lrv and thm files on gopro

Recently procured the latest model GoPro camera. Noticed there are some additional files created for each file, in addtional to the normal .mp4 file. What are these?

After a bit of research: 

.lrv file: it’s a big JPG file that has a bunch of screenshots grabbed from the video. Rename it to .Jpg (or just add a jpg to the end, ie file.lrv.jpg) and you can view it easily. 

.thm file: another mp4 format video file, but in a lower resolution. Also good for previwing your video in lower res, or even for doing edits, without having to deal with the potentially huge .mp4 file. Again, rename the thm file to .mp4 to make it easier to work with it. 

And lastely, the .mp4 file is the main video file. But you knew that already. 

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