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video: accept timecode of 119.88 (120/1.001) FPS

Ruslan Khamidullin requested to merge ruslank/gstreamer:main into main

The drop-frame rules are specified in “SMPTE ST 12-3:2016” and are consistent with the traditional ones:

6.4.3 Drop frame – fractional system rate compensated mode

To minimize fractional time deviation from real time, the first two super-frame numbers (00 and 01) shall be omitted from the count at the start of each minute except minutes 00, 10, 20, 30, 40, and 50. Thus the first eight frame numbers (0 through 7) are omitted from the count at the start of each minute except minutes 00, 10, 20, 30, 40, and 50.

Where “super-frame” is a group of 4 frames for 120 FPS.

Fixes #2797 (closed)

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