One-Pass Variable Bit Rate MPEG2 Video Coding Method for Digital Video Recording
Satoshi Kondo, Hideki Fukuda · Japanese Journal of Applied Physics · 1998
A real-time coding that performs, in one coding pass, a variable bit rate coding that capitalizes on the MPEG2 video coding is proposed. In this method, the relationship between quantization scale and generated bits is modeled as a function to assign bit amounts. Based on this bit amount assignment function, the quantization scale is determined for each picture frames and coding is performed with this quantization scale. To verify this method, computer simulations were performed and MPEG2 real-time encoders were built to serve as the hardware of this method. From the results, it was confirmed that: 1. this method's assignment of bit amounts is executed in a similar fashion to that achieved in conventional 2-pass variable bit rate coding; 2. image quality can greatly be improved over the quality achieved in constant bit rate coding; and 3. coding performance remains stable even over extensive coding durations.