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<p><span style="font-size: 12pt;">It looks to me like this line in OpenSfM doesn't check for division by 0: </span><a href="https://github.com/mapillary/OpenSfM/blob/odm-2/opensfm/exif.py#L21" class="OWAAutoLink" id="LPlnk412118" style="font-size: 12pt;">https://github.com/mapillary/OpenSfM/blob/odm-2/opensfm/exif.py#L21</a><br>
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<p>But I bet it has to do with the --force-focal tag not properly being passed over to OpenSfM either.</p>
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<p>Why don't you document your problem and post it as an issue?</p>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> OpenDroneMap-users <opendronemap-users-bounces@lists.osgeo.org> on behalf of Dennis Baldwin <db@unmannedairlines.com><br>
<b>Sent:</b> Tuesday, June 21, 2016 6:34:14 PM<br>
<b>To:</b> opendronemap-users@lists.osgeo.org<br>
<b>Subject:</b> [OpenDroneMap-users] Docker Error: float division by zero</font>
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<div dir="ltr">Hi,
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<div>Today was my first experience running ODM with Docker and I ran into the following error:</div>
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<p class=""><span class="">[DEBUG] running PYTHONPATH=/code/SuperBuild/install/lib/python2.7/dist-packages /code/SuperBuild/src/opensfm/bin/run_all /images/opensfm<br>
</span>2016-06-21 22:27:08,640 Extracting focal lengths for image DJI_0160.JPG</p>
<p class=""><span class="">Traceback (most recent call last):</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/bin/focal_from_exif", line 27, in <module></span></p>
<p class=""><span class=""> d = exif.extract_exif_from_file(data.load_image(image))</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 88, in extract_exif_from_file</span></p>
<p class=""><span class=""> d = exif_data.extract_exif()</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 238, in extract_exif</span></p>
<p class=""><span class=""> focal_35, focal_ratio = self.extract_focal()</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 169, in extract_focal</span></p>
<p class=""><span class=""> get_frac_tag(self.tags, 'EXIF FocalLength'),</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 41, in get_frac_tag</span></p>
<p class=""><span class=""> return eval_frac(tags[key].values[0])</span></p>
<p class=""><span class=""> File "/code/SuperBuild/src/opensfm/opensfm/exif.py", line 21, in eval_frac</span></p>
<p class=""><span class=""> return float(value.num) / float(value.den)</span></p>
<p class=""><span class="">ZeroDivisionError: float division by zero</span></p>
<p class=""><span class="">[ERROR] quitting cause: </span></p>
<p class=""><span class=""><span class=""></span>PYTHONPATH=/code/SuperBuild/install/lib/python2.7/dist-packages /code/SuperBuild/src/opensfm/bin/run_all /images/opensfm</span></p>
<p class=""><span class="">returned with code 256.</span></p>
<p class="">I was manually forcing the focal and ccd params with the following command:</p>
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<p class=""><span class="">docker run -v $IMAGES:/images opendronemap:latest --force-focal 3.5 --force-ccd 6.17</span></p>
<p class="">Any insight how to get around this? I've run ODM successfully many times on my VM, but Docker seems to have stopped me.</p>
<p class="">Thanks,<br>
Dennis</p>
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