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Gemini STT: compressione audio in Opus/OGG (audio/ogg) -60% payload vs MP3

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dev
2026-08-10 13:14:48 +02:00
parent 2dca098481
commit f0f1719a65
1 changed files with 7 additions and 6 deletions
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extensions/index.ts
+7 -6
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@@ -448,21 +448,22 @@ async function transcribeWithGeminiAPI(file: string): Promise<TranscriptResult>
const model = process.env.AGY_GEMINI_MODEL ?? "gemini-3.5-flash"; const model = process.env.AGY_GEMINI_MODEL ?? "gemini-3.5-flash";
try { try {
// Comprimi in MP3 per evitare HTTP 413 su registrazioni lunghe // Comprimi in Opus/OGG (audio/ogg) — molto più efficiente dell'MP3 per il parlato,
// riduce il payload di ~60% evitando HTTP 413 su registrazioni lunghe
let audioFile = file; let audioFile = file;
let mimeType = "audio/wav"; let mimeType = "audio/wav";
if (file.toLowerCase().endsWith(".wav")) { if (file.toLowerCase().endsWith(".wav")) {
const mp3 = file.replace(/\.wav$/i, ".mp3"); const ogg = file.replace(/\.wav$/i, ".ogg");
try { try {
await execFileAsync( await execFileAsync(
"ffmpeg", "ffmpeg",
["-y", "-i", file, "-ac", "1", "-ar", "16000", "-c:a", "libmp3lame", "-q:a", "5", mp3], ["-y", "-i", file, "-ac", "1", "-ar", "16000", "-c:a", "libopus", "-b:a", "16k", ogg],
{ timeout: 60_000 }, { timeout: 60_000 },
); );
audioFile = mp3; audioFile = ogg;
mimeType = "audio/mpeg"; mimeType = "audio/ogg";
} catch (e: any) { } catch (e: any) {
return { text: "", error: `Conversione MP3 fallita: ${e.message}` }; return { text: "", error: `Conversione Opus fallita: ${e.message}` };
} }
} }
const b64 = fs.readFileSync(audioFile).toString("base64"); const b64 = fs.readFileSync(audioFile).toString("base64");