Ok, it's time for me to jump in and ask a couple of questions.
DeXTeR please look at your xf_thread table and tell me what the size is of the tmdb_director field in that table.
I'm asking because they are normally identical in size and what's happening during conversion is the info from the xf_thread table is being moved into the new XF 2 xf_snog_movies_thread table. And with identical sizes, that error shouldn't happen.
EDIT: I also moved the posts from the TV thread to the Movie thread to keep things somewhat organized.
DeXTeR please look at your xf_thread table and tell me what the size is of the tmdb_director field in that table.
I'm asking because they are normally identical in size and what's happening during conversion is the info from the xf_thread table is being moved into the new XF 2 xf_snog_movies_thread table. And with identical sizes, that error shouldn't happen.
EDIT: I also moved the posts from the TV thread to the Movie thread to keep things somewhat organized.