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*停權中*
加入日期: Sep 2001
文章: 1,933
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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
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2002-01-11, 07:18 AM
#1
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Major Member
 加入日期: Jul 2001
文章: 103
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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! |
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2002-01-11, 08:10 PM
#2
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Power Member
加入日期: Jan 2001 您的住址: taiwan
文章: 680
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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
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2002-01-12, 08:55 AM
#3
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Major Member
加入日期: Dec 2001 您的住址: 大台北地區
文章: 225
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到底是....??
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2002-01-12, 03:04 PM
#4
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