Converter to AAC

About This Tool

This tool provides AAC audio conversion from common source formats for developers, podcasters, content teams, and media engineers who publish audio for web, apps, and streaming. It accepts WAV, MP3, FLAC, OGG, and M4A inputs and outputs AAC-LC files (.m4a or .aac) that are broadly compatible with major platforms, including web players and mobile apps. Core Logic & Features: The workflow decodes the input, resamples to the selected sample rate, adjusts channel layout (mono or stereo), optionally normalizes loudness, and encodes to AAC at a chosen bitrate or via a VBR profile. Required inputs include input_file, output_format (AAC), and target bitrate; optional advanced inputs include sample_rate_hz, channels, two_pass, and metadata. Outputs include output_file, duration_seconds, final_bitrate_kbps, and file_size_bytes. Inputs & Outputs: Inputs cover input_file (path or binary data), bitrate_kbps (number, 16–320), sample_rate_hz (number, e.g., 44100 or 48000), channels (1 or 2, default 2), normalize (boolean, default false), and metadata (object with title/artist/album/year). Outputs include output_file (path), duration_seconds (seconds), final_bitrate_kbps (kbps), file_size_bytes, and container (string). Algorithms & Calculations: The process follows a decode-resample-encode pipeline: decode input, resample to target rate, convert channel layout, apply optional loudness normalization, and encode to AAC-LC. If VBR is enabled, the encoder targets an average bitrate. Output size is estimated as duration_seconds × bitrate_kbps × 1000 ÷ 8, with adjustments for container overhead. Error & Edge Cases: Invalid input formats, missing input_file, DRM-protected sources, unsupported sample rates, or conflicting metadata trigger structured errors. Validation checks ensure bitrates within supported ranges, and impossible combinations are rejected with precise error codes. Industry/Region & Localization: Units follow ITU-R and MPEG standards; AAC-LC is widely supported for web, mobile, and broadcast; no region-specific licenses beyond standard AAC usage. Assumptions & Exclusions: The tool does not remove DRM or bypass copy protection; it does not manage licensing for protected content, and it does not perform streaming transcoding beyond file-based conversion.

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