fix(audio): preserve the parent directory when locating ffprobe

backend/services/ffmpeg_utils.py

@@ -308,7 +308,10 @@ def find_ffprobe():
     try:
         ffmpeg_path = find_ffmpeg()
         if ffmpeg_path:
-            candidate = ffmpeg_path.replace("ffmpeg", "ffprobe")
+            candidate = os.path.join(
+                os.path.dirname(ffmpeg_path),
+                os.path.basename(ffmpeg_path).replace("ffmpeg", "ffprobe"),
+            )
             if os.path.isfile(candidate):
                 return candidate
     except Exception:

tests/backend/services/test_ffmpeg_utils.py

@@ -131,6 +131,21 @@ def test_resolve_ffprobe_env_var_with_command_name_resolves_via_which(
     assert ffmpeg_utils.resolve_ffprobe() == str(fake)
 
 
+@pytest.mark.parametrize("binary_name", ["ffmpeg", "ffmpeg.exe"])
+def test_find_ffprobe_preserves_ffmpeg_parent_directory(monkeypatch, tmp_path, binary_name):
+    from services import ffmpeg_utils
+
+    bindir = tmp_path / "ffmpeg" / "bin"
+    bindir.mkdir(parents=True)
+    ffmpeg = bindir / binary_name
+    ffprobe = bindir / binary_name.replace("ffmpeg", "ffprobe")
+    ffprobe.touch()
+    monkeypatch.setattr(ffmpeg_utils, "resolve_ffprobe", lambda: None)
+    monkeypatch.setattr(ffmpeg_utils, "find_ffmpeg", lambda: str(ffmpeg))
+
+    assert ffmpeg_utils.find_ffprobe() == str(ffprobe)
+
+
 class _ShutilStub:
     """A tiny shim that mimics the parts of shutil ffmpeg_utils touches.