fritsch/xbmc — comment on commit 3f9fe470d29d8387ba305246a8a9f36dfe8b864b
File: xbmc/cores/dvdplayer/DVDCodecs/Video/XVBA.cpp line 269
By fritsch:

Will keep m_clip there to initialize it, but will also copy it to CreateSession - to give the tvheadend people a chance when they zap the channel from interlaced to progressive.