updating, false, "SourceBuffer.updating is false");
            assert_throws_js(TypeError,
                             function() {
                                 sourceBuffer.mode = "segments";
                             },
                             'SourceBuffer#mode with generate timestamps flag true');
        }), false);
        var video = document.createElement('video');
        video.src = window.URL.createObjectURL(mediaSource);
    }, mime + ' : ' +
       'If generate timestamps flag equ