Import Theora video into Premiere Elements
Currently it doesn't appear possible to directly import Ogg Theora video into Premiere Elements 10, however I did manage to convert the video to DNxHD/VC-3 so that PRE would handle it nicely (previous conversions had behaved very badly)

ffmpeg -i out-48.ogv -s 1920x1080 -r pal -b 36M -threads 2 -vcodec dnxhd -acodec libmp3lame out-48.mov


http://blog.jamiek.it/2012/11/encoding-ogv-files-to-edit-in-adobe.html