gphoto 2.5.4/2.5.10/2.5.11 works unreliable on RP3 with Canon 1200D

Hi gphoto User list!

I am stuck utilizing a raspberry Pi 3 to steer a Canon 1200D via
gphoto2. Using a home brew python script that takes a capture in intervals.

Raspbian comes with gphoto 2.5.4. This version detects the camera an can
perform any action on it except making captures in a stable fashion.

Have updated to 2.5.10 from Jessie-Backport. Same behavior.

Have compiled myself 2.5.11 Raspbian package from the git-Repository.
Same behavior.

Have had a clean start with fresh OS-Image. Some behavior.

The behavior is not deterministic. Sometime it captures sometimes not.

Resetting the camera via ghpoto2 --reset does not help.

Resetting the linux USB-Bus does not help.

Resetting the camera cures the problem, but only for a few shots.

No other process is using the Canon-usb-device. gvfs-gphoto is disabled,
no kernel module is using it.

Here the picture from 10000ft: First shot does not work. Second shot
works, third shot does not work:

pi@raspberrypi:~ $ ./run_meteocam

2017-01-15 01:42:37,338 INFO     Meteocam starting
2017-01-15 01:42:37,339 INFO     Starting processing step
2017-01-15 01:42:37,340 INFO     Resetting Camera
2017-01-15 01:42:37,340 INFO     Running: /usr/bin/gphoto2 --reset
2017-01-15 01:42:37,648 INFO     Got
2017-01-15 01:42:37,650 INFO        
2017-01-15 01:42:37,651 INFO     Camera resetted
2017-01-15 01:42:37,652 INFO     Starting image capture
2017-01-15 01:42:37,652 INFO     Running: /usr/bin/gphoto2
--capture-image-and-download --force-overwrite
--filename=capture/Schedule_20170115-014237.jpg --set-config aperture=8
--set-config iso=0
FEHLER: Konnte Bild nicht aufnehmen.
FEHLER: Konnte nicht aufnehmen.
2017-01-15 01:43:41,303 INFO     Got
2017-01-15 01:43:41,305 INFO        
2017-01-15 01:43:41,307 INFO     Image captured
2017-01-15 01:43:41,308 INFO     Starting FTP upload
2017-01-15 01:43:41,309 INFO     Looking for images to load up:
beo-webcam.ch
2017-01-15 01:43:41,311 INFO     0 files found
2017-01-15 01:43:41,312 INFO     FTP: Nothing to upload
2017-01-15 01:43:41,313 INFO     Processing step finished
2017-01-15 01:43:41,314 INFO     Sleeping 60 seconds
2017-01-15 01:44:41,376 INFO     Starting processing step
2017-01-15 01:44:41,377 INFO     Resetting Camera
2017-01-15 01:44:41,378 INFO     Running: /usr/bin/gphoto2 --reset
2017-01-15 01:44:41,718 INFO     Got
2017-01-15 01:44:41,719 INFO        
2017-01-15 01:44:41,720 INFO     Camera resetted
2017-01-15 01:44:41,721 INFO     Starting image capture
2017-01-15 01:44:41,721 INFO     Running: /usr/bin/gphoto2
--capture-image-and-download --force-overwrite
--filename=capture/Schedule_20170115-014441.jpg --set-config aperture=8
--set-config iso=0
2017-01-15 01:44:48,871 INFO     Got
2017-01-15 01:44:49,552 INFO         Neue Datei ist in /capt0000.jpg auf
der Kamera
2017-01-15 01:44:49,553 INFO         Speichere Datei als
capture/Schedule_20170115-014441.jpg
2017-01-15 01:44:49,554 INFO         Lösche Datei /capt0000.jpg auf der
Kamera
2017-01-15 01:44:49,556 INFO        
2017-01-15 01:44:49,557 INFO     Image captured
2017-01-15 01:44:49,558 INFO     Starting FTP upload
2017-01-15 01:44:49,559 INFO     Looking for images to load up:
beo-webcam.ch
2017-01-15 01:44:49,560 INFO     1 files found
2017-01-15 01:44:49,561 INFO     Opening FTP Connection to: beo-webcam.ch
2017-01-15 01:44:52,368 INFO     Loading up:
capture/Schedule_20170115-014441.jpg
2017-01-15 01:44:53,667 INFO     upload finished for:
capture/Schedule_20170115-014441.jpg
2017-01-15 01:44:53,669 INFO     Removing local file:
capture/Schedule_20170115-014441.jpg
2017-01-15 01:44:53,677 INFO     local file removed:
capture/Schedule_20170115-014441.jpg
2017-01-15 01:44:53,680 INFO     FTP Upload finished
2017-01-15 01:44:53,681 INFO     Processing step finished
2017-01-15 01:44:53,682 INFO     Sleeping 60 seconds
2017-01-15 01:45:53,743 INFO     Starting processing step
2017-01-15 01:45:53,744 INFO     Resetting Camera
2017-01-15 01:45:53,745 INFO     Running: /usr/bin/gphoto2 --reset
2017-01-15 01:45:54,108 INFO     Got
2017-01-15 01:45:54,110 INFO        
2017-01-15 01:45:54,110 INFO     Camera resetted
2017-01-15 01:45:54,111 INFO     Starting image capture
2017-01-15 01:45:54,111 INFO     Running: /usr/bin/gphoto2
--capture-image-and-download --force-overwrite
--filename=capture/Schedule_20170115-014554.jpg --set-config aperture=8
--set-config iso=0
FEHLER: Konnte Bild nicht aufnehmen.
FEHLER: Konnte nicht aufnehmen.
2017-01-15 01:46:57,765 INFO     Got
2017-01-15 01:46:57,767 INFO        
2017-01-15 01:46:57,768 INFO     Image captured
2017-01-15 01:46:57,769 INFO     Starting FTP upload
2017-01-15 01:46:57,770 INFO     Looking for images to load up:
beo-webcam.ch
2017-01-15 01:46:57,771 INFO     0 files found
2017-01-15 01:46:57,772 INFO     FTP: Nothing to upload
2017-01-15 01:46:57,773 INFO     Processing step finished
2017-01-15 01:46:57,774 INFO     Sleeping 60 seconds

And the weird stuff at last:

If I enable --debug everything is working. A true Heisenbug? Timing problem?

What am I doing wrong? What can I do better?

Any help appreciated

Volker


-- 
=========================================================
   inqbus Scientific Computing    Dr.  Volker Jaenisch
   Richard-Strauss-Straße 1       +49(08861) 690 474 0
   86956 Schongau-West            http://www.inqbus.de
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