想把一个500M的视频压缩到200M以内,尽量保持其清晰度,尤其是是音频的效果,应当如何设置参数呢?
以下是“原视频”的部分参数:
General
Format : MPEG-4
Format profile : Base Media / Version 2
Codec ID : mp42
File size : 543 MiB
Duration : 5mn 26s
Overall bit rate : 13.9 Mbps
Writing application : mp4creator 1.6.1d
Video
ID : 1
Format : MPEG-4 Visual
Format profile : Simple@L1
Format settings, BVOP : No
Format settings, QPel : No
Format settings, GMC : No warppoints
Format settings, Matrix : Default (H.263)
Codec ID : 20
Duration : 5mn 26s
Bit rate mode : Variable
Bit rate : 13.8 Mbps
Maximum bit rate : 15.5 Mbps
Width : 1 920 pixels
Height : 1 080 pixels
Display aspect ratio : 16:9
Frame rate mode : Constant
Frame rate : 50.000 fps
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Compression mode : Lossy
Bits/(Pixel*Frame) : 0.133
Stream size : 538 MiB (99%)
Language : English
Audio
ID : 2
Format : AAC
Format/Info : Advanced Audio Codec
Format profile : LC
Codec ID : 40
Duration : 5mn 26s
Bit rate mode : Variable
Bit rate : 126 Kbps
Maximum bit rate : 148 Kbps
Channel(s) : 2 channels
Channel positions : Front: L R
Sampling rate : 44.1 KHz
Compression mode : Lossy
Stream size : 4.89 MiB (1%)
Language : English
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