DivX/ MPEG4: Feature Specification ver 1.0
DivX/ MPEG4 Feature List
DivX Playback on the
DVDR-X30
Product Overview
MPEG-4
The ISO/IEC 14496/ MPEG-4 is an international video standard characterized by superior flexibility and scaling. Its
usefulness spans from low to intermediate bit rates, delivering a competitive advantage over other standards. MPEG-4
offers a variety of profiles, useful for specific applications. The most commonly used profiles are Simple Profile (SP)
and Advanced Simple Profile (ASP). Due to its similarity with the MPEG-2 standard, support for MPEG-4 is feasible
without adding extra cost to the existing silicon and system infrastructures.
DivX3.11
DivX3.11 is a format that has come from an early submission of the MPEG-4 standard to the ISO/ITU committee.
Because DivX3.11 was created before the ratification of the MPEG-4 standard, it is not
primarily based on MPEG-4 simple profile with significant differences in coding tables.
MPEG-4 compliant. It is
DivX4.x, DivX5.x, DivXPro
In early 2000, DivX Networks created an open-source MPEG-4 CODEC known as DivX4.0 enabling content distribution
on the Internet. DivXNetworks later decided to close the source code distribution, and released DivX5.0 which was an
improved CODEC compared to DivX4.0. Both DivX4.0 and DivX5.0 are based on MPEG-4 Simple Profile and the
CODEC can be downloaded without a charge. Next the company released DivXPro, which is based on the MPEG-4
Advanced Simple Profile (ASP). DivXNetworks later removed the requirements for the supp ort of quarter-pixel (Qpel)
and global motion compensation (GMC) which is now termed ASP*.
Xvid
XviD (DivX spelled backwords) is an open-source alternative to DivX that is a fully compliant MPEG-4 CODEC based on
Simple Profile and Advanced Simple Profile tools, and is designed for cross-platform com patibility. XviD is not officially
sponsored by any corporations, and is a continuously-evolving implementation of the MPEG-4 CODEC.
Feature Summary for DivX Formats
DivX3.11 Simple Profile
(DivX4.0, DivX5.02)
Coding of I and P
frames
DC prediction is
different
Block based motion
compensation (16x16
blocks)
Different VLD tables Optimized VLD tables Optimized VLD tables Optimized VLD tables
No interlaced support No interlaced support Includes interlaced
½ pixel accurate
motion compensation
Coding of I and P frames Coding of I, P and B
AC/ DC prediction AC/ DC prediction AC/ DC prediction
Block based motion
compensation (16x16,
8x8 blocks)
½ pixel accrate motion
compensation
ASP*
(DivX5.1, DivX Pro)
frames
Block based motion
compensation
(16x16, 8x8 blocks)
support
½ pixel accurate
motion compensation
ASP, Advanced
Simple Profile (XviD)
Coding of I,P and B
frames
Global Motion
Compensation (GMC)
Includes interlaced
support
¼ pixel accurate motion
compensation
DivX/ MPEG4: Feature Specification ver 1.0
Below are the DivX playback specifications that LSI Logic supports on the DVDR-X30
Video Stream Formats:
DivX3.11
Simple Profile (SP) - DivX4.x,
DivX5.02
Advanced Simple Profile Star (ASP*)
- DivX5.1, DivX Pro
XviD Basic (no GMC or Qpel support)
MP4 File Format (alpha
release)(partial support)
B-pictures supported
Interlaced and Progressive source
supported
4xMV and dual-quantization modes
supported
Audio Stream Formats:
MP3
MP2
LPCM(partial support
AC3
WMA
AAC(partial support)
Note: DivX Certification requires the support of
both MP2 and MP3 files, although MP3 provides
the best performance of the audio formats listed
above. It is estimated that over 90% of all DivX
content available uses MP3.
File Format:
AVI
MP4 (partial support)
ASF (limited content)(NG)
Ogg (limited content)(NG)
DIVX
Logical Formats:
CD-R/ -RW (homogeneous content)
DVD +R/+RW (homogeneous
content)
Bit Rate:
Average bit rate: 2Mbps
Maximum macroblocks per second:
40500 MCBPS
Note: For additional information on DivX, please see the DivX website: http://www.divx.com/
Maximum peak bitrate: 2.5Mbps <
1/2 second
Input Stream Resolution:
Minimum: 200x100(orginal is
176x128 , Kourosh suggest to reduct
to 200x100)@ 30 fps (all streams
between the resolutions of 176x128
and 352x288 (SIF) will be supported
at 30 fps)
Maximum: 720x480 @ 30 fps and
720x576 @ 25 fps
Input Frame Rate:
All frame rates between 8 to 29.97 fps
will be decodable (pending
compliance to maximum MCBPS)
Display:
Frame rate: Streams will be played
back at either a or 29.97 (NTSC) or
25 (PAL) fps
Resolution: 720x480 (NTSC) and
720x576(PAL)
Trickplay:
Pause
Fast Forward (I-frame only) 8x, 16x,
32x
Fast Reverse (I-frame only) 8x, 16x,
32x
Subtitle Support:
External subtitles
Other:
Progressive Scan video output
supported (480P, 576P)
(Can’t switch Progressive/Interlace
when playing Divx)
NTSC to PAL Transcode
PAL to NTSC Transcode
Four CC codes supported: MP4,
mpg4, divx3, DivX50, MP43, mp43,
XVID, xvid , DIVX, divx
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