I stumbled upon this question when trying to execute a command directly from a PHP script, without using the CLI.
Particularly, I was needing to call orm:ensure-production-settings.
Each Doctrine command has its own class: http://www.doctrine-project.org/api/orm/2.4/namespace-Doctrine.ORM.Tools.Console.Command.html
I solved it the following way:
$entityManager = ...; // Get the entity manager somehow in your application
// Creates the helper set
$helperSet = \Doctrine\ORM\Tools\Console\ConsoleRunner::createHelperSet($entityManager);
// Initializes the desired command and sets the helper set
// In your case it should be ConvertMappingCommand instead
$command = new \Doctrine\ORM\Tools\Console\Command\EnsureProductionSettingsCommand();
$command->setHelperSet($helperSet);
// Initializes the input
// Alternatives: http://api.symfony.com/2.0/Symfony/Component/Console/Input.html
$input = new \Symfony\Component\Console\Input\ArgvInput(); // Input coming from the CLI arguments
// Initializes the output
// Alternatives: http://api.symfony.com/2.0/Symfony/Component/Console/Output.html
$output = new \Symfony\Component\Console\Output\ConsoleOutput(); // Prints the output in the console
// Runs the command
$command->run($input, $output);
I'm new to Doctrine so I'm not exactly sure how this works, but it does. Any comment is appreciated.