MPEG audio comes in various different flavours; it can be multi-channel digital audio, using lossy compression from original PCM format with sample rate of 48 kHz at 16 or 20 bits.
For DVD both MPEG-1 and MPEG-2 audio 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 rarely used 7.1 channel format adds left-center and right-center channels. |
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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) is suitable for audio download for mobile phone and devices such as apples I-Pod. It is not supported in DVD Video.
MPEG audio is rarly used on DVDs, although some inexpensive DVD recording software programs use MPEG audio. MPEG 1 layer 2 audio is not fully supported on NTSC discs.
For any MPEG audio encoding questions please contact client services for more information. |
