diff --git a/extract.py b/extract.py
index 747fbab..6dfc5ac 100644
--- a/extract.py
+++ b/extract.py
@@ -220,7 +220,7 @@ def _normalize_audio_language(raw: str) -> str:
 def select_audio_stream(path: str, cfg_hint: int | str | None = None) -> int | None:
     """
     Probe audio streams and let user pick one.
-    Returns stream index (int) or None (no audio).
+    Returns 0-based audio stream index for ffmpeg -map 0:a:N, or None (no audio).
     cfg_hint: int = use that index directly, "skip" = None, None = prompt.
     """
     streams = probe_audio_streams(path)
@@ -233,7 +233,7 @@ def select_audio_stream(path: str, cfg_hint: int | str | None = None) -> int | N
         s = streams[0]
         label = _format_stream_label(s)
         print(f"[audio] {os.path.basename(path)}: only 1 stream → {label}")
-        return s["index"]
+        return 0  # -map 0:a:0
 
     # Multiple streams — show menu
     print(f"\n{'=' * 60}")
@@ -242,20 +242,20 @@ def select_audio_stream(path: str, cfg_hint: int | str | None = None) -> int | N
     for i, s in enumerate(streams):
         label = _format_stream_label(s)
         marker = " *" if s.get("is_default") else ""
-        print(f"  [{i}] stream {s['index']}: {label}{marker}")
+        print(f"  [{i}] {label}{marker}")
     print(f"  [s] skip audio extraction")
     print(f"{'=' * 60}")
 
     while True:
         choice = input("Select audio stream [0]: ").strip().lower()
         if choice == "" or choice == "0":
-            return streams[0]["index"]
+            return 0
         if choice == "s":
             return None
         try:
             idx = int(choice)
             if 0 <= idx < len(streams):
-                return streams[idx]["index"]
+                return idx
         except ValueError:
             pass
         print(f"  Invalid choice, enter 0-{len(streams)-1} or 's'")