MIDI to MP3 Converter

Purpose & User Intent: This tool converts MIDI to MP3 online to enable distribution and playback without MIDI hardware. Target users include composers, educators, content creators, and hobbyists who need readily shareable audio from MIDI sources. Core need: produce widely compatible MP3 from symbolic MIDI data.
Core Logic & Features: Users upload a MIDI file and optionally adjust encoding settings. Required features: MIDI file upload; MP3 output generation. Optional/advanced: bitrate (32–320 kbps), sample rate (22.05, 44.1, 48 kHz), and mono/stereo; default normalization. The tool renders MIDI with a default soft-synth and encodes to MP3, returning a downloadable file.
Inputs & Outputs: Inputs: file (MIDI, required); bitrate (kbps, optional); sample_rate (Hz, optional); channels (mono/stereo, optional); output_name (optional). Outputs: MP3 file (format MP3, bitrate as selected); metadata including duration and estimated size; download link.
Algorithms & Calculations: MIDI parsing + synthesis + PCM rendering + MP3 encoding. Output size approx duration_seconds * bitrate_kbps / 8 bytes. Duration equals MIDI playback length. If multiple tracks, channel mixdown to mono or stereo as requested. Default encoder uses standard presets with dithering; quality scales with bitrate.
Error & Edge Cases: Invalid or missing MIDI file; unsupported MIDI events; corrupted files; extremely large files; encoding failures; user-selected settings out of range. Returns clear failure codes in API for retry.
Industry/Region & Localization: Units in kbps and Hz; Common sample rates: 22.05 kHz, 44.1 kHz, 48 kHz. No region-specific formats; data handling follows standard privacy expectations for transient uploads.
Assumptions & Exclusions: Assumes standard MIDI data with on-screen mapping to generic instruments. No raw audio extraction from embedded audio; no WAV export. Not responsible for third-party font or instrument libraries; results vary by synth and encoder; not a streaming service.