--- a/dom/media/mediasource/test/test_Sequence_mp4.html
+++ b/dom/media/mediasource/test/test_Sequence_mp4.html
@@ -17,23 +17,23 @@ runWithMSE(function(ms, v) {
     ok(true, "Receive a sourceopen event");
     ok(!receivedSourceOpen, "Should only receive one sourceopen for this test");
     receivedSourceOpen = true;
     var sb = ms.addSourceBuffer("video/mp4");
     ok(sb, "Create a SourceBuffer");
     sb.addEventListener('error', (e) => { ok(false, "Got Error: " + e); SimpleTest.finish(); });
     sb.mode = 'sequence';
 
-    fetchAndLoad(sb, 'bipbop/bipbop', ['init'], '.mp4')
-    .then(fetchAndLoad.bind(null, sb, 'bipbop/bipbop', ['2'], '.m4s'))
-    .then(fetchAndLoad.bind(null, sb, 'bipbop/bipbop', ['5'], '.m4s'))
+    fetchAndLoad(sb, 'bipbop/bipbop_video', ['init'], '.mp4')
+    .then(fetchAndLoad.bind(null, sb, 'bipbop/bipbop_video', ['5'], '.m4s'))
+    .then(fetchAndLoad.bind(null, sb, 'bipbop/bipbop_video', ['2'], '.m4s'))
     .then(function() {
         is(v.buffered.length, 1, "Continuous buffered range");
         is(v.buffered.start(0), 0, "Buffered range starts at 0");
-        ok(sb.timestampOffset < 0, "SourceBuffer.timestampOffset set to allow continuous range");
+        ok(sb.timestampOffset > 0, "SourceBuffer.timestampOffset set to allow continuous range");
         SimpleTest.finish();
       });
   });
 });
 </script>
 </pre>
 </body>
 </html>