Found this on FB.  A guy came up with Python scripts to use Blackbox data to stablize video from other sources.  More info in the video description (including a github link to the scripts).

Nice.

I started experimenting with this a while back but doing the 'stabilisation' in OpenCV. The awkward bit is syncing the start time of the video to the arming of the quad (since that's when the blackbox log begins), and getting the sample rates to play nice. I considered just getting the gyro data in the right format and letting Reelsteady do the heavy lifting, but that meant having a license of Reelsteady and I liked the idea of zero dependency, self-contained and free option.

Maybe I'll dust it off and have another go ...

just an idea, but a simple sync mechanism could be to put an LED just under the lens of the action cam, so that when the quad is powered up, the LED will pulse a few times, creating a preamble. This plusing will show up in the action cam and can be used as a sync marker. Getting OpenCV to sync and cut at that specific point would be much easier. A few passive components and a 555 timer should do the job easily.

I was thinking of using the sound of the motors running up. It might require some filtering to isolate the relevant frequency, but it might just be enough to look for volume spikes.

(21-Dec-2020, 09:42 AM)Banelle Wrote: I was thinking of using the sound of the motors running up. It might require some filtering to isolate the relevant frequency, but it might just be enough to look for volume spikes.

Yes that is much easier. If you get a github project for it started, let me know, I'd love to contribute 

This is an interesting and exciting development concerning this topic. Use virtually any camera with ReelSteady by inserting the metadata from blackbox into the mp4 container file. I'm going to give this a whirl. I have ordered a few OpenLogger serial boards and to test it out.

People are saying good things about the Gyroflow Open Source project. It makes use of the gyro data from the blackbox log so can be used with footage from any camera, and it doesn't have any dependency on ReelSteady either.

https://github.com/ElvinC/gyroflow

(21-Dec-2020, 03:27 PM)nuxnik Wrote: Yes that is much easier. If you get a github project for it started, let me know, I'd love to contribute 

what if you used betaflight to start and stop recording, then you should be able to line it up exactly

Gyroflow is in alpha testing, but you can give it a try: http://gyroflow.xyz/

Quote:Awful user interface

Designed by someone with absolutely no UX design experience. Maybe it’s awful, maybe it isn’t, idk.

Alright stabilization

Might’ve been almost state of the art back in 2011, still way behind other (commercial) implementations

Arduous workflow

“Why spend so much time and effort with logging, calibration, and messing around with sync when I can just run it through warp stabilizer?” - Potential user

Nice :-D

When we're finally allowed out again I'll have to give this a try. 32MB of Blackbox flash should be enough for a few flights if I turn the sample rate down.