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SnapOtterandGitHub d4eaa655b2 fix(audio): expose sample rate setting in Convert Audio (#561 )

The Convert Audio tool promised configurable bitrate, sample rate, and channel count, but only format and bitrate were exposed. Adds an optional sampleRate setting (8000 to 96000 Hz, omitted = preserve source) wired through the Zod schema, the FFmpeg -ar flag, the standalone settings panel, and the pipeline builder controls.

Impossible combinations fail loudly instead of degrading silently: MP3 + 96000 Hz is rejected (libmp3lame caps at 48 kHz), and MP3 bitrates above the encoder ceiling at low rates (64 kbps at 8 kHz, 160 kbps at 16/22.05 kHz) are rejected rather than clamped. The UI offers only legal combinations and sanitizes stored pipeline settings on load.

Docs updated in English plus all 20 localized pages with refreshed i18n_source_hash stamps; two new UI strings added to all 21 locales.

Fixes #558

2026-07-18 10:14:50 +08:00

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description

description
Convert audio between MP3, WAV, OGG, FLAC, and M4A formats.

Convert Audio

Convert audio files between common formats including MP3, WAV, OGG, FLAC, and M4A, with configurable output bitrate and sample rate.

API Endpoint

POST /api/v1/tools/audio/convert-audio

Accepts multipart form data with an audio file and a JSON settings field.

Parameters

Parameter	Type	Required	Default	Description
format	string	No	`"mp3"`	Output format: `mp3`, `wav`, `ogg`, `flac`, `m4a`
bitrateKbps	integer	No	`192`	Output bitrate in kbps (32 to 320)
sampleRate	integer	No	source rate	Output sample rate in Hz: `8000`, `16000`, `22050`, `32000`, `44100`, `48000`, or `96000`. Omit to keep the source rate

Example Request

curl -X POST http://localhost:1349/api/v1/tools/audio/convert-audio \
  -H "Authorization: Bearer si_your-api-key" \
  -F "file=@audio.mp3" \
  -F 'settings={"format": "mp3", "bitrateKbps": 192, "sampleRate": 44100}'

Example Response

{
  "jobId": "a1b2c3d4-e5f6-7890-abcd-ef1234567890",
  "downloadUrl": "/api/v1/download/a1b2c3d4-e5f6-7890-abcd-ef1234567890/audio.mp3",
  "originalSize": 4500000,
  "processedSize": 2800000
}

Notes

Supported input formats include MP3, WAV, OGG, FLAC, AAC, M4A, WMA, AIFF, and OPUS.
Bitrate only applies to lossy formats (MP3, OGG, M4A). Lossless formats like WAV and FLAC ignore this setting.
MP3 output supports sample rates up to 48000 Hz. The 96000 Hz option applies to WAV, OGG, FLAC, and M4A only.
MP3 bitrate is capped by the sample rate: at most 64 kbps at 8000 Hz and 160 kbps at 16000 or 22050 Hz. Requests above the cap are rejected instead of being silently lowered.
The output filename keeps the original name with the new extension.

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