- _done = 0;
- DCPTime const block = DCPTime::from_seconds (1.0 / 8);
- for (DCPTime t; t < _film->length(); t += block) {
- analyse (player->get_audio (t, block, false));
- set_progress (t.seconds() / _film->length().seconds());
+ bool has_any_audio = false;
+ BOOST_FOREACH (shared_ptr<Content> c, _film->content ()) {
+ if (dynamic_pointer_cast<AudioContent> (c)) {
+ has_any_audio = true;
+ }
+ }
+
+ if (has_any_audio) {
+ _done = 0;
+ DCPTime const block = DCPTime::from_seconds (1.0 / 8);
+ for (DCPTime t; t < _film->length(); t += block) {
+ analyse (player->get_audio (t, block, false));
+ set_progress (t.seconds() / _film->length().seconds());
+ }