--è ·å  å¾…å¤ ç  ç  MP4æ  ä»¶ç  è·¯å¾ 
set videoFile to choose file with prompt "è¯·é  æ ©é  è¦ è½¬æ ¢ä¸ºé ³é¢ ç  MP4æ  ä»¶" of type {"mp4"}

--è®¾ç½®é ³é¢ æ  ä»¶ä¿ å­ è·¯å¾ 
set audioFile to (choose folder with prompt "è¯·é  æ ©é ³é¢ æ  ä»¶ä¿ å­ ç  ç ®å½ ") as text & (name of videoFile) & ".m4a"

--ä½¿ç ¨QuickTime Playerå° MP4ç¼ ç  ä¸ºM4A
tell application "QuickTime Player"
    set video to open videoFile
    set audioRecording to new audio recording
    tell audioRecording
        start
        set delayTime to 5
        delay delayTime
        stop
        export document 1 in file audioFile using settings preset "Audio Only"
    end tell
    close video saving no
end tell

--ä½¿ç ¨Adobe Auditionæ  å¼ M4A并以MP3æ ¼å¼ ä¿ å­ 
tell application "Adobe Audition 2020"
    open file audioFile
    set mp3File to (choose file name with prompt "è¯·é  æ ©MP3æ  ä»¶ä¿ å­ ç  ç ®å½ " default name (name of audioFile) default location (path to desktop))
    with timeout of 300 seconds
        save active document in file mp3File as MP3 with options {bit rate:192, channels:2, sample rate:44100}
    end timeout
    close active document saving no
end tell