SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934
                                (Amendment No. )*


                                  RENTRAK CORP.
                                (Name of Issuer)

                Class A Common Stock, $0.001 Par Value Per Share
                         (Title of Class of Securities)

                                   760174 102
                                 (CUSIP Number)

                                  March 4, 1998
             (Date of Event Which Requires Filing of this Statement)

     Check the  appropriate  box to  designate  the rule  pursuant to which this
Schedule is filed: / / Rule 13d-1(b) /X/ Rule 13d-(c) / /Rule 13d-1(d)

     Check the following box if a fee is being paid with this  statement |_|. (A
fee is not required only if the filing person:  (1) has a previous  statement on
file  reporting  beneficial  ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto reporting  beneficial  ownership of five percent or less of such class.)
(See Rule 13d-7.)

     *The  remainder  of this cover  page  shall be filled  out for a  reporting
person's  initial  filing on this  form with  respect  to the  subject  class of
securities,  and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.

     The  information  required in the remainder of this cover page shall not be
deemed to be "filed"  for the purpose of Section 18 of the  Securities  Exchange
Act of 1934 ("Act") or otherwise  subject to the  liabilities of that section of
the Act but shall be subject to all other  provisions of the Act  (however,  see
the Notes).

                       (Continued on the following pages)


                                  Page 1 of 7





CUSIP NO.  760174 102

(1)       Name of Reporting Person
          S.S. or I.R.S. Identification No. of Above Person
                         Blockbuster Videos, Inc.
          ----------------------------------------------------------------------
                         I.R.S. Identification No. 75-1889838
          ----------------------------------------------------------------------

(2)       Check the Appropriate Box if a Member of Group (See Instructions)

          /  / (a)
                    ------------------------------------------------------------
          /  / (b)
                    ------------------------------------------------------------

(3)       SEC Use Only
                         -------------------------------------------------------

(4)       Citizenship or Place of Organization          Delaware
                                                  ------------------------------

- - ---------------
Number of                (5)  Sole Voting Power                       0
  Shares                                               -------------------------
Beneficially             (6)  Shared Voting Power                1,000,000*
 Owned by                                              -------------------------
   Each                  (7)  Sole Dispositive Power                  0
Reporting                                              -------------------------
Person With              (8)  Shared Dispositive Power           1,000,000*
- - ---------------                                        -----------------------


(9)       Aggregate Amount Beneficially Owned by Each Reporting Person
                         1,000,000*
          ----------------------------------------------------------------------

(10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
                              --------------------------------------------------

(11)      Percent of Class Represented by Amount in Row (9)
                         8.48%
          ----------------------------------------------------------------------

(12)      Type of Reporting Person (See Instructions)       CO
                                                       -------------------------

          (*All shares underlie currently exercisable warrants)


                                    Page 2 of 7




CUSIP NO.  760174 102

(1)       Name of Reporting Person
          S.S. or I.R.S. Identification No. of Above Person
                         VIACOM INC.
          ----------------------------------------------------------------------
                         I.R.S. Identification No. 04-2949533
          ----------------------------------------------------------------------

(2)       Check the Appropriate Box if a Member of Group (See Instructions)

          /  / (a)
                    ------------------------------------------------------------
          /  / (b)
                    ------------------------------------------------------------

(3)       SEC Use Only
                         -------------------------------------------------------

(4)       Citizenship or Place of Organization          Delaware
                                                  ------------------------------

- - ---------------
Number of                (5)  Sole Voting Power                       0
  Shares                                               -------------------------
Beneficially             (6)  Shared Voting Power                1,000,000*
 Owned by                                              -------------------------
   Each                  (7)  Sole Dispositive Power                  0
Reporting                                              -------------------------
Person With              (8)  Shared Dispositive Power           1,000,000*
- - ---------------                                        -----------------------


(9)       Aggregate Amount Beneficially Owned by Each Reporting Person
                         1,000,000*
          ----------------------------------------------------------------------

(10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
                              --------------------------------------------------

(11)      Percent of Class Represented by Amount in Row (9)
                         8.48%
          ----------------------------------------------------------------------

(12)      Type of Reporting Person (See Instructions)       CO
                                                       -------------------------

          (*All shares underlie currently exercisable warrants)




                                    Page 3 of 7




CUSIP NO.  760174 102


(1)       Name of Reporting Person
          S.S. or I.R.S. Identification No. of Above Person
                    SUMNER M. REDSTONE
          ----------------------------------------------------------------------
                    S.S. No.
          ----------------------------------------------------------------------


(2)       Check the Appropriate Box if a Member of Group (See Instructions)

          /  / (a)
                    ------------------------------------------------------------
          /  / (b)
                    ------------------------------------------------------------

(3)       SEC Use Only
                         -------------------------------------------------------

(4)       Citizenship or Place of Organization          United States
                                                  ------------------------------

- - ---------------
Number of                (5)  Sole Voting Power                       0
  Shares                                               -------------------------
Beneficially             (6)  Shared Voting Power                1,000,000*
 Owned by                                              -------------------------
   Each                  (7)  Sole Dispositive Power                  0
Reporting                                              -------------------------
Person With              (8)  Shared Dispositive Power           1,000,000*
- - ---------------                                        -----------------------


(9)       Aggregate Amount Beneficially Owned by Each Reporting Person
                         1,000,000*
          ----------------------------------------------------------------------

