If you are looking to create or find a post related to this, here are the likely contexts:

: In recent credits for experimental film or performance reels (such as the project #Experiments: Face the tension ), "mp4" refers to the production role of Boom Operator or Post-Production/VFX .

Based on recent social media activity, Christian van't Hoen is a set photographer and visual effects artist whose work often involves "post-production / VFX".