diff --git a/modules/seedtagBidAdapter.js b/modules/seedtagBidAdapter.js
index c25d833a71c..f4e99a2e2a0 100644
--- a/modules/seedtagBidAdapter.js
+++ b/modules/seedtagBidAdapter.js
@@ -46,7 +46,7 @@ function mapMediaType(seedtagMediaType) {
 }
 
 function hasVideoMediaType(bid) {
-  return !!bid.mediaTypes && !!bid.mediaTypes.video
+  return (!!bid.mediaTypes && !!bid.mediaTypes.video) || (!!bid.params && !!bid.params.video)
 }
 
 function hasMandatoryParams(params) {
@@ -58,13 +58,12 @@ function hasMandatoryParams(params) {
   );
 }
 
-function hasMandatoryVideoParams(mediaTypes) {
-  const isVideoInStream =
-    !!mediaTypes.video && mediaTypes.video.context === 'instream';
-  const isPlayerSize =
-    !!utils.deepAccess(mediaTypes, 'video.playerSize') &&
-    utils.isArray(utils.deepAccess(mediaTypes, 'video.playerSize'));
-  return isVideoInStream && isPlayerSize;
+function hasMandatoryVideoParams(bid) {
+  const videoParams = getVideoParams(bid)
+
+  return hasVideoMediaType(bid) && !!videoParams.playerSize &&
+    utils.isArray(videoParams.playerSize) &&
+    videoParams.playerSize.length > 0;
 }
 
 function buildBidRequests(validBidRequests) {
@@ -91,18 +90,33 @@ function buildBidRequests(validBidRequests) {
     }
 
     if (hasVideoMediaType(validBidRequest)) {
-      bidRequest.videoParams = params.video || {};
-      bidRequest.videoParams.w =
-        validBidRequest.mediaTypes.video.playerSize[0][0];
-      bidRequest.videoParams.h =
-        validBidRequest.mediaTypes.video.playerSize[0][1];
+      bidRequest.videoParams = getVideoParams(validBidRequest)
     }
 
     return bidRequest;
   })
 }
 
-function buildBid(seedtagBid) {
+/**
+ * return video param (global or overrided per bidder)
+ */
+function getVideoParams(validBidRequest) {
+  const videoParams = validBidRequest.mediaTypes.video || {};
+  if (videoParams.playerSize) {
+    videoParams.w = videoParams.playerSize[0][0];
+    videoParams.h = videoParams.playerSize[0][1];
+  }
+
+  const bidderVideoParams = (validBidRequest.params && validBidRequest.params.video) || {}
+  // override video params from seedtag bidder params
+  Object.keys(bidderVideoParams).forEach(key => {
+    videoParams[key] = validBidRequest.params.video[key]
+  })
+
+  return videoParams
+}
+
+function buildBidResponse(seedtagBid) {
   const mediaType = mapMediaType(seedtagBid.mediaType);
   const bid = {
     requestId: seedtagBid.bidId,
@@ -114,7 +128,10 @@ function buildBid(seedtagBid) {
     netRevenue: true,
     mediaType: mediaType,
     ttl: seedtagBid.ttl,
-    nurl: seedtagBid.nurl
+    nurl: seedtagBid.nurl,
+    meta: {
+      advertiserDomains: seedtagBid && seedtagBid.adomain && seedtagBid.adomain.length > 0 ? seedtagBid.adomain : []
+    }
   };
 
   if (mediaType === VIDEO) {
@@ -152,7 +169,7 @@ export const spec = {
    */
   isBidRequestValid(bid) {
     return hasVideoMediaType(bid)
-      ? hasMandatoryParams(bid.params) && hasMandatoryVideoParams(bid.mediaTypes)
+      ? hasMandatoryParams(bid.params) && hasMandatoryVideoParams(bid)
       : hasMandatoryParams(bid.params);
   },
 
