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2004 Jan 26 50
Philips Semiconductors Product specification
MPEG-2 video and MPEG-audio/AC-3
audio encoder with multiplexer
SAA6752HS
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Table 21 I
2
C-bus video encoder: bit rate control (dynamic settings)
Note
1. If the video bit rate Rmax is intended to be changed during the encoding state, the maximum applied value for Rmax has to be set before start of
encoding. I.e. the Rmax value that was valid at start of encoding (coming from stop) is the maximum allowed value for this encoding process.
ADR
HEX
M COMMAND NAME R/W SIZE/POSITION PARAMETER/RANGE DEFAULT DESCRIPTION
80 I, E, P,
S
Rvbr R/W 2 bytes − 6000 VBR target bit rate (kbit/s); this applies to
VBR mode only; Rvbr must be set to less
than Rmax.
81 I, E, P,
S
Rmax R/W 2 bytes − 9800 CBR mode: Target bit rate (kbit/s);
VBR mode: Maximum bit rate (kbit/s);
note 1.
82 I, E, P,
S
Qmin_VBR R/W 1 byte 1 to 112 4 Minimum Q-scale for external constraints of
VBR
83 I, E, P,
S
Qmax_VBR R/W 1 byte 1 to 112 12 Maximum Q-scale for external constraints of
VBR.
84 I, E, P,
S
B-frame weighting R/W 1 byte 32 to 128 128, no
weighting
B-frame weighting factor (internally divided
by 128; i.e. 128 = no effect)
85 I, E, P,
S
read bytes per GOP R 4 bytes −−This command reads the number of bytes
per GOP.