src/main/java/org/jcodec/containers/mp4/QTTimeUtil.java
public static String qtPlayerTimecode(TimecodeMP4DemuxerTrack timecodeTrack, RationalLarge tv, int movieTimescale)
            throws IOException {
        TrakBox tt = timecodeTrack.getBox();
        int ttTimescale = tt.getTimescale();
        long ttTv = editedToMedia(tt, tv.multiplyS(ttTimescale), movieTimescale);

        return formatTimecode(
                timecodeTrack.getBox(),
                timecodeTrack.getStartTimecode()
                        + timevalueToTimecodeFrame(timecodeTrack.getBox(), new RationalLarge(ttTv, ttTimescale),
                                movieTimescale));
    }
public static String qtPlayerTimecode(TimecodeMP4DemuxerTrack timecodeTrack, RationalLarge tv, int movieTimescale)
            throws IOException {
        TrakBox tt = timecodeTrack.getBox();
        int ttTimescale = tt.getTimescale();
        long ttTv = editedToMedia(tt, tv.multiplyS(ttTimescale), movieTimescale);

        return formatTimecode(
                timecodeTrack.getBox(),
                timecodeTrack.getStartTimecode()
                        + timevalueToTimecodeFrame(timecodeTrack.getBox(), new RationalLarge(ttTv, ttTimescale),
                                movieTimescale));
    }
Calculates and formats tape timecode as in Quicktime player

@param timecodeTrack
@param tv
@param startCounter
@return
@throws IOException