This fixes several crashes with the new tstripdata_start/endstill. dupli_seq was cleaned up as well as add_scene_strip (moved to a seperate function) New features: * opacity can be used in replace blend mode * the scene within in a scene track can be changed now within the panel Also: * [#7842] Note: setCodec in FormatTab disappeared... should be fixed by this. (Not a big change, so I just commit and see :) http://peter.schlaile.de/blender/sequencer/codec_buttons.diff