svcd如何含dolby音效
 

原本有dolby surround的dvd影片,用dvd2avi+vfapi+virtualdub+vobsub+tmpeg轉成svcd後,卻只剩下stereo,svcd不是可有保有2個track,有麼辦法可保持原本的音效,還是說原本就是如此

SVCD不支援Dolby
 

以下是由中國電子部發表的超級VCD規格書摘錄的：
1. 最多2種音軌（DVD最多為8種）
2. 支援音軌格式如下：MPEG-1 Layer2 2ch及MPEG-2 7.1 multi-channel(DVD支援MPEG-1 Layer2 2ch, MPEG-2 7.1 Multi-channel, Dolby Digital 5.1ch, PCM 2ch, DTS 5.1ch, Sony SDDS 5.1ch)

死心吧!

以philips的svcd聲音規格來說:

MPEG-1 layer II
44.1 KHz
from 32 to 384 Kbps
up to 2 stereo or 4 mono
MPEG-2 ( 5+1 ) extension


而在dvd2avi的readme中提到:
The difference between Conventional Stereo and [Dolby Surround Downmix].
Conventional Stereo (5.1->2ch)
Lo = L + c' * C + s' * Ls (+ lfe' * LFE)
Ro = R + c' * C + s' * Rs (+ lfe' * LFE)
Dolby Surround Downmix (5.1->2ch)
Ls + Rs -> 7KHz low-pass filter (in order to obey the DS spec) -> S
Lt = L + c" * C - s" * S (+ lfe" * LFE)
Rt = R + c" * C + s" * S (+ lfe" * LFE)

Lt, Rt -> Pro-Logic rematrixing (inverse computation) -> L, R, C, S (2->4ch)

故svcd是可含Dolby Surround Pro-Logic 的

到底是....??