Author(s)

Yen-Jen Chen¹, Yang-Jen Lin¹, Sheau-Ling Hsieh^2*

¹Department of Electronic Engineering, Ming Chi University of Technology, New Taipei city.
²Information Technology Service Center, National Chiao Tung University, Hsinchu.

The study applied a charge-coupled device (CCD) camera to send video signals to 4 DaVinci^TM development boards (TMS320DM6446) of Texas Instruments (TI) to carry out H.264 Baseline Profile video coding. One of the development boards coded in the Variable Bit Rate (VBR) mode, and the other three development boards coded in the Constant Bit Rate (CBR) mode. In addition, the constant rates are 2 Mbps, 1.5 Mbps and 1 Mbps respectively. The H.264 video compression files produced by the boards were analyzed via video analysis software (CodecVisa) in the study. This software can analyze and present the compression data characteristics of the video files under each video frame, i.e., bits/MB, QP, and PSNR. In this research, the characteristics of data of each frame under four different compression conditions were compared. Their differences were calculated and averaged, and the standard deviation was evaluated. It was further connected with the values of quality characteristics and the peak signal to noise ratio (PSNR) of each frame to analyze the relation among the frame quality, the compression rate of CBR, as well as the quantitative granularity. The preliminary conclusion of the study is that the compression behaviors of CBRs in different coding sources are adjusted in a specific proportion in order to cope with the change in frame complexity. The frame will be severely damaged by a critical value during the process of network transmission while the source rate is less than the value of the characteristic.

H.264 Video Coding, CodecVisa, PSNR, VBR, CBR, QP

Chen, Y. , Lin, Y. and Hsieh, S. (2016) Analysis of Video Quality Variation with Different Bit Rates of H.264 Compression. Journal of Computer and Communications, 4, 32-40. doi: 10.4236/jcc.2016.45005.