@echo off
chcp 65001 >nul
rem https://qastack.cn/superuser/579008/add-1-second-of-silence-to-audio-through-ffmpeg
rem 批处理保存为utf-8编码格式，需要ffmpeg ffprobe
set m=1.5
for /f "delims=" %%i in ('dir /b /a-d *.mp3') do (
	set file=%%i
	setlocal enabledelayedexpansion
	for /f "tokens=1-2 delims==" %%a in ('ffprobe -loglevel 0 -show_streams "!file!"') do (
		if "%%a" equ "sample_rate" (
			set sr=%%b
		) else if "%%a" equ "channel_layout" (
			set cl=%%b
		) else if "%%a" equ "duration" (
			for /f "delims=" %%e in ('powershell -c %%b*%m%') do set dt=%%e
		)
	)
	ffmpeg -f lavfi -t !dt! -i anullsrc=channel_layout=!cl!:sample_rate=!sr! -i "!file!" -filter_complex "[1:a][0:a]concat=n=2:v=0:a=1" outputx.mp3
	move /y outputx.mp3 "!file!"
	endlocal
)
pause
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dir /b /s /a-d *.mp3
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http://bcn.bathome.net/tool/ffmpeg,4.3/ffprobe.exe
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