if (afs->sample_rate() != _session->nominal_frame_rate()) {
boost::shared_ptr<SrcFileSource> sfs (new SrcFileSource(*_session, afs, _src_quality));
srclist.push_back(sfs);
if (afs->sample_rate() != _session->nominal_frame_rate()) {
boost::shared_ptr<SrcFileSource> sfs (new SrcFileSource(*_session, afs, _src_quality));
srclist.push_back(sfs);