It seems the the girtod in the gir-to-d package on Debian Sid has a problem:

|> girtod -i /usr/share/
Display all 406 possibilities? (y or n)

|> girtod -i /usr/share/gir-1.0/GstMpegts-1.0.gir 
Error: APILookup.txt not found, check '--help' for more information.