- DCPTime from = position ();
- BOOST_FOREACH (shared_ptr<dcp::Reel> i, decoder->reels()) {
- DCPTime const to = from + DCPTime::from_frames (i->main_picture()->duration(), film()->video_frame_rate());
- p.push_back (DCPTimePeriod (from, to));
- from = to;
+ list<DCPTimePeriod> p;
+
+ /* This content's frame rate must be the same as the output DCP rate, so we can
+ convert `directly' from ContentTime to DCPTime.
+ */
+
+ /* The starting point of this content on the timeline */
+ DCPTime pos = position() - DCPTime (trim_start().get());
+
+ BOOST_FOREACH (int64_t i, reel_lengths) {
+ /* This reel runs from `pos' to `to' */
+ DCPTime const to = pos + DCPTime::from_frames (i, film()->video_frame_rate());
+ if (to > position()) {
+ p.push_back (DCPTimePeriod (max(position(), pos), min(end(), to)));
+ if (to > end()) {
+ break;
+ }
+ }
+ pos = to;