src/main/java/org/jcodec/containers/mp4/QTTimeUtil.java
public static int timevalueToFrame(TrakBox trak, long tv) {
        TimeToSampleEntry[] tts = NodeBox.findFirstPath(trak, TimeToSampleBox.class, Box.path("mdia.minf.stbl.stts")).getEntries();
        int frame = 0;
        for (int i = 0; tv > 0 && i < tts.length; i++) {
            long rem = tv / tts[i].getSampleDuration();
            tv -= tts[i].getSampleCount() * tts[i].getSampleDuration();
            frame += tv > 0 ? tts[i].getSampleCount() : rem;
        }

        return frame;
    }
public static int timevalueToFrame(TrakBox trak, long tv) {
        TimeToSampleEntry[] tts = NodeBox.findFirstPath(trak, TimeToSampleBox.class, Box.path("mdia.minf.stbl.stts")).getEntries();
        int frame = 0;
        for (int i = 0; tv > 0 && i < tts.length; i++) {
            long rem = tv / tts[i].getSampleDuration();
            tv -= tts[i].getSampleCount() * tts[i].getSampleDuration();
            frame += tv > 0 ? tts[i].getSampleCount() : rem;
        }

        return frame;
    }
Finds frame by timevalue

@param tv
@return