gst_qtdemux_move_stream (GstQTDemux * qtdemux, QtDemuxStream * str,
    guint32 index)
{
  /* no change needed */
  if (index == str->sample_index)
    return;

  GST_DEBUG_OBJECT (qtdemux, "moving to sample %u of %u", index,
      str->n_samples);

  /* position changed, we have a discont */
  str->sample_index = index;
  /* Each time we move in the stream we store the position where we are 
   * starting from */
  str->from_sample = index;
  str->discont = TRUE;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.