Exhibit 5.1

                                    May 8, 1998


SeaChange International, Inc.
124 Acton Street
Maynard, Massachusetts  01754

     Re:  S-3 Registration Statement
          --------------------------

Ladies and Gentlemen:

     We are counsel to SeaChange International, Inc., a Delaware corporation
(the "Company"), and have represented the Company in connection with the
preparation and filing of the Company's Registration Statement on Form S-3 (the
"Registration Statement") under the Securities Act of 1933, as amended, covering
the sale to the public of an aggregate of 625,000 outstanding shares of the
Company's Common Stock, $.01 par value per share (the "Shares"), being sold by
certain stockholders of the Company.

     We have reviewed the corporate proceedings taken by the Board of Directors
of the Company with respect to the authorization and issuance of the Shares.  We
have also examined and relied upon originals or copies, certified or otherwise
authenticated to our satisfaction, of all corporate records, documents,
agreements or other instruments of the Company and have made all investigations
of law and have discussed with the Company's officers all questions of fact that
we have deemed necessary or appropriate.

     Based upon and subject to the foregoing, we are of the opinion that the
Shares are legally issued, fully paid and non-assessable.

     We hereby consent to the filing of this opinion as Exhibit 5.1 to the
Registration Statement and to the reference to our firm in the Prospectus
contained in the Registration Statement under the caption "Legal Matters."

                                    Very truly yours,

                                    /s/ Testa, Hurwitz & Thibeault, LLP

                                    TESTA, HURWITZ & THIBEAULT, LLP