3D-printed, button-driven, dedicated video player, based around Raspberry Pi Zero
Electronics Build a button-driven video player using a Raspberry Pi

How-to guide to make a low cost, 3D-printed video player box with selector buttons

Soldered microSD card adapter for use with microcontroller SPI interface
Electronics Connect a microSD card to the ESP8266 or ESP32 using a microSD to SD adapter

Rather than buy a dedicated breakout, it's straightforward to solder up a microSD connector