/* takes ownership */
atom_moof_add_traf (moof, pad->traf);
/* write the offset into the first 'trun'. All other truns are assumed
- * to follow on from this trun. skip over the mdat header (+8) */
+ * to follow on from this trun. Skip over the mdat header (+12) */
atom_moof_copy_data (moof, &data, &size, &offset);
first_trun = (AtomTRUN *) pad->traf->truns->data;
- atom_trun_set_offset (first_trun, size + 8);
+ atom_trun_set_offset (first_trun, offset + 12);
pad->traf = NULL;
size = offset = 0;
atom_moof_copy_data (moof, &data, &size, &offset);