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TM

MPEG
Stream Build
Precautions
Doc. # ST-129-R2-SP2-082495© 1995 SEGA. All Rights Reserved.

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MPEG Stream Build Precautions

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MPEG Stream Build Precautions

Precautions:ntialThe following are precautions to be taken when building an MPEG stream.

When a disc builder is used to build an MPEG stream file, dummy data (emptysectors) is filled in the file equivalent in size to the difference between the sector rate
and bit rate. This creates the following problems:(a)(b)

The resulting file size is larger than necessary.
Pre-reads to the CD buffer become ineffective.

deSelect the smallest sector rate permitted by the range given below to delete empty
sectors. In other words, the sector rate should be the smallest possible value, butlarger than the total bit rate.
sector rate ≥ sum of all bit rates

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Please refer to section 2.6, The Relationship between Sector Rates and Bit Rates on page
16 of the Virtual CD System Supplementary Manual (ST-129-R2-SP1-061995) for information on how to calculate the sector rate.

CoFurthermore, the Virtual CD System Supplementary Manual only gives an equationthat yields values in bit units (CD rate). Use the following equation to determine thesector rate value.

SEGA

sector rate ≥ [BR(NV)/2296+BR(NA)/2279+BR(F1)/2048+BR(F2)/2324]/8

MPEG Stream Build Precautions

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