如何给本地视频生成字幕

场景

适合如下场景:

  • 视频本身不带字幕
  • 直接看英文视频比较吃力

此时可以使用autosub这个工具来根据视频中的声音来生成对应的字幕，虽然生成的字幕并不总是那么正确，但当做参考还是不错的。

autosub简介

autosub是一款由python 2编写的通过Google Web Speech API和FFmpeg来获取视频subtitle的软件

Github地址: https://github.com/agermanidis/autosub

Github上的Usage:

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$ autosub -h
usage: autosub [-h] [-C CONCURRENCY] [-o OUTPUT] [-F FORMAT] [-S SRC_LANGUAGE]
               [-D DST_LANGUAGE] [-K API_KEY] [--list-formats]
               [--list-languages]
               [source_path]

positional arguments:
  source_path           Path to the video or audio file to subtitle

optional arguments:
  -h, --help            show this help message and exit
  -C CONCURRENCY, --concurrency CONCURRENCY
                        Number of concurrent API requests to make
  -o OUTPUT, --output OUTPUT
                        Output path for subtitles (by default, subtitles are
                        saved in the same directory and name as the source
                        path)
  -F FORMAT, --format FORMAT
                        Destination subtitle format
  -S SRC_LANGUAGE, --src-language SRC_LANGUAGE
                        Language spoken in source file
  -D DST_LANGUAGE, --dst-language DST_LANGUAGE
                        Desired language for the subtitles
  -K API_KEY, --api-key API_KEY
                        The Google Translate API key to be used. (Required for
                        subtitle translation)
  --list-formats        List all available subtitle formats
  --list-languages      List all available source/destination languages

Macos 下安装方法

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brew install ffmpeg
pip install autosub

批量生成

原程序参数貌似不支持多文件，基于自身需要，写了个粗糙的小脚本来批量转换整个目录下的视频文件。目前够用，后续如果有子目录以及除mp4的其他格式的需求，再改进

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USAGE="USAGE: $0 dir|file"

if [ "$1" == "" ]; then
    echo $USAGE
    exit 1
fi

# file process
if [ -f "$1" ]; then
    echo "Start to use autosub to generate subtitle for video $1"
    autosub "$1"
    exit 0
fi

# dir process
if [ ! -d "$1" ]; then
    echo $USAGE
    exit 1
fi

base_dir="$1"
echo "**************************************************"
echo "Start to use autosub to generate subtitle for video in $base_dir"
echo "**************************************************"
echo "cd $base_dir"
echo ""
cd "$base_dir"

find . -iname "*.mp4" | while read file
do
    echo "oooooooooooooooooooooooooo"
    echo " ==== Start to process file - ${file}"
    file_basename=`basename "$file" .mp4`
    subtitle_file_name="${file_basename}.srt"
    # echo "subtitle_file_name is [${subtitle_file_name}]"
    if [ -e "$subtitle_file_name" ]; then
        echo "Subtitle of $file has already existed. don't need to process again"
    else
        autosub "$file"
    fi
    echo " ==== End to process file - ${file}"
    echo "oooooooooooooooooooooooooo"
    echo ""
done

echo ""
echo "**************************************************"
echo "End to use autosub to generate subtitle for video in $base_dir"
echo "**************************************************"

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