User manual

MPEG-4 encoder settings 139
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Continuation of table 2
Level Max.
percentage
of intra
MBs with
AC
prediction
in VCV
buffer
Max total
VBV
buffer size
(units of
16384 bit
s)
Max. VOL
VBV
buffer size
(units of
16384 bit
s)
Max.
video
packet
length
(bits)
Max.
bitrate
(kbit/s)
L0 100 10 10 2048 128
L1 100 10 10 2048 128
L2 100 40 40 4096 384
L3 100 40 40 4096 768
L4 50 80 80 8192 3000
L5 25 112 112 16384 8000
Picture type
"Picture type" specifies which parts of a frame should be used as the
basis for the encoding:
• Frame: A frame is a single image from a video sequence, also called
a full image.
• Field: A half-image, two of which combine to produce a frame. Read
more about this explanation regarding "Interlace (view page 131)".
Field order
Note: This parameter is only available if the setting "Field" is selected
for "Picture type".
In case of interlaced streams, the half-image sequence is set. Read
more about this explanation regarding "Interlace (view page 131)".
Pulldown
Note: This parameter is only available if the setting "Frame" or
"MBAFF" (only for AVC/H.264)" is selected for "Picture type".
In normal cases, an image playback rate of 24 (or 23.976) frames per
second is use; the NTSC system however requires 30 (or 29.97)
frames/s, and there is a special algorithm for converting the video's
frame rate. For compilations or test purposes, switch this option to
"No". In normal cases, the setting can be set to "Auto".