Instead of asserting return a runtime error if the maximum sample size cannot be determined.

            }

            size_t max_size;

            CHECK_EQ(mLastTrack->sampleTable->getMaxSampleSize(&max_size), OK);

            err = mLastTrack->sampleTable->getMaxSampleSize(&max_size);

            if (err != OK) {

                return err;

            }

            // Assume that a given buffer only contains at most 10 fragments,

            // each fragment originally prefixed with a 2 byte length will