From ce9c8341d1c5d3bf93b9a7cb11c15d486f8cb77e Mon Sep 17 00:00:00 2001
From: ProgrammerIn-wonderland
 <30693865+ProgrammerIn-wonderland@users.noreply.github.com>
Date: Sun, 15 Mar 2026 22:01:26 -0700
Subject: [PATCH] Interpret mpga as mp3 for OpenAI transcriptions (#2666)

---
 .../services/ai/stt/OpenAISpeechToTextService.js  | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/src/backend/src/services/ai/stt/OpenAISpeechToTextService.js b/src/backend/src/services/ai/stt/OpenAISpeechToTextService.js
index 6154ef462..8c4343d85 100644
--- a/src/backend/src/services/ai/stt/OpenAISpeechToTextService.js
+++ b/src/backend/src/services/ai/stt/OpenAISpeechToTextService.js
@@ -263,10 +263,11 @@ class OpenAISpeechToTextService extends BaseService {
             throw APIError.create('insufficient_funds');
         }
 
-        const openaiFile = await this.modules.openai.toFile(buffer,
-                        filename,
-                        mimeType ? { type: mimeType } : undefined);
-
+        const openaiFile = await this.modules.openai.toFile(
+            buffer,
+            filename,
+            mimeType ? { type: mimeType } : undefined,
+        );
         const payload = {
             file: openaiFile,
             model: selectedModel,
@@ -352,7 +353,11 @@ class OpenAISpeechToTextService extends BaseService {
         }
 
         if ( ! filename.includes('.') ) {
-            const extension = mimeType ? this.modules.mime.extension(mimeType) : 'mp3';
+            let extension = mimeType ? this.modules.mime.extension(mimeType) : 'mp3';
+            // No one uses mpga but mime resolves audio/mpeg to mpga
+            if ( extension === 'mpga' ) {
+                extension = 'mp3';
+            }
             filename = `${filename}.${extension || 'mp3'}`;
         }