Recording problem with Mini Program

the recording format is selected as aac, but the format of the output file is M4a.
const options = {

duration: 10000,
sampleRate: 16000,
numberOfChannels: 1,
encodeBitRate: 96000,
format: "aac",
frameSize: 50

}
recorderManager.start (options)

what"s going on? is there any way to change it to aac format?

Mar.29,2022
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