User`s manual

80 Reference Manual
lambda
The factor determining stream quality. Its value range is [0,
100]. The larger the value, the smoother the stream however,
the quality of each frame decreases. This is inversely true for
smaller values. However, due to frame drops, the entire video
stream would appear “jumpy”.
Q
Initial quantizer. This value is divided by four.
X 0: If target_bitrate>0, apply constant bitrate control. The ini-
tial quantizer value is calculated. If target_bitrate=0, no
bitrate control algorithm is applied. Use IQ, PQ, and BQ
values provided by the user to determine the bitrate
value.
X >0: If target_bitrate is set to 0, apply VBR (variable bitrate)
using the value of Q. If target_bitrate is greater than 0,
apply CBR (constant bitrate) using the value of
target_bitrate.
IQ
The fixed quantized scale for I-frames during the entire encod-
ing session. This member is valid only when Q and
target_bitrate are both set to ‘0’.
PQ
The fixed quantized scale for P-frames during the entire encod-
ing session. This member is valid only when Q and
target_bitrate are both set to ‘0’.
BQ
The fixed quantized scale for B-frames during the entire encod-
ing session. This member is valid only when Q and
target_bitrate are both set to ‘0’.