自用ffmpeg脚本合集

指令

视频相关

拼接视频

@echo off

ffmpeg.exe -f concat -i .\filelist.txt -c copy .\output.mp4

echo done
pause

filelist.txt内容类似：

file 'Word2Vec.mp4'
file 'AttentionLayer.mp4'
file 'DecoderOnly.mp4'

缩放视频

缩放到1080P

ffmpeg -i .\input.mp4 -vf scale=1920:1080 -c:a copy output.mp4

裁取区间视频

ffmpeg -i input.mp4 -ss 00:01:00 -to 00:03:30 -c copy output.mp4

将视频转为264编码

ffmpeg -i 'input.mkv' -map 0 -c:a copy -c:s copy -c:v libx264 'input_264.mkv'

音频相关

合并多音轨

@echo off
setlocal enabledelayedexpansion

set "output_folder=output"

if exist "%output_folder%" (
    rmdir /s /q "%output_folder%"
)

mkdir "%output_folder%"

for %%F in (*.mkv) do (
    echo "-------------------------"
    set "input_file=%%~nF"
    set "output_file=!input_file!_merge.mkv"

    ffmpeg -i "%%F" -filter_complex "[0:1][0:2][0:3]amerge=inputs=3[a]" -map 0:v -map "[a]" -c:v copy -c:a aac -b:a 256k "output/!output_file!"
)

echo All files processed successfully.
pause

更多音轨，比如四个：

ffmpeg -i "%%F" -filter_complex "[0:1][0:2][0:3][0:4]amerge=inputs=4[a]" -map 0:v -map "[a]" -c:v copy -c:a aac -b:a 256k "output/!output_file!"

只压制1、3音轨：

ffmpeg -i "%%F" -filter_complex "[0:1][0:3]amerge=inputs=2[a]" -map 0:v -map "[a]" -c:v copy -c:a aac -b:a 256k "output/!output_file!"

抽取视频音轨

ffmpeg -i 'input.mp4' -f mp3 -vn bgm.mp3

生成指定时长的空白音频

@echo off

set /p duration="Please input blank audio time:"
ffmpeg -f lavfi -t %duration% -i anullsrc blank_%duration%s.mp3 -y

echo generate a %duration%s blank audio
pause

拼接音频

@echo off

ffmpeg -f concat -i .\audiolist.txt -acodec copy .\output.mp3

echo done
pause

合并视频和音频

@echo off

ffmpeg -i .\output.mp4 -i .\output.mp3 -map 0:v -map 1:a output_bgm.mp4

echo done
pause