User manual

MPEG-4 encoder settings 137
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(A)SP@L0-L5: (Advanced) Simple Profile in Level 0-5
(Q)CIF (Common Intermediate Format): CIF is a video format
produced as soon as 1990 with the video compression format H.261.
At that time, the format was used for video telephone conferences.
The "Q" in QCIF stands for "Quarter", and since resolution is halved in
terms of height and width compared to CIF, the entire size is only a
quarter of CIF.
QCIF was popular with mobile telephone manufacturers, since the
resolution of 176 x 144 pixels was sensible for the first affordable
SmartPhones (144 x 176).
(Half)D1: D1 corresponds with MPEG-2 DVD. HalfD1 has exactly half
of the entire number of pixels, meaning that the pixel number of the
height and weight is 2/3 of D1.
720p: Video stream with a resolution of 1280 x 720p (progressive).
Apple iPod: Apple iPod-compatible stream.
Sony PSP: Sony PSP-compatibler stream.
Profile/Level
So that profile and level are conformant with the other settings, pay
attention to the minimum and maximum values in the following tables.
Note! In case the settings are not included in this information,
problems playing back the encoded videos can lead to problems.
Table 1: The levels of the MPEG-4 simple profile (SP)
Level Typical
visual
session
size
Max.
number
of
objects
Maximum
number
objects per
type
Max.
unique
quant.
tables
Max. VMV buffer
size
(MB)
L0 QCIF 1 1 x simple 1 198
L1 QCIF 4 4 x simple 1 198
L2 CIF 4 4 x simple 1 792
L3 CIF 4 4 x simple 1 792