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CCS/TMS320C6678: Problem in H.265 bitrate control

Part Number: TMS320C6678

Tool/software: Code Composer Studio

I am using the example project h265venc_02_00_00_02_ELF in mcsdk_video_02_02_00_46 to compress H.265 bitstream on C6678, but I find it hard to achieve accurate bitrate control, I only modified the following para in the encoder.cfg file. Please help me, thanks a lot!

inputYUVFile = "ChinaSpeed_1024x768_30.yuv"

rateControlPreset = 1 # 1: CBR

inputWitdh = 1024

inputHeight = 768

targetBitRate = 2000000