05-04-2017 03:03 PM
Hi everyone! I'm a relatively new GoPro Hero 5 Black owner and last night I tried shooting a time lapse video for the first time of the sun setting across the lake. The video actually turned out great, but towards the end, the exposure changes about 3-4 times - it gets visibly brighter, then it gets darker (because the sun is fading) and then the exposure adjusts to something brighter again, and this repeats several times before the video ends. When I played the video back and saw this I was really disappointed because I didn't want the exposure to change, I just wanted the video to get darker and darker as the sun faded away.
The first thing I did when I got home was Google the issue, and I was excited to find this: https://gopro.com/help/articles/How_To/How-to-Smooth-Exposure-Transition-in-Time-lapse-Videos - basically it sounded like a way to fix the exact problem I just explained! So I opened the video in GoPro Studio and followed the instructions (I click on the Advanced Settings button, then I have to check the Speed Up checkbox in order to be able to see the Frame Blend (Motion Blur) check box, and I check that) but nothing seems to happen? When I play the video back, the exposure still changes multiple times throughout. And even if I convert it to a .AVI file and import it on the next tab, the exposure still changes.
Has anyone encountered this problem and can anyone tell me how to fix it, or if there is a way to fix it? Here's what I'm wondering specifically:
1. Is it possible to correct the flickering exposure in post? Can it be done in GoPro Studio, and do you need to use the Frame Blend (Motion Blur) option? If so, can someone please explain how it works? I searched both Google and YouTube for help and couldn't find anything about how to use it, beyond the link I posted above.
2. If the flickering exposure is not possible to fix in post, how can I avoid this problem with time lapse videos in the future? Is there a way to lock the exposure so that it doesn't try to auto-adjust when there's less light available?
Thanks very much in advance for any help or advice anyone can offer for this problem! I would be very grateful! :)
05-05-2017 12:09 PM
Hi, thanks for your reply, but I do not believe you are correct. The page I linked specifically says that the feature is for Time Lapse Videos.
I did determine that I think this problem can be avoided in the future by using the Locked Exposure feature on the Hero 5, which is accessed by pressing and holding on the rear LCD touchscreen until a small box appears - at the bottom of this frame, you can toggle between Auto Exposure and Locked Exposure. Using Locked Exposure should solve this problem for future time lapses, but alas, I have yet to figure out if there is a way to fix the problem in post.
05-05-2017 02:37 PM - edited 05-05-2017 02:40 PM
The link is to a help article that was created before the option for times laps video was even an option in GoPro cameras. It is talking about making a time laps video from time laps photos.
You're most likely not going to find an option for correcting in post unless you make several cuts to the video and make the adjustments yourself.
When you allow the camera to create the video from your time laps photos, you will be working with the equivalent of a post project. To have the most control, you want to create the time laps in post using the photo files, not an already rendered video from those files.
I hope the spot metering works out for you.
09-05-2017 01:08 AM
The fix in you link is for seprate timelapse photos for a timelapse video.
One fix you could try: convert you video into separate frames(jpegs). I havn't done this myself, but I think VLC can do this.
Then work with matching the over and under exposed frames.
Then re-asemble the frames into a timelapse video. Maybe your link will work with getting Studio to do it.
BTW, read up about expose flickering, lot of people have the same problem with dlsr's
09-05-2017 01:22 AM