Drag a recipe file to this Windows batch and you can debug the output of recipe.
This help you to build your recipes.
Code:
@echo off
if not exist "%~dp1%~n1" md "%~dp1%~n1"
if exist "%~dp1%~n1\%~n1.recipe" del /q "%~dp1%~n1\%~n1.recipe"
copy %1 "%~dp1%~n1\%~n1.recipe"
start "Calibre RSS" /wait /b "%ProgramFiles%\Calibre2\ebook-convert.exe" "%~dp1%~n1\%~n1.recipe" "%~dp1%~n1" --test -vv
echo Wait a while even after the message to press enter. The Caliber will start.
pause