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gphoto / libgphoto2

The libgphoto2 camera access and control library.
GNU Lesser General Public License v2.1
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First capture takes too long. Further captures are fine. #1018

Closed sygolene closed 1 month ago

sygolene commented 1 month ago

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 commented 1 month ago

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

msmeissn commented 1 month ago

(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 commented 1 month ago

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.