Failing on Mac OS X 10.11 about waifu2x

[nagadomi]

Does ./images/miku_small.png exist?
It seems that input file does not exist.
Try

th waifu2x -i path/to/input_image.jpg -o output.png

And I will fix error handling for it.

[GRMrGecko]

The file does exist.

waifu2x grmrgecko$ ls ./images/miku_small.png
./images/miku_small.png
waifu2x grmrgecko$ th waifu2x.lua -i ./images/miku_small.png -o output.png
/Users/grmrgecko/torch/install/bin/luajit: .../torch/install/share/lua/5.1/nn/SpatialConvolutionMM.lua:73: attempt to index field 'nn' (a nil value)
stack traceback:
    .../torch/install/share/lua/5.1/nn/SpatialConvolutionMM.lua:73: in function 'updateOutput'
    .../grmrgecko/torch/install/share/lua/5.1/nn/Sequential.lua:44: in function 'forward'
    lib/reconstruct.lua:41: in function 'reconstruct_rgb'
    lib/reconstruct.lua:153: in function 'image_f'
    waifu2x.lua:56: in function 'convert_image'
    waifu2x.lua:198: in function 'waifu2x'
    waifu2x.lua:203: in main chunk
    [C]: in function 'dofile'
    ...ecko/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
    [C]: at 0x010b910bc0
waifu2x grmrgecko$ th waifu2x.lua -i /Users/grmrgecko/waifu2x/images/miku_small.png -o output.png
/Users/grmrgecko/torch/install/bin/luajit: .../torch/install/share/lua/5.1/nn/SpatialConvolutionMM.lua:73: attempt to index field 'nn' (a nil value)
stack traceback:
    .../torch/install/share/lua/5.1/nn/SpatialConvolutionMM.lua:73: in function 'updateOutput'
    .../grmrgecko/torch/install/share/lua/5.1/nn/Sequential.lua:44: in function 'forward'
    lib/reconstruct.lua:41: in function 'reconstruct_rgb'
    lib/reconstruct.lua:153: in function 'image_f'
    waifu2x.lua:56: in function 'convert_image'
    waifu2x.lua:198: in function 'waifu2x'
    waifu2x.lua:203: in main chunk
    [C]: in function 'dofile'
    ...ecko/torch/install/lib/luarocks/rocks/trepl/scm-1/bin/th:145: in main chunk
    [C]: at 0x0105716bc0
waifu2x grmrgecko$ ls /Users/grmrgecko/waifu2x/images/miku_small.png
/Users/grmrgecko/waifu2x/images/miku_small.png

[nagadomi]

I think this issue is caused by PNG loading error.
Did you install libpng?

[GRMrGecko]

Yes. libpng is installed. Now, csnappy and lua-csnappy is not as they both fail to compile on OS X.

[nagadomi]

snappy is required in training script only.