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Tourist
Posts: 3
Accepted Solution

Unexplained Change in Video Quality / Hero 2018

HERO 2018

 

I really hope someone can assist with some insight. I have a scenario where video quality has dropped significantly over time, from one session to another, although setting and environment appear to be identical.

 

Image 1

A screenshot of footage from May 2019. Quality is good.

GoPro screenshot_May 2019.png

Settings according to Quik:

May settings.png

 

Image 2

A screenshot of footage from Sept 2019. Quality is poor/unusable, despite identical settings and environment. Note the grain.

GoPro screenshot_Sept 2019.png

Settings according to Quik:

Sep settings.png

 

I'd value any direction or suggestions in this regard. I've since tested the same environment with different levels of light, different times of day, different camera positions - and I cannot get back to the high quality of May 2019. Does anyone have any suggestions?

 

Thanks in advance.

 

 

 


Accepted Solutions
Explorer
Posts: 11,998

Re: Unexplained Change in Video Quality / Hero 2018

I should have been more specific. Locking directly on the light coming through the window will cause the entire room to get much darker. However, this will be due to the ISO dropping to it's lowest value (however it will also cause the shutter to get considerably faster, which you don't need). In your pictures, I would probably choose the side of the closet. Normally, yes, on the subject is best, but since you want the lowest ISO, probably not in this case. You can always bring up exposure in edits, but you can't bring down the ISO. Since your camera doesn't have Protune settings, you need to be creative in simulating manual adjustments.

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All Replies
Explorer
Posts: 11,998

Re: Unexplained Change in Video Quality / Hero 2018

It appears that the ISO jumped up considerably in the second video. If you haven't already, be sure the EIS is turned off (not needed since your camera is mounted). EIS causes the camera to favor a higher frame rate over lower ISO. Auto Low light should also be off, although in 30fps it should be off by default.

Also, you might want to use the Exposure Control and focus on a bright spot in the room. Lock this value to keep the camera from adjusting to a higher ISO automatically. Of course, make sure the lens and lens protector are clean.
Tourist
Posts: 3

Re: Unexplained Change in Video Quality / Hero 2018

Hey danielr15, thanks for the response. APologies for the silence but I've been testing various things based upon your information.

 

Firstly, the matter of ISO. I noted to my surprise that the EIS on the camera had been turned on. I didn't do this consciously. I've turned it off now and the difference is noticeable, thank you for that. It would be really useful if the interface provided some feedback on the implications of setting decisions. Even something like what you said, 'Favours higher frame rate over lower ISO', would've given me pause if I'd seen it. Anyway, thanks - I've done some testing and I believe this is most of the reason for the change I described.

 

Secondly, I find your Exposure Control suggestion to be interesting. You'll see that a light spot in the room, in my case, is probably the window. Locking this in will then darken the room. This doesn't seem right to me as the subjects being captured are in the room and not outside. I'd expect that setting the exposure on the subjects being filmed, or on a fdarker spot like the chalkboard, would be the optimum setting? But perhaps I didn't understand you correctly. Thanks again

Explorer
Posts: 11,998

Re: Unexplained Change in Video Quality / Hero 2018

I should have been more specific. Locking directly on the light coming through the window will cause the entire room to get much darker. However, this will be due to the ISO dropping to it's lowest value (however it will also cause the shutter to get considerably faster, which you don't need). In your pictures, I would probably choose the side of the closet. Normally, yes, on the subject is best, but since you want the lowest ISO, probably not in this case. You can always bring up exposure in edits, but you can't bring down the ISO. Since your camera doesn't have Protune settings, you need to be creative in simulating manual adjustments.
Highlighted
Tourist
Posts: 3

Re: Unexplained Change in Video Quality / Hero 2018

Thanks Daniel. I like the suggestion of exposing for low ISO with the option to adjust exposure in post, rather than expose for brightness (and high ISO) and then struggle with grain... Good work. Smiley Happy