小编Bia*_*apy的帖子

我正在编写一个命令行工具,将具有各种格式的输入音乐库(flac/ogg/mp3/...)转换为给定格式的输出音乐库(flac/ogg/mp3).我将它基于avconv(或ffmpeg,如果avconv不可用),因为它是我发现的最完整的命令行转换器.我的脚本可从此URL(GitHub)获得:

https://github.com/biapy/howto.biapy.com/blob/master/various/mussync-tools

我正在尝试将元数据从输入库文件传递到输出/转换的库文件.

我想出了这段代码:

 local MAP_METADATA=' 0:g'
  # Specific needs for some input formats/
  case "${INPUT_FILE_MIMETYPE}" in
    'application/ogg' )
      # Get input metadata from first audio stream and direct it to global.
      MAP_METADATA=' 0:s:0'
      ;;

    * )
      # Do nothing.
      # MAP_METADATA=' 0:g'
      ;;
  esac

  # Specific needs for some output formats/
  local OUTPUT_OPTIONS=""
  case "${OUTPUT_FORMAT}" in
    'flac' )
      # No encoding options needed.
      ENCODING_OPTIONS=""
      ;;

    'ogg' )
      # Set vorbis as default codec for ogg.
      OUTPUT_OPTIONS="-codec:a libvorbis -f ${OUTPUT_FORMAT}" …