First capture takes too long. Further captures are fine.

[sygolene]

Describe the bug
Hello, I'd like to submit the following issue, I didn't find a recent ressembling issue after a search.

The first capture always takes much longer than subsequent ones.
first capture : ~10s (20+ in debug)
next : < 0.2s
Tested using the python binding python-gphoto2 & command line gphoto2.

The camera is set to manual mode and manual focus so there aren't scene related influence on the capture. When untethered, the camera captures fine with no delays on first capture.

gphoto2 --debug --debug-loglevel=debug --debug-logfile=logfile.txt --capture-image -I 1 -F 5
Time-lapse mode enabled (interval: 1s).
Capturing frame #1/5...
New file is in location /store_00010001/DCIM/101OLYMP/P1011065.JPG on the camera
not sleeping (23 seconds behind schedule)
Capturing frame #2/5...
New file is in location /store_00010001/DCIM/101OLYMP/P1011066.JPG on the camera
not sleeping (0 seconds behind schedule)

Jim Easterbrook & I narrowed it down to a likely libgphoto2 issue.

Name the camera

Camera name as shown by gphoto2 --auto-detect or USB ID
camera ID has always been weird here : detecting E-M1 but in use, properly recognizes the actual camera (E-M5 mkII) and the capture

From shell
gphoto2 --auto-detect
Model Port
Olympus E-M1 usb:003,003

From debug files, proper detection
Device info:
Manufacturer: OLYMPUS
Model: E-M5MarkII
device version: 1.00
serial number: 'BHEA54750'

libgphoto2 and gphoto2 version
libgphoto2 2.5.31
gphoto2 2.5.28

To Reproduce
Steps to reproduce the behavior:
capture a single frame using gphoto2 : gphoto2 --capture-image
or
an interval shoot : gphoto2 --capture-image -I 1 -F 5
See attached debug file.
logfile-debug.txt
Looking at the timecodes, we see subsequent frames speeding fine.

Thanks in advance for your consideration and help !

[sygolene]

the capture time was actually growing progressively. I formatted the SD card used by the camera and it solved the problem.

[msmeissn]

(yes, background is to give the correct filename, we need to read the filesystem info of the whole card. After first capture the filesystem is cached, so only the first capture is slow.)

[sygolene]

I see, the file system was ever growing, making the traverse longer. Interesting. Thanks msmeissn !
Wouldn't there be an option to concede the naming to the camera, as I'm saving on the SD card.