0000148: Transitions slow down while playing and then speed up after

ID	Project	Category	View Status	Date Submitted	Last Update

0000148	Cinelerra-GG	[All Projects] Bug	public	2019-02-28 20:58	2019-03-27 23:25

Reporter	PhyllisSmith	Assigned To	PhyllisSmith
Priority	normal	Severity	minor	Reproducibility	sometimes
Status	closed	Resolution	no change required
Product Version
Target Version		Fixed in Version

Summary	0000148: Transitions slow down while playing and then speed up after
Description	Not sure what is happening, but at least the dissolve and bandwipe transitions, on a 30fps video, go from 30fps to 12fps and then when complete up to 140fps before settling back to the expected 30fps. I was able to determine that it seemed to stay about 30fps on April 4,2017 (sav100) but then sometime by Feb 15, 2018 (sav200) it started looking odd. Need investigation.
Tags	No tags attached.

PhyllisSmith 2019-03-01 20:36 manager ~0001058	GG thinks the slowdown (see email) is due to optimization when compiling in debug mode for those who build themselves. We switched here and no longer have the transition slowdown problem. So add -O2 as in: CFLAGS=”-O2 -ggdb” make -j8 rebuild_all

Andrea_Paz 2019-02-28 22:01 manager ~0001043	I've seen that behavior, too. But I have to say that after formatting and reinstalling Arch, the situation has improved a lot. However, when the video playback is lagging behind, it tries to get back to normal (in sync with the audio) by going faster. I'm guessing you have a 144Hz monitor, hence the 140fps. I have a 60Hz display and in fact the max fps to recover synchronization is 60fps. Maybe! I don't understand any of this.

Date Modified	Username	Field	Change
2019-02-28 20:58	PhyllisSmith	New Issue
2019-02-28 22:01	Andrea_Paz	Note Added: 0001043
2019-03-01 20:36	PhyllisSmith	Note Added: 0001058
2019-03-27 23:25	PhyllisSmith	Assigned To	=> PhyllisSmith
2019-03-27 23:25	PhyllisSmith	Status	new => closed
2019-03-27 23:25	PhyllisSmith	Resolution	open => no change required