0001822: Investigate poor playback performance on macOS

ID	Project	Category	View Status	Date Submitted	Last Update

0001822	DCP-o-matic	Bugs	public	2020-09-13 20:43	2023-09-01 21:50

Reporter	carl	Assigned To	carl
Priority	immediate	Severity	major	Reproducibility	have not tried
Status	closed	Resolution	fixed
Target Version	2.16.0

Summary	0001822: Investigate poor playback performance on macOS
Description	Not really sure how.
Tags	No tags attached.

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Estimated weeks required
Estimated work required	Major

carl 2020-10-28 00:04 administrator ~0003978 Last edited: 2020-10-29 19:45	Replacing `dcp::decompress_j2k` in `j2k_image_proxy.cc` with a simple "set it all to red" seems to allow my Catalina mac mini to play back at full frame rate. simple backend: about 130% CPU opengl backend: about 85% CPU Using the timing stuff in the simple backend, the two worst things are: `dc.DrawBitmap()` 17ms per per call `wxBitmap frame_bitmap(frame)` 6ms per call With the opengl backend set_image_and_draw takes 3ms and get_next_frame takes 1ms, so it looks like there's nothing obvious. Using `wxBufferedPaintDC` instead of `wxPaintDC` drops the `dc.DrawBitmap()` right down to 4ms but CPU usage goes up a bit and there are more dropped frames.

carl 2020-10-28 09:31 administrator ~0003980	On mac mini `run/bench` from `libdcp` gets 4.5fps decompression; (i7 gets 9fps).

carl 2020-10-28 15:45 administrator ~0003985 Last edited: 2020-10-29 20:31	profile with "Instruments" `sws_scale` is taking quite some time `free_large()` called by `ASDCP::JP2K::FrameBuffer::~FrameBuffer()` `memmove()` in J2KImageProxy constructor. wxBufferedPaintDC ? http://wxwidgets.10942.n7.nabble.com/Drawing-a-bitmap-is-very-slow-td90810.html bumped wxWidgets to 3.1.4 with required bump to SDK 10.11 - no difference in CPU nor time in simple mode.

carl 2020-10-28 15:46 administrator ~0003986	Scaling `Image` performance - not great, not terrible. scaling.gnumeric (2,485 bytes)

carl 2021-10-02 08:10 administrator ~0004566	I'll resolve this and hope that the new GL backend helps.

Date Modified	Username	Field	Change
2020-09-13 20:43	carl	New Bug
2020-09-16 21:59	carl	Estimated work required	=> Major
2020-10-28 00:04	carl	Note Added: 0003978
2020-10-28 00:04	carl	Assigned To	=> carl
2020-10-28 00:04	carl	Status	new => acknowledged
2020-10-28 09:31	carl	Note Added: 0003980
2020-10-28 15:45	carl	Note Added: 0003985
2020-10-28 15:46	carl	Note Added: 0003986
2020-10-28 15:46	carl	File Added: scaling.gnumeric
2020-10-28 16:56	carl	Note Edited: 0003978
2020-10-28 16:56	carl	Note Edited: 0003978
2020-10-28 16:57	carl	Note Edited: 0003978
2020-10-28 16:59	carl	Note Edited: 0003978
2020-10-28 16:59	carl	Note Edited: 0003978
2020-10-28 18:36	carl	Note Edited: 0003978
2020-10-28 19:37	carl	Note Edited: 0003985
2020-10-29 18:46	carl	Note Edited: 0003985
2020-10-29 18:46	carl	Note Edited: 0003985
2020-10-29 19:06	carl	Note Edited: 0003978
2020-10-29 19:12	carl	Note Edited: 0003978
2020-10-29 19:45	carl	Note Edited: 0003978
2020-10-29 19:46	carl	Note Edited: 0003985
2020-10-29 20:02	carl	Note Edited: 0003985
2020-10-29 20:31	carl	Note Edited: 0003985
2021-10-02 08:10	carl	Status	acknowledged => resolved
2021-10-02 08:10	carl	Resolution	open => fixed
2021-10-02 08:10	carl	Note Added: 0004566
2023-09-01 21:50	carl	Status	resolved => closed

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