+ DCPOMATIC_ASSERT (j->video_frame_rate ());
+ double const cfr = j->video_frame_rate().get();
+ Frame const trim_start = j->trim_start().frames_round (cfr);
+ Frame const trim_end = j->trim_end().frames_round (cfr);
+ int const ffr = _film->video_frame_rate ();
+
+ /* position in the asset from the start */
+ int64_t offset_from_start = 0;
+ /* position in the asset from the end */
+ int64_t offset_from_end = 0;
+ BOOST_FOREACH (shared_ptr<dcp::Reel> k, decoder->reels()) {
+ /* Assume that main picture duration is the length of the reel */
+ offset_from_end += k->main_picture()->actual_duration();
+ }
+