diff --git a/cms/djangoapps/contentstore/tests/test_transcripts_utils.py b/cms/djangoapps/contentstore/tests/test_transcripts_utils.py
index 3cdf01e543..1f2cdef395 100644
--- a/cms/djangoapps/contentstore/tests/test_transcripts_utils.py
+++ b/cms/djangoapps/contentstore/tests/test_transcripts_utils.py
@@ -9,6 +9,7 @@ from mock import patch, Mock
 from django.test.utils import override_settings
 from django.conf import settings
 from django.utils import translation
+from django.utils.crypto import get_random_string
 
 from nose.plugins.skip import SkipTest
 
@@ -230,6 +231,17 @@ class TestDownloadYoutubeSubs(SharedModuleStoreTestCase):
         self.assertEqual(html5_ids[2], 'baz.1.4')
         self.assertEqual(html5_ids[3], 'foo')
 
+    def test_html5_id_length(self):
+        """
+        Test that html5_id is parsed with length less than 255, as html5 ids are
+        used as name for transcript objects and ultimately as filename while creating
+        file for transcript at the time of exporting a course.
+        Filename can't be longer than 255 characters.
+        150 chars is agreed length.
+        """
+        html5_ids = transcripts_utils.get_html5_ids([get_random_string(255)])
+        self.assertEqual(len(html5_ids[0]), 150)
+
     @patch('xmodule.video_module.transcripts_utils.requests.get')
     def test_fail_downloading_subs(self, mock_get):
 
diff --git a/cms/static/js/spec/video/transcripts/utils_spec.js b/cms/static/js/spec/video/transcripts/utils_spec.js
index f9ca4e6ae9..b5f448989d 100644
--- a/cms/static/js/spec/video/transcripts/utils_spec.js
+++ b/cms/static/js/spec/video/transcripts/utils_spec.js
@@ -215,6 +215,42 @@ function($, _, Utils, _str) {
                     });
                 });
             });
+
+            describe('Too long arguments ', function() {
+                var longFileName = (function() {
+                        var text = '';
+                        var possibleChars = 'abcdefghijklmnopqrstuvwxyz';
+                        /* eslint vars-on-top: 0 */
+                        for (var i = 0; i < 255; i++) {
+                            text += possibleChars.charAt(Math.floor(Math.random() * possibleChars.length));
+                        }
+                        return text;
+                    }()),
+                    html5LongUrls = (function(videoName) {
+                        var links = [
+                            'http://somelink.com/%s?param=1&param=2#hash',
+                            'http://somelink.com/%s#hash',
+                            'http://somelink.com/%s?param=1&param=2',
+                            'http://somelink.com/%s',
+                            'ftp://somelink.com/%s',
+                            'https://somelink.com/%s',
+                            'https://somelink.com/sub/sub/%s',
+                            'http://cdn.somecdn.net/v/%s',
+                            'somelink.com/%s',
+                            '%s'
+                        ];
+                        return $.map(links, function(link) {
+                            return _str.sprintf(link, videoName);
+                        });
+                    }(longFileName));
+
+                $.each(html5LongUrls, function(index, link) {
+                    it(link, function() {
+                        var result = Utils.parseHTML5Link(link);
+                        expect(result.video.length).toBe(150);
+                    });
+                });
+            });
         });
 
         it('Method: getYoutubeLink', function() {
diff --git a/cms/static/js/views/video/transcripts/utils.js b/cms/static/js/views/video/transcripts/utils.js
index 4945d87801..4c2d74fc83 100644
--- a/cms/static/js/views/video/transcripts/utils.js
+++ b/cms/static/js/views/video/transcripts/utils.js
@@ -110,6 +110,7 @@ define(['jquery', 'underscore', 'jquery.ajaxQueue'], function($) {
      */
         var _videoLinkParser = (function() {
             var cache = {};
+            var maxVideoNameLength = 150;
 
             return function(url) {
                 if (typeof url !== 'string') {
@@ -129,7 +130,10 @@ define(['jquery', 'underscore', 'jquery.ajaxQueue'], function($) {
                 match = link.pathname.match(/\/{1}([^\/]+)\.([^\/]+)$/);
                 if (match) {
                     cache[url] = {
-                        video: match[1],
+                        /* avoid too long video name, as it will be used as filename for video's transcript
+                        and a filename can not be more that 255 chars, limiting here to 150.
+                        */
+                        video: match[1].slice(0, maxVideoNameLength),
                         type: match[2]
                     };
                 } else {
@@ -139,7 +143,7 @@ define(['jquery', 'underscore', 'jquery.ajaxQueue'], function($) {
                     match = link.pathname.match(/\/{1}([^\/\.]+)$/);
                     if (match) {
                         cache[url] = {
-                            video: match[1],
+                            video: match[1].slice(0, maxVideoNameLength),
                             type: 'other'
                         };
                     }
diff --git a/common/lib/xmodule/xmodule/video_module/transcripts_utils.py b/common/lib/xmodule/xmodule/video_module/transcripts_utils.py
index f464a9d1db..22d6786e3b 100644
--- a/common/lib/xmodule/xmodule/video_module/transcripts_utils.py
+++ b/common/lib/xmodule/xmodule/video_module/transcripts_utils.py
@@ -296,9 +296,11 @@ def copy_or_rename_transcript(new_name, old_name, item, delete_old=False, user=N
 def get_html5_ids(html5_sources):
     """
     Helper method to parse out an HTML5 source into the ideas
-    NOTE: This assumes that '/' are not in the filename
+    NOTE: This assumes that '/' are not in the filename.
+    Slices each id by 150, restricting too long strings as video names.
     """
-    html5_ids = [x.split('/')[-1].rsplit('.', 1)[0] for x in html5_sources]
+    html5_ids = [x.split('/')[-1].rsplit('.', 1)[0][:150] for x in html5_sources]
+
     return html5_ids