Blackmagic Forum

Hi there,

I'm coding a .braw importer for Blender3D.

For now I just want to map the gyro data to a camera inside of blender.
I've successfully extracted the data from the .braw file using the BM Raw SDK.
Now I'm struggling with understanding the data structure.
Is there some more specific specs and/or references on the Gyro and Acceleration data extracted from a .braw file.
How is the Gyro and Acceleration Data organized?

Can someone help me with this?

Many thanks and greets from Germany!

Konstantin

Hi,

Briefly the data is stored as:

Gyro = Radians / Second
Accelerometer = metres per second squared (m/s/s or m/(s^2))

The other useful information when it comes to stabilisation is sensor_line_time = micro seconds (us). This is the time a single line takes to be read and can be used to calculate overall read out speed to try compensate for rolling shutter etc. Eg For Pocket 6K depending on record format you might get something like ~5.708us for sensor line time - assuming 3456 pixels high this would mean 3456 pixels *~ 0.005708 = ~19.73ms as a read out speed for the frame.

Gyroflow is open source and using Blackmagic RAW gyro data in their app so you may want to check their source for inspiration/ideas if needed:

https://github.com/gyroflow/gyroflow

Getting the gyro data into a 3D app's camera would be interesting

I've mentioned elsewhere that it would seem to be quite useful for sky/background replacement on a moving camera (or anything where the lack of xyz position data doesn't really matter)

I even wondered if it's the sort of thing the new studio cameras could do something with live (since they're tripod mounted) for virtual sets, without any external trackers

Cheers,

Steve

That's amazing! I was starting to think along those lines (mostly for matching camera movements on 3D elements for green screen backgrounds. Please let us know about the progress and if we can help (I'm afraid I'm not much of a coder, but I'd be willing to be a beta tester on this).

Thanks!
Will

Any news on this topic?

I want to import BRAW gyro data into Blender 4.x after doing some green screen shots.

Gyroflow can export to Blender.

Chris Hocking wrote:Gyroflow can export to Blender.

Thanks.
Could you please give more details about the workflow? I have not found any information on how the roundtrip should work.