ted2mkv as the name suggests, downloads and converts TED videos
available on ted.com to mkv files.

Features:
- Can resume download at any stage.
- Downloads and embeds all available subtitles in the mkv file.
- Downloads and embeds the video summary text and other metadata in the
  mkv file.

Requirements:
- mkvtoolnix (it uses mkvmerge to create the mkv file)

For usage information, run ted2mkv with -h option.