This repo has utility packages in python, golang to convert between media timecodes. Timecodes can be in one of the following formats:

• SMPTE (HH:MM:SS:FF(non-drop frame) or HH:MM:SS;FF(drop frame))
• Normal Playout time (HH:MM:SS.nnn)
• Float (seconds)

pip install https://github.com/amagioss/tc_utils/py

import tc_utils

# Returns: "smpte_timecode_non_drop"
tc_utils.GetTimecodeType("01:02:03:04")

# Returns: 4803.466666666666
tc_utils.ParseTimeStr("01:20:03:14", tc_utils.Rate_30)

# Returns: 4803.47013680347
tc_utils.ParseTimeStr("01:20:03;14", tc_utils.Rate_29_97)

# Returns: '01:20:03;14'
tc_utils.GetTimeStr(4803.470, tc_utils.SmpteTimecodeDrop, rate=tc_utils.Rate_29_97)

# Returns: '01:20:03:14'
tc_utils.GetTimeStr(4803.470, tc_utils.SmpteTimecodeNonDrop, rate=tc_utils.Rate_30) 

Test

cdp py
pytest -s ./tests/test_tc_utils.py

Dervied from the original code present in https://github.com/spiretechnology/go-timecode

cd go
go test -v ./timecode/ -run TestTcConversion

Derived from the original code present in https://github.com/spiretechnology/js-timecode

npm i
npm run test

npm start

import  * as tcUtils from './dist/index';

# Returns: "smpte_timecode_non_drop"
tcUtils.getTimecodeType("01:02:03:04")

# Returns: 4803.46699
tcUtils.parseTimeStr("01:20:03:14", tcUtils.Rate_30)

# Returns: 4803.465
tcUtils.parseTimeStr("01:20:03;14", tcUtils.Rate_29_97)

# Returns: '01:20:03;14'
tcUtils.getTimeStr(4803.470, tcUtils.smpteTimecodeDrop, tcUtils.Rate_29_97)

# Returns: '01:20:03:14'
tcUtils.getTimeStr(4803.470, tcUtils.smpteTimecodeNonDrop, tcUtils.Rate_30) 

The above tests test the following:

• Generate time codes for labeling every fram in a span of 24 hours
• Convert the timecodes to float time stamp
• Convert the float time stamp back to timecode
• Compare the original timecode with the converted timecode

1. https://support.telestream.net/s/article/Time-code-for-23-976-frames-p
2. http://www.andrewduncan.net/timecodes/