the cross-posti, but head over to the Resolve board if you are experiencing this. The issue points to a Resolve software issue, not a hardware problem with the camera gyro.

Search that board for "gyro."
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Jason Szumlanski

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Re: Gyro Stabilization Bug?

PostFri Jun 09, 2023 10:49 am

This bug has been confirmed in Resolve. It's not a camera hardware issue.

See:

viewtopic.php?f=21&t=182200&p=955401#p955401

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