The wind of hot stars are strongly structured and carry the numerous clumps of very different
sizes and masses. Contrary to the Wolf-Rayet stars, the individual clumps in the winds of OB
stars are rather small and not very long-lived objects. This makes the detecting clumps in OB
star wind a hard problem. We use the wavelet analysis as a powerful tool for searching the
details of the line profiles, connected with clumps. We use the dynamical wavelet spectra of
line profile variations (lpv) for studying a regular and a stochastic lpv.