From f0f1719a657ae142ee18e1bbc84e5ebd435a2329 Mon Sep 17 00:00:00 2001
From: dev <dev@local>
Date: Mon, 10 Aug 2026 13:14:48 +0200
Subject: [PATCH] Gemini STT: compressione audio in Opus/OGG (audio/ogg) -60%
 payload vs MP3

---
 extensions/index.ts | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/extensions/index.ts b/extensions/index.ts
index 7d77b59..80eb927 100644
--- a/extensions/index.ts
+++ b/extensions/index.ts
@@ -448,21 +448,22 @@ async function transcribeWithGeminiAPI(file: string): Promise<TranscriptResult>
 
 	const model = process.env.AGY_GEMINI_MODEL ?? "gemini-3.5-flash";
 	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 mimeType = "audio/wav";
 		if (file.toLowerCase().endsWith(".wav")) {
-			const mp3 = file.replace(/\.wav$/i, ".mp3");
+			const ogg = file.replace(/\.wav$/i, ".ogg");
 			try {
 				await execFileAsync(
 					"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 },
 				);
-				audioFile = mp3;
-				mimeType = "audio/mpeg";
+				audioFile = ogg;
+				mimeType = "audio/ogg";
 			} 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");