Macがsleep中にffmpegを実行してもCPUがフル稼働しない

--メールからの呼び出し
set scriptPath to POSIX path of (((path to current user folder) as text) & "Library:Mobile Documents:com~apple~ScriptEditor2:Documents:MP4Enc.scpt")
do shell script "osascript " & quoted form of scriptPath & " > /dev/null 2>&1 &"

--本体
--MP4Enc.scpt
property outFolder : ((path to current user folder) as string) & "mp4:"
property recFolder : POSIX file "/Volumes/rec/"
property ffmpegPath : "/opt/homebrew/Cellar/ffmpeg/6.0/bin/ffmpeg"

on run
	set myPID to do shell script "ps aux | grep -i -e 'MP4Enc.scpt' | grep -i -v 'grep' | awk '{print $2}'"
	if myPID ≠ "" then do shell script "caffeinate -w " & myPID & " >/dev/null 2>&1 &"
	
	tell application "Finder" to set fileList to every file of folder recFolder whose name ends with "【SP】.ts"
	repeat with aFile in fileList
		set aFilePath to POSIX path of (aFile as string)
		tell application "Finder" to set aName to name of aFile
		set outFilePath to POSIX path of (outFolder & text 1 thru -4 of aName & ".mp4")
		try
			do shell script ffmpegPath & " -i " & quoted form of aFilePath & " -c:v libx264 -c:a aac -y " & quoted form of outFilePath
		end try
	end repeat
end run

do shell script "sudo pmset schedule wake \"$(date -j -v+3S \"+%m/%d/%y %H:%M:%S\")\"" user name "XXXX" password "XXXX" with administrator privileges