You get to choose k for yourself, pretty much. The Matroska timecode format only stores the start time of the frame, not its duration, so when splicing two videos you get to choose the duration of the last frame in the first video for yourself. I'd just choose the same duration as the second to last frame had.
Example: the two last frames of the first video have the timestamps 960 and 1000, respectively (using millisecond timestamps here, so we have a one second long video clip at 25 fps - 40 ms per frame). The first frame of the second video would thus start at time 1040 (i.e. you'd add 1040 to all timestamps in the second video's timecode file).
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