Try not to have sample durations vary too much

            return UNKNOWN_ERROR;

        }

        // if the duration is different for this sample, see if it is close enough to the previous

        // duration that we can fudge it and use the same value, to avoid filling the stts table

        // with lots of near-identical entries.

        // "close enough" here means that the current duration needs to be adjusted by less

        // than 0.1 milliseconds

        if (lastDurationTicks && (currDurationTicks != lastDurationTicks)) {

            int64_t deltaUs = ((lastDurationTicks - currDurationTicks) * 1000000LL

                    + (mTimeScale / 2)) / mTimeScale;

            if (deltaUs > -100 && deltaUs < 100) {

                // use previous ticks, and adjust timestamp as if it was actually that number

                // of ticks

                currDurationTicks = lastDurationTicks;

                timestampUs += deltaUs;

            }

        }

        mStszTableEntries->add(htonl(sampleSize));

        if (mStszTableEntries->count() > 2) {