+ if (KIO::NetAccess::exists(KUrl(m_baseTrackProducers.at(i)->get("resource")), KIO::NetAccess::SourceSide, 0))
+ m_baseTrackProducers[track] = new Mlt::Producer(*m_baseTrackProducers.at(i)->profile(), m_baseTrackProducers.at(i)->get("resource"));
+ else { // special case for placeholder clips
+ m_baseTrackProducers[track] = NULL;
+ return NULL;
+ }