2015-12-21 c.hetherington <cth@carlh.net>
+ * Reduce frequency of temporary writes to disk (#748).
+
* Use new Dolby website for both Doremi and Dolby certificates (#775).
2015-12-18 c.hetherington <cth@carlh.net>
void
Writer::set_encoder_threads (int threads)
{
- _maximum_frames_in_memory = lrint (threads * 1.1);
+ /* I think the scaling factor here should be the ratio of the longest frame
+ encode time to the shortest; if the thread count is T, longest time is L
+ and the shortest time S we could encode L/S frames per thread whilst waiting
+ for the L frame to encode so we might have to store LT/S frames.
+
+ However we don't want to use too much memory, so keep it a bit lower than we'd
+ perhaps like. A J2K frame is typically about 1Mb so 3 here will mean we could
+ use about 240Mb with 72 encoding threads.
+ */
+ _maximum_frames_in_memory = lrint (threads * 3);
}
void