Wintal dvdr-x30 Guia De Especificação

 

 

 

 

 

 

 

 

   
 

 
 
 
 
 
 
 
 
 

 
 
 
 

 

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 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 MPEG-4 compliant.  It is 
primarily based on MPEG-4 simple profile with significant differences in coding tables.   

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 support of quarter-pixel (Qpel) 
and global motion compensation (GMC) which is now termed ASP*.  

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 compatibility.  XviD is not officially 
sponsored by any corporations, and is a continuously-evolving implementation of the MPEG-4 CODEC. 

 

 

Coding of I and P 
frames 

Coding of I and P frames 

Coding of I, P and B 
frames 

Coding of I,P and B 
frames 

DC prediction is 
different 

AC/ DC prediction 

AC/ DC prediction 

AC/ DC prediction 

Block based motion 
compensation (16x16 
blocks) 

Block based motion 
compensation (16x16, 
8x8 blocks) 

Block based motion 
compensation 
(16x16, 8x8 blocks) 

Global Motion 
Compensation (GMC) 

Different VLD tables 

Optimized VLD tables 

Optimized VLD tables  Optimized VLD tables 

No interlaced support 

No interlaced support 

Includes interlaced 
support 

Includes interlaced 
support 

½ pixel accurate 
motion compensation 

½ pixel accrate motion 
compensation 

½ pixel accurate 
motion compensation 

¼ pixel accurate motion 
compensation