全金属狂潮 rmvb体积的疑问?

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我再看其中的2集时(是2个字幕组的版本),

同为rmvb
体积对比:    55M        vs   82M
Avg Bit Rate:  316.5 Kbps    vs   495.3 Kbps
体积大了不少,但画面反而模糊不少?


这是为什么呢?虚心请教 >_<




分别附上剪辑信息,供高手参考:

清楚的一集
RealVideo VBR Stream - Single Rate
File Name: è??eê???3±I 18.rmvb
Last Modified: Thu, 17 Mar 2005 10:28:32 GMT
File Size: 54,870,093 Bytes
Title: ′′òaDVD?¨í¨ì¨[è??eê?·?±?]
Author: XIAOHU/ CJGNEWGAME/GAMEZ88
Copyright:
Duration: 22:49.48
Buffer Time: 4.5 seconds
Max Bit Rate: 700.0 Kbps
Avg Bit Rate: 316.5 Kbps
Allow Download: on
Allow Recording: on
Perfect Play: disabled
Stream: 0 Audio Stream
MIME type: audio/x-pn-realaudio
Max Stream Bit Rate: 64.1 Kbps
Audio Codec: 64 Kbps Stereo Music - RealAudio (RealAudio 8) 44100 Khz
Stream: 1 Video Stream
MIME type: video/x-pn-realvideo
Max Stream Bit Rate: 635.9 Kbps
Avg Stream Bit Rate: 252.5 Kbps
Dimensions: 640x480
Encoded Frame Rate: 30.0 fps
Video Codec: 252.5 Kbps (RealVideo 9)
Stream Pairings
0.0 and above
Stream0Bandwidth = 64.1 Kbps
Stream1Bandwidth = 285.9 Kbps




模糊的另一集

Stream: RealVideo VBR Stream - Single Rate
File Name: è??eê???3±I 21.rmvb
Last Modified: Sun, 20 Mar 2005 09:09:48 GMT
File Size: 86,134,424 Bytes
Title: FULL METAL -021 P4 2.4 C
Author: [-X2-] CBUILDER
Copyright: (C) 2002
Duration: 22:49.48
Buffer Time: 3.7 seconds
Max Bit Rate: 1200.0 Kbps
Avg Bit Rate: 495.3 Kbps
Allow Download: on
Allow Recording: on
Perfect Play: disabled
Stream: 0 Audio Stream
MIME type: audio/x-pn-realaudio
Max Stream Bit Rate: 96.5 Kbps
Audio Codec: 96 Kbps Stereo Music - RealAudio (RealAudio 8) 44100 Khz
Stream: 1 Video Stream
MIME type: video/x-pn-realvideo
Max Stream Bit Rate: 1103.5 Kbps
Avg Stream Bit Rate: 398.8 Kbps
Dimensions: 640x480
Encoded Frame Rate: 30.0 fps
Video Codec: 398.8 Kbps (RealVideo 9)
Stream Pairings
0.0 and above
Stream0Bandwidth = 96.5 Kbps
Stream1Bandwidth = 407.5 Kbps.

xsy5618

压缩问题吧
55M那个画质肯定没有82M那个好了。