Binary package “libvpx3-dbg” in ubuntu xenial

VP8 and VP9 video codec (debugging symbols)

 VP8 and VP9 are open video codecs, originally developed by On2 and released
 as open source by Google Inc. They are the successor of the VP3 codec,
 on which the Theora codec was based.
 .
 Debugging symbols for the VPX library. This is
 needed to debug programs linked against libvpx3.