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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0001140888-05-000042.txt : 20050321
<SEC-HEADER>0001140888-05-000042.hdr.sgml : 20050321
<ACCEPTANCE-DATETIME>20050321114344
ACCESSION NUMBER:		0001140888-05-000042
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20050318
FILED AS OF DATE:		20050321
DATE AS OF CHANGE:		20050321

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SEACHANGE INTERNATIONAL INC
		CENTRAL INDEX KEY:			0001019671
		STANDARD INDUSTRIAL CLASSIFICATION:	RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT [3663]
		IRS NUMBER:				043197974
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0131

	BUSINESS ADDRESS:	
		STREET 1:		124 ACTON ST
		STREET 2:		2ND FLOOR
		CITY:			MAYNARD
		STATE:			MA
		ZIP:			01754
		BUSINESS PHONE:		9788970100

	MAIL ADDRESS:	
		STREET 1:		124 ACTON ST
		STREET 2:		SECOND FLOOR
		CITY:			MAYNARD
		STATE:			MA
		ZIP:			01754

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			BLACK BEAR OFFSHORE MASTER FUND LP
		CENTRAL INDEX KEY:			0001275688
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-21393
		FILM NUMBER:		05693441

	BUSINESS ADDRESS:	
		STREET 1:		CORPORATE CTR WEST BAY RD
		STREET 2:		PO BOX 31106-SMB
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			00000
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>primary_doc.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2005-03-18</periodOfReport>

    <notSubjectToSection16>0</notSubjectToSection16>

    <issuer>
        <issuerCik>0001019671</issuerCik>
        <issuerName>SEACHANGE INTERNATIONAL INC</issuerName>
        <issuerTradingSymbol>seac</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001275688</rptOwnerCik>
            <rptOwnerName>BLACK BEAR OFFSHORE MASTER FUND LP</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1></rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity></rptOwnerCity>
            <rptOwnerState></rptOwnerState>
            <rptOwnerZipCode></rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
                <footnoteId id="F1"/>
            </securityTitle>
            <transactionDate>
                <value>2005-03-18</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionTimeliness>
                <value></value>
            </transactionTimeliness>
            <transactionAmounts>
                <transactionShares>
                    <value>5900</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>12.4</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>3460441</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Black Bear Offshore Master Fund, L.P. (&quot;Filer&quot;) disclaims membership in a group with any other person within the meaning of Rule 13d-5(b)(i) and Rule 16a-1(a)(l) under the Securities Exchange Act of 1934, as amended.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Eric Sippel</signatureName>
        <signatureDate>2005-03-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
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