MP3 Converter

This tool converts raw audio inputs into MP3, solving the need for portable, widely supported audio formats. Target users include musicians, podcasters, and developers who receive uncompressed PCM or WAV-like data and require MP3-ready files for distribution, streaming, or archiving. Core problem solved is producing playback-friendly, widely compatible MP3s from non-compressed sources in a predictable, controllable way. The tool supports single-file workflows and can be integrated into pipelines for media production or automation. It emphasizes quality control, encoding transparency, and deterministic outputs for downstream platforms or archives.
Core capability is decoding raw audio, optionally resampling to the target sample_rate and converting to stereo or mono, then encoding to MP3 with a chosen bitrate. Required features: file upload, bitrate_kbps (range 96–320), sample_rate_hz (choices 22050/44100/48000), channels (1/2), and an MP3 output. Optional/advanced: VBR/CBR mode, basic normalization, trimming, and metadata embedding. Batch processing and API access are available as advanced workflows.
Inputs include input_file (file, required), bitrate_kbps (int, 96–320, default 192), sample_rate_hz (int, 22050/44100/48000, default 44100), channels (int, 1/2, default 2). Outputs include mp3_file (file), actual_bitrate_kbps, actual_sample_rate_hz, duration_seconds, file_size_bytes. Validation ensures a decodable input and supported sample rate; errors are raised for DRM-protected or corrupted data.
Encoding follows a standard MP3 workflow: decode input, optionally resample and adjust channels, encode at specified bitrate, duration = input_samples / input_sample_rate, and size ≈ duration * bitrate / 8. Proper handling of short or very long files is implemented to manage memory and time constraints.
Assumes input is unprotected and decodable; excludes DRM-protected data and non-audio streams; does not perform extensive tagging beyond basic support in the optional path; base tool handles one file per run.