1) Enable a portage overlay dir in your /etc/make.conf (uncomment 'PORTDIR_OVERLAY=/usr/local/portage')

For PCTV Deluxe:
2) mkdir -p /usr/local/portage/media-video/pctv_gtk
3) cp pctv_gtk-1.4.ebuild /usr/local/portage/media-video/pctv_gtk/
4) cd /usr/local/portage/media-video/pctv_gtk/; ebuild pctv_gtk-1.4.ebuild digest (this will download package and build digest files)
5) emerge -avuD pctv_gtk
6) Start the GUI just calling 'pctv_gtk'

For Bungee:
2) mkdir -p /usr/local/portage/media-video/bungee_gtk
3) cp bungee_gtk-1.4.ebuild /usr/local/portage/media-video/bungee_gtk/
4) cd /usr/local/portage/media-video/bungee_gtk/; ebuild bungee_gtk-1.4.ebuild digest (this will download package and build digest files)
5) emerge -avuD bungee_gtk
6) Start the GUI just calling 'bungee_gtk'

Have fun! ^_^