brltty-ttb: unspecified input format.

Usage: brltty-ttb [option ...] input-table [output-table] -e --edit Edit table. -i format --input-format= Format of input file. -o format --output-format= Format of output file. -c charset --charset= 8-bit character set to use. -u --undefined Report the characters within the current screen font that aren't defined within the text table. -h --help Print a usage summary (commonly used options only), and then exit. -H --full-help Print a usage summary (all options), and then exit.