ContractViolation: 
Postcondition violation!
error in png_read_row(): Read Error
(/build/buildd/hugin-2014.0.0+dfsg/src/foreign/vigra/vigra_impex/png.cxx:389)

caught exception: 
Postcondition violation!
error in png_read_row(): Read Error
(/build/buildd/hugin-2014.0.0+dfsg/src/foreign/vigra/vigra_impex/png.cxx:389)

convert: unable to open image `/tmp/frame-135-0000.tif': No such file or directory @ error/blob.c/OpenBlob/2709.
convert: no images defined `frame-135.png' @ error/convert.c/ConvertImageCommand/3210.
rm: cannot remove ‘/tmp/frame-135-0000.tif’: No such file or directory