Which part of production ends as planning wraps up and production starts?

The phase that concludes with the wrapping up of planning and transitions into the actual shooting of the project is pre-production. This stage involves extensive preparation, where the project is outlined, budgets are determined, casting is completed, locations are selected, and all elements necessary for filming are arranged. Once this planning is finalized, the production team moves into principal photography, which is the stage where the actual filming occurs.

In contrast, post-production refers to the editing and assembly of the film after filming has been completed, while marketing involves promoting the finished product to the audience, both of which come after pre-production and principal photography. Hence, pre-production is correctly identified as the stage that ends when planning wraps up and the actual production phase begins.