diff --git a/.memory/worklog.json b/.memory/worklog.json
index b860abc..504e9f5 100644
--- a/.memory/worklog.json
+++ b/.memory/worklog.json
@@ -1,18 +1,5 @@
 {
   "entries": [
-    {
-      "files_changed": 1,
-      "message": "Codex 会话活跃 · 最近命令：codex · 1 项未提交变更 · 最近提交：auto-save 2026-05-14 17:43 (~1)",
-      "ts": "2026-05-14T09:48:43Z",
-      "type": "session-heartbeat"
-    },
-    {
-      "files_changed": 1,
-      "hash": "807f89b",
-      "message": "auto-save 2026-05-14 17:48 (~1)",
-      "ts": "2026-05-14T17:48:47+08:00",
-      "type": "commit"
-    },
     {
       "files_changed": 1,
       "hash": "32eca89",
@@ -3269,6 +3256,19 @@
       "message": "auto-save 2026-05-17 12:50 (~8)",
       "hash": "4dc4092",
       "files_changed": 8
+    },
+    {
+      "ts": "2026-05-17T12:55:45+08:00",
+      "type": "commit",
+      "message": "refactor: narrow intake to audio-first workflow",
+      "hash": "3b9e74f",
+      "files_changed": 9
+    },
+    {
+      "ts": "2026-05-17T04:58:24Z",
+      "type": "session-heartbeat",
+      "message": "Codex 会话活跃 · 最近命令：codex · 分支 main · 1 项未提交变更 · 最近提交：refactor: narrow intake to audio-first workflow",
+      "files_changed": 1
     }
   ]
 }
diff --git a/api/main.py b/api/main.py
index b960f1d..ef9e9a2 100644
--- a/api/main.py
+++ b/api/main.py
@@ -7,6 +7,7 @@ import hmac
 import json
 import os
 import random
+import re
 import secrets
 import shutil
 import subprocess
@@ -133,6 +134,14 @@ VIDEO_STATUS_PATH = os.getenv("VIDEO_STATUS_PATH", DEFAULT_VIDEO_STATUS_PATH).st
 VIDEO_CONTENT_PATH = os.getenv("VIDEO_CONTENT_PATH", DEFAULT_VIDEO_CONTENT_PATH).strip() or DEFAULT_VIDEO_CONTENT_PATH
 VIDEO_DURATION_FIELD = os.getenv("VIDEO_DURATION_FIELD", "seconds").strip() or "seconds"
 VIDEO_POLL_TIMEOUT_SECONDS = max(60, int(os.getenv("VIDEO_POLL_TIMEOUT_SECONDS", "900")))
+FFMPEG_BIN = os.getenv("FFMPEG_BIN", "").strip()
+FFPROBE_BIN = os.getenv("FFPROBE_BIN", "").strip()
+LOCAL_FFMPEG_CANDIDATES = [
+    "/Applications/Downie 4.app/Contents/Resources/ffmpeg",
+    "/Applications/Permute 3.app/Contents/Resources/ffmpeg",
+    "/Applications/VideoFusion-macOS.app/Contents/Resources/ffmpeg",
+]
+_MEDIA_BIN_CACHE: dict[str, str] = {}
 
 # OpenAI 客户端（OpenAI 兼容网关，含 SKG ezlink）
 from openai import OpenAI