gstreamer1: Added

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackware-id.org>
gst1-plugins-base: Added

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackware-id.org>
gst1-plugins-good: Added

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackware-id.org>