(10)      Check if the Aggregate Amount in Row (9) Excludes Certain Shares
          (See Instructions)
                              --------------------------------------------------

(11)      Percent of Class Represented by Amount in Row (9)
                         8.48%
          ----------------------------------------------------------------------

(12)      Type of Reporting Person (See Instructions)       IN
                                                       -------------------------

          (*All shares underlie currently exercisable warrants)



                                    Page 4 of 7




Item 1.   Identity of Issuer

          This  Statement  on  Schedule  13G is  filed by the  undersigned  with
respect to the Common Stock, par value $0.001 per share (the "Common Stock"), of
Rentrak Corp.  (the  "Issuer").  The Issuer's  principal  executive  offices are
located at One Airport Center, 7700 NE Ambassador Place, Portland, Oregon 97220:



Item 2.   Identity of Reporting Persons and Background

          This  Statement  is filed on behalf of  Blockbuster  Videos,  Inc.,  a
Delaware  corporation  ("BVI")  with a  principal  address  of 1201 Elm  Street,
Dallas,  Texas 75270,  Blockbuster  Entertainment  Inc., a Delaware  corporation
("BEI") with a principal address of 1201 Elm Street, Dallas, Texas 75270, Viacom
International  Inc., a Delaware  corporation ("VII") with a principal address of
1515  Broadway,  New York New York 10036,  Viacom Inc.,  a Delaware  corporation
("VI")  with a principal  address of 1515  Broadway,  New York,  New York 10036,
National  Amusements,  Inc.,  a Maryland  corporation  ("NAI")  with a principal
address  of 200 Elm  Street,  Dedham,  MA  02026,  and Mr.  Sumner  M.  Redstone
(collectively, the "Reporting Persons").

          BVI is a wholly  owned  subsidiary  of BEI,  which in turn is a wholly
owned  subsidiary  of VII,  which in turn is a wholly  owned  subsidiary  of VI.
Approximately  67% of VI's voting stock is owned by NAI; Mr.  Sumner M. Redstone
is the controlling shareholder,  Chairman, Chief Executive Officer and President
of NAI, the Chairman and Chief  Executive  Officer of VI and President and Chief
Executive Officer of VII.



Item 3.   If this Statement is filed pursuant to Section 240.13d-1(c),
          check this box /X/.



Item 4.   Ownership.

          Each of BVI, BEI, VII, VI NAI and Mr. Sumner M. Redstone  beneficially
own the one million  (1,000,000)  shares of Common  Stock  underlying  currently
exercisable warrants reported hereunder, representing approximately 8.48% of the
outstanding  shares of  Common  Stock  (based on the  number of shares of Common
Stock outstanding as of December 31, 1997 as reported by the Issuer).

          Due to the  relationship of the Reporting  Person  described in Item 2
hereof,  each of the  Reporting  Persons  may be deemed to share with each other
Reporting  Person power (i) to vote or direct the vote and (ii) to dispose or to
direct the disposition of the shares of Common Stock covered by this Statement.



                                    Page 5 of 7




Item 5.   Ownership of Five Percent or Less of a Class.

          Not Applicable



Item 6.   Ownership of Five Percent on Behalf of Another Person.

          See Items 2 and 4 hereof



Item 7.   Identification and Classification of the Subsidiary Which Acquired
          the Security Being Reported on By the Parent Holding Company.

          Not Applicable



Item 8.   Identification and Classification of Members of the Group.

          Not Applicable



Item 9.   Notice of Dissolution of Group.

          Not Applicable





                                    Page 6 of 7




Item 10.  Certifications.

          By signing  below we certify  that,  to the best of our  knowledge and
belief, the securities  referred to above were not acquired and are not held for
the purpose of or with the effect of changing or influencing  the control of the
issuer of the  securities  and were not acquired and are not held in  connection
with or as a participant in any transaction having that purpose or effect.


          After reasonable  inquiry and to the best of our knowledge and belief,
we certify that the  information  set forth in this statement is true,  complete
and correct. Pursuant to Rule 13d-1(f)(1), we agree that this statement is filed
on behalf of each of us.


Date:  March 16, 1998
                                             BLOCKBUSTER VIDEOS, INC.


                                             /s/ MICHAEL D. FRICKLAS
                                             -----------------------------------
                                                  Michael D. Fricklas
                                                  Senior Vice President



                                             BLOCKBUSTER ENTERTAINMENT INC.


                                              /s/ MICHAEL D. FRICKLAS
                                             -----------------------------------
                                                  Michael D. Fricklas
                                                  Senior Vice President



                                             VIACOM INTERNATIONAL INC.


                                             /s/ MICHAEL D. FRICKLAS
                                             -----------------------------------
                                                  Michael D. Fricklas
                                                  Senior Vice President



                                             VIACOM INC.


                                             /s/ MICHAEL D. FRICKLAS
                                             -----------------------------------
                                                  Michael D. Fricklas
                                                  Senior Vice President and
                                                  Deputy General Counsel



                                             NATIONAL AMUSEMENTS, INC.


                                             /s/ Sumner M. Redstone
                                             -----------------------------------
                                                  Chairman, President and
                                                  Chief Executive Officer



                                             /s/ Sumner M. Redstone
                                             -----------------------------------
                                                  Sumner M. Redstone,
                                                  Individually



                                    Page 7 of 7