深度影音安装之后无法打开，求帮助，打算在终端里运行deep-media-player提示如下
U147:~$ deepin-media-player

Traceback (most recent call last):
  File "/usr/bin/deepin-media-player", line 22, in
    from media_player import MediaPlayer
  File "/usr/share/deepin-media-player/src/media_player.py", line 41, in
    from media_player_menus    import MediaPlayMenus
  File "/usr/share/deepin-media-player/src/media_player_menus.py", line 29, in
    from format_conv.transmageddon import TransmageddonUI
  File "/usr/share/deepin-media-player/src/format_conv/transmageddon.py", line 36, in
    import transcoder_engine
  File "/usr/share/deepin-media-player/src/format_conv/transcoder_engine.py", line 21, in
    import codecfinder
  File "/usr/share/deepin-media-player/src/format_conv/codecfinder.py", line 27, in
    import pygst
ImportError: No module named pygst