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Frames in one secod

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I am trying to bookmark some of my analog transfers (RH1->3.5mm audio cable->audio recorder). For this I need to know exactly when each track starts and ends. I have found that it should be 86 frames within one second, but that does not look like it is the case. I have tried NetMDPython and it looks like it has around 85 frames per second, but not precisely. You can try adding up frames and checking it yourself (1st example: (80 + 84) - 85 = 79, 2nd example: 382 - 85 x 4 != 43). Maybe there is a bug in the script? I would love to try https://github.com/glaubitz/linux-minidisc/tree/master/libnetmd, but I cannot build it under Windows.

Can anyone please explain how exactly should I interpret frames in NetMDPython? For example how to translate 85 or 50 frames into milliseconds? Why do I get neither 85 nor 86 frames per second when I have many tracks within one MiniDisc (the more tracks there is, the bigger the inconsistency)?

 

Time used: 00:00:19+079 (0.26%)
2 tracks
000: 00:00:09+080 lp4 stereo protected 11
001: 00:00:09+084 lp4 stereo protected 22

Time used: 00:01:21+043 (1.01%)
8 tracks
000: 00:00:09+080 lp4 stereo protected 11
001: 00:00:09+084 lp4 stereo protected 22
002: 00:00:09+084 lp4 stereo protected 33
003: 00:00:10+010 lp4 stereo protected 44
004: 00:00:10+018 lp4 stereo protected 55
005: 00:00:10+022 lp4 stereo protected 66
006: 00:00:10+034 lp4 stereo protected 77
007: 00:00:10+050 lp4 stereo protected 88

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