http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4
亲测可用，需等待一段时间，有点卡。
苹果提供的测试链接，等待时间更长，也能用。
苹果提供的测试源（点播）： http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8 http://devimages.apple.com/iphone/samples/bipbop/gear1/prog_index.m3u8 http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear2/prog_index.m3u8 bipbop basic master playlist http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/bipbop_4x3_variant.m3u8 bipbop basic 400x300 @ 232 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear1/prog_index.m3u8 bipbop basic 640x480 @ 650 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear2/prog_index.m3u8 bipbop basic 640x480 @ 1 Mbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear3/prog_index.m3u8 bipbop basic 960x720 @ 2 Mbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear4/prog_index.m3u8 bipbop basic 22.050Hz stereo @ 40 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_4x3/gear0/prog_index.m3u8 bipbop advanced master playlist http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/bipbop_16x9_variant.m3u8 bipbop advanced 416x234 @ 265 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear1/prog_index.m3u8 bipbop advanced 640x360 @ 580 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear2/prog_index.m3u8 bipbop advanced 960x540 @ 910 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear3/prog_index.m3u8 bipbop advanced 1280x720 @ 1 Mbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear4/prog_index.m3u8 bipbop advanced 1920x1080 @ 2 Mbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear5/prog_index.m3u8 bipbop advanced 22.050Hz stereo @ 40 kbps http://devimages.apple.com.edgekey.net/streaming/examples/bipbop_16x9/gear0/prog_index.m3u8