./ http://dash.edgesuite.net/akamai/test/caption_test/ElephantsDream/ElephantsDream_en.vtt ED_SD_480p_reenc-avc1.42c01e-0s-848x480-h264-1500000bps_seg.mp4 ED-CM-5.1-DVD_length_fixed-653s-6-heaac-320000bps_seg.mp4 ED-CM-5.1-DVD_length_fixed-653s-6-heaac-192000bps_seg.mp4 ED-CM-5.1-DVD_length_fixed-653s-6-heaac-64000bps_seg.mp4 ED-CM-5.1-DVD_length_fixed-653s-6-heaac-128000bps_seg.mp4 ED-CM-5.1-DVD_length_fixed-653s-6-heaac-96000bps_seg.mp4