ffmpeg windows10 批量转格式 .bat批处理文件

echo current dir:%~dp0
rem 批量压缩分辨率
set w=640
set h=480
set ex0="mkv"
set ex1="mp4"
mkdir "%~dp0%w%_%h%"
for %%a in ("%~dp0*.%ex0%") do ffmpeg -threads 2  -hwaccel dxva2 -i "%%a" -vcodec  h264_nvenc  -vf scale=%w%:%h%  -preset fast -maxrate 500k -r 25 -c:a aac "%~dp0%w%_%h%\%%~na.%ex1%"
pause