@@ -197,7 +214,7 @@ export const spec = {
     const serverBody = serverResponse.body;
     if (serverBody && serverBody.bids && utils.isArray(serverBody.bids)) {
       return utils._map(serverBody.bids, function(bid) {
-        return buildBid(bid);
+        return buildBidResponse(bid);
       });
     } else {
       return [];
diff --git a/modules/seedtagBidAdapter.md b/modules/seedtagBidAdapter.md
index 627ff8333ad..f4249fb2e89 100644
--- a/modules/seedtagBidAdapter.md
+++ b/modules/seedtagBidAdapter.md
@@ -46,7 +46,19 @@ var adUnits = [{
   mediaTypes: {
     video: {
       context: 'instream',   // required
-      playerSize: [600, 300] // required
+      playerSize: [600, 300], // required
+      mimes: ['video/mp4'], // recommended
+      minduration: 5,       // optional
+      maxduration: 60,      // optional
+      boxingallowed: 1,     // optional
+      skip: 1,              // optional
+      startdelay: 1,        // optional
+      linearity: 1,         // optional
+      battr: [1, 2],        // optional
+      maxbitrate: 10,       // optional
+      playbackmethod: [1],  // optional
+      delivery: [1],        // optional
+      placement: 1,         // optional
     }
   },
   bids: [
@@ -57,9 +69,10 @@ var adUnits = [{
         adUnitId: '0000',               // required
         placement: 'video',             // required
         adPosition: 0,                  // optional
-        // Video object as specified in OpenRTB 2.5
-        video: {
-          mimes: ['video/mp4'], // recommended
+        video: { // optional
+          context: 'instream',   // optional
+          playerSize: [600, 300], // optional
+          mimes: ['video/mp4'], // optional
           minduration: 5,       // optional
           maxduration: 60,      // optional
           boxingallowed: 1,     // optional
diff --git a/test/spec/modules/seedtagBidAdapter_spec.js b/test/spec/modules/seedtagBidAdapter_spec.js
index c82c8300d2e..cb04ada59c7 100644
--- a/test/spec/modules/seedtagBidAdapter_spec.js
+++ b/test/spec/modules/seedtagBidAdapter_spec.js
@@ -55,7 +55,7 @@ describe('Seedtag Adapter', function() {
         })
       })
       describe('when video slot has all mandatory params', function() {
-        it('should return true, when video mediatype object are correct.', function() {
+        it('should return true, when video context is instream', function () {
           const slotConfig = getSlotConfigs(
             {
               video: {
@@ -72,6 +72,24 @@ describe('Seedtag Adapter', function() {
           const isBidRequestValid = spec.isBidRequestValid(slotConfig)
           expect(isBidRequestValid).to.equal(true)
         })
+
+        it('should return true, when video context is outstream', function () {
+          const slotConfig = getSlotConfigs(
+            {
+              video: {
+                context: 'outstream',
+                playerSize: [[600, 200]]
+              }
+            },
+            {
+              publisherId: PUBLISHER_ID,
+              adUnitId: ADUNIT_ID,
+              placement: 'video'
+            }
+          )
+          const isBidRequestValid = spec.isBidRequestValid(slotConfig)
+          expect(isBidRequestValid).to.equal(true)
+        })
       })
     })
     describe('returns false', function() {
@@ -137,7 +155,7 @@ describe('Seedtag Adapter', function() {
           )
           expect(isBidRequestValid).to.equal(false)
         })
-        it('is not instream ', function() {
+        it('is outstream ', function () {
           const isBidRequestValid = spec.isBidRequestValid(
             createVideoSlotConfig({
               video: {
@@ -146,7 +164,7 @@ describe('Seedtag Adapter', function() {
               }
             })
           )
-          expect(isBidRequestValid).to.equal(false)
+          expect(isBidRequestValid).to.equal(true)
         })
         describe('order does not matter', function() {
           it('when video is not the first slot', function() {
@@ -326,7 +344,8 @@ describe('Seedtag Adapter', function() {
                   height: 90,
                   mediaType: 'display',
                   ttl: 360,
-                  nurl: 'testurl.com/nurl'
+                  nurl: 'testurl.com/nurl',
+                  adomain: ['advertiserdomain.com']
                 }
               ],
               cookieSync: { url: '' }
@@ -342,6 +361,7 @@ describe('Seedtag Adapter', function() {
           expect(bids[0].netRevenue).to.equal(true)
           expect(bids[0].ad).to.equal('content')
           expect(bids[0].nurl).to.equal('testurl.com/nurl')
+          expect(bids[0].meta.advertiserDomains).to.deep.equal(['advertiserdomain.com'])
         })
       })
       describe('the bid is a video', function() {
@@ -374,6 +394,7 @@ describe('Seedtag Adapter', function() {
           expect(bids[0].currency).to.equal('USD')
           expect(bids[0].netRevenue).to.equal(true)
           expect(bids[0].vastXml).to.equal('content')
+          expect(bids[0].meta.advertiserDomains).to.deep.equal([])
         })
       })
     })