MP4 to MP3 Converter

This tool converts MP4 video URLs into MP3 audio files without requiring the video download. It validates the input URL, selects the best available audio stream, and encodes the audio to MP3 at a configurable bitrate. The process yields a downloadable MP3 URL and metadata such as duration and estimated file size. It is suitable for podcasters who source clips from public videos, educators creating audio summaries, and researchers needing audio transcripts from video content. The system relies on a robust transcoding pipeline and standard audio codecs to ensure compatibility with common players and streaming services. Users benefit from reduced manual steps, simplified workflow, and consistent audio quality across sources. Core capabilities include input validation, stream selection, MP3 encoding, and safe output generation. The tool can enforce a default quality (e.g., 192 kbps) while allowing higher or lower bitrates if needed. It also supports metadata embedding when requested, aiding organization in libraries and content platforms.