音视频是否可以直接在浏览器中播放取决于浏览器对该格式视频的支持，如果不支持就直接下载了，可以通过url?avinfo 查看视频源信息，http://7xrsps.com1.z0.glb.clouddn.com/video_test.mp4?avinfo
看以查看到该格式并不是MP4格式，而是wmav2，一般浏览器不支持这种格式，可以使用七牛的音视频处理服务进行转码为MP4格式，

http://developer.qiniu.com/code/v6/api/dora-api/index.html#av

{
streams: [
{
index: 0,
codec_name: "wmav2",
codec_long_name: "Windows Media Audio 2",
codec_type: "audio",
codec_time_base: "1/44100",
codec_tag_string: "a[1][0][0]",
codec_tag: "0x0161",
sample_fmt: "fltp",
sample_rate: "44100",
channels: 2,
bits_per_sample: 0,
r_frame_rate: "0/0",
avg_frame_rate: "0/0",
time_base: "1/1000",
start_pts: 0,
start_time: "0.000000",
duration_ts: 30093,
duration: "30.093000",
bit_rate: "192040",
disposition: {
default: 0,
dub: 0,
original: 0,
comment: 0,
lyrics: 0,
karaoke: 0,
forced: 0,
hearing_impaired: 0,
visual_impaired: 0,
clean_effects: 0,
attached_pic: 0
},
tags: {
language: "eng"
}
},
{
index: 1,
codec_name: "vc1",
codec_long_name: "SMPTE VC-1",
profile: "Advanced",
codec_type: "video",
codec_time_base: "1/1000",
codec_tag_string: "WVC1",
codec_tag: "0x31435657",
width: 1280,
height: 720,
has_b_frames: 1,
sample_aspect_ratio: "0:1",
display_aspect_ratio: "0:1",
pix_fmt: "yuv420p",
level: 3,
chroma_location: "left",
r_frame_rate: "30000/1001",
avg_frame_rate: "30000/1001",
time_base: "1/1000",
start_pts: 0,
start_time: "0.000000",
duration_ts: 30093,
duration: "30.093000",
bit_rate: "5942130",
disposition: {
default: 0,
dub: 0,
original: 0,
comment: 0,
lyrics: 0,
karaoke: 0,
forced: 0,
hearing_impaired: 0,
visual_impaired: 0,
clean_effects: 0,
attached_pic: 0
},
tags: {
language: "eng"
}
}
],
format: {
nb_streams: 2,
nb_programs: 0,
format_name: "asf",
format_long_name: "ASF (Advanced / Active Streaming Format)",
start_time: "0.000000",
duration: "30.093000",
size: "26246026",
bit_rate: "6977310",
probe_score: 100,
tags: {
SfOriginalFPS: "299700",
WMFSDKVersion: "11.0.6001.7000",
WMFSDKNeeded: "0.0.0.0000",
comment: "Footage: Small World Productions, Inc; Tourism New Zealand | Producer: Gary F. Spradling | Music: Steve Ball",
title: "Wildlife in HD",
copyright: "漏 2008 Microsoft Corporation",
IsVBR: "0",
DeviceConformanceTemplate: "AP@L3"
}
}
}

放在网页<video>标签里面，可以播放。

猜测应该是mimeType设置不正确，设置成视频的mimeType值，再试试。 具体mimeType值，请自行百度。