+ double start = DBL_MAX, end = DBL_MIN;
+ Track *first_track=0, *last_track = 0;
+ for( Track *track=edl->tracks->first; track; track=track->next ) {
+ if( !track->record ) continue;
+ int empty = 1;
+ for( Edit *edit=track->edits->first; edit; edit=edit->next ) {
+ if( !edit->is_selected || edit->silence() ) continue;
+ double edit_pos = track->from_units(edit->startproject);
+ if( start > edit_pos ) start = edit_pos;
+ if( end < (edit_pos+=edit->length) ) end = edit_pos;
+ empty = 0;
+ }
+ if( empty ) continue;
+ if( !first_track ) first_track = track;
+ last_track = track;
+ }
+ if( !first_track ) return;