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
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1bf3af4-31eae.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1bf3af4-31eae.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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