whisper在rk3588中推理的RTF为1.3左右，和介绍的RTF0.392不太一样

[Gooddz1]

-- init_whisper_decoder_model use: 221.897003 ms
-- read_mel_filters & read_vocab & read_audio use: 11.515000 ms
-- inference_whisper_model use: 7662.529785 ms

Whisper result: Mr. Quilter is the apostle of the middle classes and we are glad to welcome his gospel.

Real Time Factor (RTF): 7.663 / 5.855 = 1.309

[Gooddz1]

音频文件是model/test.wav

[jxx-xi]

需要定频后再测性能，请使用定频脚本(https://github.com/airockchip/rknn_model_zoo/blob/main/scaling_frequency.sh)，用法：./scaling_frequency.sh -c rk3588