Video Lyrics Converter

Purpose & User Intent: This tool ingests video or audio tracks containing vocal content and outputs timed lyrics suitable for captions, lyric databases, or music analytics. Target users include video editors, content creators, music producers, linguists, and archivists who need rapid, machine-assisted lyric extraction without manual transcription. Use cases include captioning workflows, keyword-based lyric search, licensing metadata, and lyric-based auditing of large media libraries.

Core Logic & Features: The tool performs automated speech recognition, language detection, and lyric alignment against video timestamps. Required features include reliable ingestion of common video formats, language handling, time-coded lyric generation, and exports in SRT, LRC, or TXT. Optional/advanced features include noise reduction, speaker diarization, lyric-only extraction, confidence scoring, and adjustable timecode granularity for line-level alignment.

Inputs & Outputs: Inputs comprise video files (MP4, MOV, WEBM) or audio tracks (WAV, MP3) with optional language hints. Outputs include a structured lyric stream with per-line timestamps, full transcripts, and exports in SRT, LRC, or plain text, together with per-line confidence scores when available.

Algorithms & Calculations: Core methods merge ASR models with alignment procedures that map recognized tokens to lyric strings while preserving approximate rhythm cues. The system uses language codes (e.g., en-US), phoneme-to-lexeme mapping, and post-processing to correct punctuation and common misrecognitions. Timecodes are derived from token timestamps and video seek positions.

Error & Edge Cases: Handles missing files or unsupported formats gracefully, detects low-volume or high-noise segments, and flags potential overlaps between speakers. If confidence falls below a threshold, outputs are annotated and flagged for manual review; corrupted segments are skipped or substituted with placeholders.

Industry/Region & Localization: Exports follow standards for captions (SRT, VTT) and lyric tagging (LRC) with language tags in IETF BCP-47 format. Localization considerations include regional spellings, date/time formatting, and script direction where applicable.

Assumptions & Exclusions: Assumes audio is speech-dominant with limited overlapping dialogue. Not designed for music-only tracks or fully instrumental content. This specification excludes editing features, UI behavior, branding, and any post-production effects beyond basic transcription and time alignment.