小PHP脚本来做它:

#!/usr/bin/env php
<?php
declare(strict_types = 1);
if ($argc !== 2) {
    fprintf ( STDERR, "usage: %s dir\n", $argv [0] );
    die ( 1 );
}
$dir = rtrim ( $argv [1], DIRECTORY_SEPARATOR );
if (! is_readable ( $dir )) {
    fprintf ( STDERR, "supplied path is not readable! (try running as an administrator?)" );
    die(1);
}
if (! is_dir ( $dir )) {
    fprintf ( STDERR, "supplied path is not a directory!" );
    die(1);
}
$files = glob ( $dir . DIRECTORY_SEPARATOR . '*.avi' );
foreach ( $files as $file ) {
    system ( "ffmpeg -i " . escapeshellarg ( $file ) . ' ' . escapeshellarg ( $file . '.mp4' ) );
}

小PHP脚本来做它:

#!/usr/bin/env php
<?php
declare(strict_types = 1);
if ($argc !== 2) {
    fprintf ( STDERR, "usage: %s dir\n", $argv [0] );
    die ( 1 );
}
$dir = rtrim ( $argv [1], DIRECTORY_SEPARATOR );
if (! is_readable ( $dir )) {
    fprintf ( STDERR, "supplied path is not readable! (try running as an administrator?)" );
    die(1);
}
if (! is_dir ( $dir )) {
    fprintf ( STDERR, "supplied path is not a directory!" );
    die(1);
}
$files = glob ( $dir . DIRECTORY_SEPARATOR . '*.avi' );
foreach ( $files as $file ) {
    system ( "ffmpeg -i " . escapeshellarg ( $file ) . ' ' . escapeshellarg ( $file . '.mp4' ) );
}

对于Linux和macOS，这可以在一行中完成，使用参数展开来更改输出文件的扩展名:

for i in *.avi; do ffmpeg -i "$i" "${i%.*}.mp4"; done

一行bash脚本很容易完成——替换*。Avi与您的文件类型:

for i in *.avi; do ffmpeg -i "$i" -qscale 0 "$(basename "$i" .avi)".mov  ; done

for i in *.flac;
  do name=`echo "${i%.*}"`;
  echo $name;
  ffmpeg -i "${i}" -ab 320k -map_metadata 0 -id3v2_version 3 "${name}".mp3;
done

使用[1][2]批量处理flac文件到mp3(安全的文件名与空格)

如果你不想转换文件，只是复制编解码器使用下面的代码

for %i in (*.mkv) do ffmpeg -i "%i" -codec copy "%~ni.mp4"

这样可以减少转换时间。