How does RV determine FPS from a file?

I’ve got a screen capture file that in ffmpeg presents itself as a 60000 / 1001 fps which is what I would expect, however in RV/RVLS it presents itself as 29.978.

What methodology does RV utilize on an H264 contained in an mp4 to determine FPS? (Note, this presents the problem in both RV 7.6.1 and 2021.0.3).


IE, is RV using avg_frame_rate (ala ffprobe style commands) or doing an introspection of a sample?