Where is camera serial number located?

[jin-zhe]

Hi I'm using multiple GoPro Hero 5s in my current project and I'd like to extract the camera serial number to differentiate footages from different camera. How might I extract the camera serial number from the GPMD?

EDIT:
I realized it's captured within the fdsc and not the gpmd stream

[dnewman-gpsw]

the 'udta' (the user data atom) contains the classic metadata ever since HERO2. It has FIRM for firmware version, CAME for camera serial/ID, LENS for lens model/vendor/batch, MUID Media Unique ID, GUMI Global Unique Media Id, HMMT Hightlight moments. The details of these are outside of GPMF.

[jin-zhe]

Thanks @dnewman-gpsw ! Where and how do I go about obtaining the udta? I don't see it in any of the streams

[dnewman-gpsw]

'udta' is part of the MP4 structure within the 'moov' atom.