I would not treat 1x/day as a hard ceiling. Especially with clips and memes, the bigger risk is posting two things that are basically aimed at the same viewer in the same mood, not the number itself.
For a film podcast, I would test different jobs for each post: one clip that sells the episode or a take, one meme that is more shareable, maybe one prompt that gets people arguing about a movie. If those formats behave differently, they are less likely to cannibalize each other.
Run it as a two week test instead of trying to guess the rule. Track reach per post, follows per post, profile visits, saves/shares, and whether comments get thinner when you post more. If the second post is consistently weaker, cut back. If both keep pulling their own weight, the account can probably handle more than once a day.