有声视频+BGM(末尾淡出)

@echo off

set out_av=bp.mp4

::out_av为视频路径

::b.wav为

ffmpeg -i %out_av% -vn -acodec pcm_s16le -ar 44100 a.wav -y

::提取原视频声音

ffmpeg -i %out_av% -an -vcodec copy output_video.mp4 -y

::生成静音视频

ffmpeg -i a.wav -i b.wav -filter_complex "[0:a]adelay=0|0,volume=3[a];[1:a]adelay=$(ffprobe -i a.wav -show_entries format=duration -v quiet -of csv="p=0")|$(ffprobe -i b.wav -show_entries format=duration -v quiet -of csv="p=0")[b];[a][b]amix=inputs=2[aout]" -map "[aout]" -acodec pcm_s16le -ar 44100 -ac 2 output.wav -y

::背景音乐和视频声音合并，volume=3设置原声音量比例为3:1

setlocal

for /f "delims=" %%a in ('ffmpeg -i bp.mp4 2^>^&1 ^| findstr "Duration"') do (set "duration=%%a")

echo %duration%

::获取原视频声音时长或视频时长00:00:00.00

set time=%duration:~12,11%

set /a mn=%time:~3,2%

set /a ms=%time:~6,2%

set /a d=%mn%*60+%ms%-2

set in=output_video.mp4

set out=endout1.mp4

ffmpeg -i output.wav -ss 00:00:00 -t %time% -c copy c.wav -y

ffmpeg -i c.wav -filter_complex afade=t=out:st=%d%:d=2 end.wav -y

ffmpeg -i %in% -i end.wav -c:v copy -c:a aac -strict experimental %out% -y

del c.wav

del a.wav

del end.wav

del output.wav

del output_video.mp4

echo d%duration%f%format%,%time%,%d%

pause

无声视频+bgm（末尾淡出）

@echo off

set mv=b.mp4

set bgm=bgm.wav

::out_av为视频路径

::bgm为背景音乐

for /f "delims=" %%a in ('ffmpeg -i %mv% 2^>^&1 ^| findstr "Duration"') do (set "duration=%%a")

echo %duration%

::获取原视频声音时长或视频时长00:00:00.00

set time=%duration:~12,11%

set /a mn=%time:~3,2%

set /a ms=%time:~6,2%

set /a d=%mn%*60+%ms%-2

set out=endout1.mp4

ffmpeg -i %bgm% -ss 00:00:00 -t %time% -c copy c.wav -y

ffmpeg -i c.wav -filter_complex afade=t=out:st=%d%:d=2 end.wav -y

ffmpeg -i %mv% -i end.wav -c:v copy -c:a aac -strict experimental %out% -y

del c.wav

del end.wav

echo %duration%,%time%,%d%

pause

for 循环语法

@echo off

set "dirPath=D:\PYcharm\ANIMS\myself_anim\movie\end\use\123"   ::文件夹路径

for /r "%dirPath%" %%i in (*.mp4) do (

  echo %%i

)

pause