shotdetect fatal libpng error gd-png error: setjmp returns error condition

I downloaded shotdetect and followed this guide to install it on OSX Yosemite 10.10.1 .

When I try to run shotdetect, it appears to run through the entire video file, but then fails towards the end. I get a results.xml output, which is what I care most about, but I can't tell if it's complete or not.

This is the error I get:

GD Error: gd-png: fatal libpng error: Wrote palette index exceeding num_palette
GD Warning: gd-png error: setjmp returns error condition

Below is the entire terminal output for a sample video file. Note that 'shotdetect' is simply a bash alias and is not causing the issue. I get the same issue when I call shotdetect directly.

Any help is appreciated.

Thanks,

-Alex

C02MX0SFFD58:cuts user$ shotdetect -i myMovie.mp4 -o output/ -v -a 1
Shot log :: Processing movie.
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'laConfidentialCut.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    title           : UNDEFINED_Title1
    encoder         : Lavf56.4.101
  Duration: 00:10:00.03, start: 0.000000, bitrate: 813 kb/s
    Stream #0:0(und): Video: h264 (High) (avc1 / 0x31637661), yuv420p, 720x404 [SAR 1:1 DAR 180:101], 628 kb/s, 29.97 fps, 29.97 tbr, 30k tbn, 59.94 tbc (default)
    Metadata:
      handler_name    : VideoHandler
    Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, 5.1, fltp, 176 kb/s (default)
    Metadata:
      handler_name    : SoundHandler
Shot log :: 49582
Shot log :: 50417
Shot log :: 50517
Shot log :: 51618
Shot log :: 53353
Shot log :: 54788
Shot log :: 56589
Shot log :: 58458
Shot log :: 60060
Shot log :: 62962
Shot log :: 65865
Shot log :: 68234
Shot log :: 74707
Shot log :: 77377
Shot log :: 79879
Shot log :: 83416
Shot log :: 90623
Shot log :: 90657
Shot log :: 90723
Shot log :: 93460
Shot log :: 98264
Shot log :: 99732
Shot log :: 100934
Shot log :: 102502
Shot log :: 102836
Shot log :: 102902
Shot log :: 103002
Shot log :: 104337
Shot log :: 104437
Shot log :: 104471
Shot log :: 106106
Shot log :: 107574
Shot log :: 108608
Shot log :: 109242
Shot log :: 109309
Shot log :: 110910
Shot log :: 111411
Shot log :: 111811
Shot log :: 111911
Shot log :: 113313
Shot log :: 113480
Shot log :: 113513
Shot log :: 113680
Shot log :: 115281
Shot log :: 116282
Shot log :: 117951
Shot log :: 119619
Shot log :: 122188
Shot log :: 126326
Shot log :: 127494
Shot log :: 128828
Shot log :: 130763
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Shot log :: 133266
Shot log :: 137504
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Shot log :: 140640
Shot log :: 156055
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Shot log :: 559692
GD Error: gd-png: fatal libpng error: Wrote palette index exceeding num_palette
GD Warning: gd-png error: setjmp returns error condition