[OpenDroneMap-users] Docker Error: float division by zero

[Dennis Baldwin]

Hi,

Today was my first experience running ODM with Docker and I ran into the
following error:

[DEBUG]   running
PYTHONPATH=/code/SuperBuild/install/lib/python2.7/dist-packages
/code/SuperBuild/src/opensfm/bin/run_all /images/opensfm
2016-06-21 22:27:08,640 Extracting focal lengths for image DJI_0160.JPG

Traceback (most recent call last):

  File "/code/SuperBuild/src/opensfm/bin/focal_from_exif", line 27, in
<module>

    d = exif.extract_exif_from_file(data.load_image(image))

  File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 88, in
extract_exif_from_file

    d = exif_data.extract_exif()

  File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 238, in
extract_exif

    focal_35, focal_ratio = self.extract_focal()

  File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 169, in
extract_focal

    get_frac_tag(self.tags, 'EXIF FocalLength'),

  File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 41, in
get_frac_tag

    return eval_frac(tags[key].values[0])

  File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 21, in eval_frac

    return float(value.num) / float(value.den)

ZeroDivisionError: float division by zero

[ERROR]   quitting cause:

PYTHONPATH=/code/SuperBuild/install/lib/python2.7/dist-packages
/code/SuperBuild/src/opensfm/bin/run_all /images/opensfm

returned with code 256.

I was manually forcing the focal and ccd params with the following command:

docker run -v $IMAGES:/images opendronemap:latest --force-focal 3.5
--force-ccd 6.17

Any insight how to get around this? I've run ODM successfully many times on
my VM, but Docker seems to have stopped me.

Thanks,
Dennis
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