youtube上搬来的，仔细看吧，吧里肯定没发过的，前面几秒也不是纯黑的~~
请手动土豆原画画质以达到最佳观赏效果
明明是720p，居然说成768p...
下面给出上传源视频参数表
General
Complete name : Warfare 2 Official Trailer (HD 1280x768) - YouTube.mp4
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 41.3 MiB
Duration : 2mn 42s
Overall bit rate : 2 128 Kbps
Encoded date : UTC 2009-06-18 21:11:12
Tagged date : UTC 2009-06-18 21:11:12
gsst : 0
gstd : 163375
gssd : B4A7DD606MH1342521182331316
gshh : o-o.preferred.iad23t01.v6.cache1.c.youtube.com
Video
ID : 2
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L3.1
Format settings, CABAC : Yes
Format settings, ReFrames : 3 frames
Codec ID : avc1
Codec ID/Info : Advanced Video Coding
Duration : 2mn 42s
Bit rate : 1 999 Kbps
Maximum bit rate : 6 238 Kbps
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 29.970 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.072
Stream size : 38.8 MiB (94%)
Title : (C) 2007 Google Inc. v08.13.2007.
Encoded date : UTC 2009-06-18 21:11:12
Tagged date : UTC 2009-06-18 21:11:13
Audio
ID : 1
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 2mn 42s
Bit rate mode : Variable
Bit rate : 125 Kbps
Maximum bit rate : 278 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 2.44 MiB (6%)
Title : (C) 2007 Google Inc. v08.13.2007.
Encoded date : UTC 2009-06-18 21:11:12
Tagged date : UTC 2009-06-18 21:11:13