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2.6 Relationship between sector rate and bit rate

The in the
file definition line defines the sector rate, and the Mpeg stream defines the bit rate, but the relationship between the two was not described in the manual. The
Arbitrary integer values ​​can be defined for the sector rate, but there are two typical values: 75 sectors / second and 150 sectors / second. The bit rate (CD rate) that can be described in each case is
  • CD rate (75) = 75 x 2324 x 8 = 1,394,400 (bps)
  • CD rate (150) = 150 x 2324 x 8 = 2,788,800 (bps)
It becomes.

This means the maximum sum of bit rates that can be described in ......... . If this sum of bit rates exceeds this maximum value, the stream cannot be multiplexed.
When the disc format conforms to CD-ROM XA, the data length per sector that can be used in MPEG multiplex varies depending on the data type and is as follows.

  • MPEG video: 2296 bytes
  • MPEG audio: 2279
  • data (FORM1): 2048
  • Data (FORM2): 2324

Therefore, the following conversion is required between the bit rate defined by the keyword and the CD rate.

The MPEG video bit rate is BR (MV), the MPEG audio is BR (MA), the data (FORM1) bit rate is BR (F1), and the data (FORM2) is BR (F2).

It becomes the relationship.
This relationship must always hold in multiplex, it is checked at runtime, and an error occurs if it violates.
Up to 10 streams can be MPEG multiplexed.

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