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Advance Member
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引用:
Originally posted by mkmoney
NTSC DVD只有LPCM音訊及AC-3,
MPEG-1 Layer2 Audio(mp2)並不是NTSC DVD的標準,
並不是所有NTSC DVD player都支援MPEG-1 Layer2 Audio(mp2),
只有PAL DVD才有將MPEG-1 Layer2 Audio(mp2)列入標準.
MPEG audio is multi-channel digital audio, using lossy compression from original PCM format with sample rate of 48 kHz at 16 or 20 bits. Both MPEG-1 and MPEG-2 formats are supported. The variable bit rate is 32 kbps to 912 kbps, with 384 being the normal average rate. MPEG-1 is limited to 384 kbps. Channel combinations are (front/surround): 1/0, 2/0, 2/1, 2/2, 3/0, 3/1, 3/2, and 5/2. The LFE channel is optional with all combinations. The 7.1 channel format adds left-center and right-center channels, but is rare for home use. MPEG-2 surround channels are in an extension stream matrixed onto the MPEG-1 stereo channels, which makes MPEG-2 audio backwards compatible with MPEG-1 hardware (an MPEG-1 system will only see the two stereo channels.) MPEG Layer 3 (MP3) and MPEG-2 AAC (also known as NBC or unmatrix) are not supported by the DVD-Video standard. MPEG audio is not used much on DVDs, although some inexpensive DVD recording software programs use MPEG audio, even on NTSC discs, which goes against the DVD standard and is not supported by all NTSC players.
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先說一下,我沒有把上面的文全部看完
不過我家的dvd可以 |