gbadapp

GBA bad apple. Small demo that plays some of the Bad Apple!! video with full audio.

https://github.com/user-attachments/assets/07064b3f-e07c-4df3-8619-1b0dd25d59e4

Features

• 40 seconds of Bad Apple video at 20fps
• Full synchronized audio playback using maxmod-zig
• Optimized DMA transfers for smooth graphics performance

Prerequisites

• Zig 0.14.1
• uv (for Python dependencies)
• mGBA emulator
• Bad Apple video file (src/bad_apple.mp4)

Building

1. Generate video frame assets:

uv run src/create_simple_frames.py

1. Build the GBA ROM:

zig build

1. Run on mGBA emulator:

mgba zig-out/bin/gbadapp.gba

Asset Configuration

Edit src/create_simple_frames.py to adjust video parameters:

• DURATION: Video length in seconds (default: 40s)
• TARGET_FPS: Video framerate (default: 20fps)
• START_TIME: Start offset in source video (default: 0s)

ROM Size

The current configuration generates approximately 29MB ROM files. The GBA has a 32MB limit. I tried several approaches and 20 FPS for 40s seems to give the best tradeoff in length and quality.

The whole video won't fit. The audio does fit, so video freezes at the end and the audio continues.