Re: Canon 1300D: can only capture one image; second capture fails

Hi Marcus, Hi Volker,
 
> Marcus Meissner <[email protected]> hat am 2. Februar 2017 um 08:34
> geschrieben:
> What I think might be missing here is a bit of waiting between
> the full shutter press and full shutter release.
>
> If you are curious to try something... This basically executes the
> shutter commands the capture function does, plus some additional
> waiting bettween "Press 2" and "Release 2".
>
> export LANG=C
> gphoto2 --wait-event=1s --set-config eosremoterelease="Press 1"
> --wait-event=1s --set-config eosremoterelease="Press 2" --wait-event=100ms
> --set-config eosremoterelease="Release 2" --set-config
> eosremoterelease="Release 1" --wait-event-and-download=5s
 
 
I played a little with the timings. The first wait-event has to be larger then
270ms to make the camera release the shutter.

working:
-----------
gphoto2 --wait-event=270ms --set-config eosremoterelease="Press 1"
--wait-event=80ms --set-config eosremoterelease="Press 2" --wait-event=80ms
--set-config eosremoterelease="Release 2" +--set-config
eosremoterelease="Release 1" --wait-event-and-download=5s

not working:
----------------
gphoto2 --wait-event=250ms --set-config eosremoterelease="Press 1"
--wait-event=80ms --set-config eosremoterelease="Press 2" --wait-event=80ms
--set-config eosremoterelease="Release 2" +--set-config
eosremoterelease="Release 1" --wait-event-and-download=5s

The shutter releases with every call. But after saving the file, gphoto get's an
error -1:
UNKNOWN PTP Property d11b changed
UNKNOWN Camera Status 1
UNKNOWN PTP Property d11b changed
Saving file as capt0000.jpg
UNKNOWN Camera Status 0
*** Error (-1: 'Unspecified error') ***

The jpg file was successfully written to disk and the file contains the correct
image.
The debug trace is here: http://bit.ly/2l0Bima

To test the reliability, I called gphoto in a for loop with 10 iterations. This
didn't work reliable with a wait of 270 like in "single step" when called
without any sleep between the iteration. I had to increase to 500ms to get the
camera release the shutter in every iteration. With a sleep of 1sec after each
iteration, I could decrease the wait to 360ms:

successfully captured 10 images:
for i in `echo 1 2 3 4 5 6 7 8 9 10`; do rm capt0000.jpg; gphoto2
--wait-event=360ms --set-config eosremoterelease="Press 1" --wait-event=80ms
--set-config eosremoterelease="Press 2" --wait-event=80ms --set-config
eosremoterelease="Release 2" +--set-config eosremoterelease="Release 1"
--wait-event-and-download=5s; sleep 1; done

In the for loop, the jpg always contains the first image that was taken in that
sequence. I moved the camera in between so that the image should differ. But it
was always the first image from that loop.

Best regards, Oliver

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