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About MP3 encode performance in DM368

MP3 encode version : mp3_3_5_00_production

SDK version : dvsdk3_10_00_19

CPU : DM368

test AP : dvsdk3_10_00_19/dvsdk_demo_3_10_00_16

enable audio code engine and ipmrement mp3 encode codec in to encode AP.

When run the encode ap and only encode audio , the cpu loading average in 80%

This is my command :

#./encode -a /mnt/tmp/1.mp3

And when i review the encode file , one channel is nosie , one channel is not right 1KHz waveform.

What do i need to check ?