fix(node): prefer the bundled ffmpeg over PATH in the frozen build

shutil.which never looks beside meshbay-node.exe, and node-runtime is
appended to the user PATH, so any earlier ffmpeg.exe on PATH ran instead
of the pinned copy. Log the resolved media tools at startup.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 23 insertions, 2 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/platform.py b/packages/meshbay-node/src/meshbay_node/platform.py
index 2255036..88db83d 100644
--- a/packages/meshbay-node/src/meshbay_node/platform.py
+++ b/packages/meshbay-node/src/meshbay_node/platform.py
@@ -171,25 +171,46 @@ _ffmpeg_path: str = "ffmpeg"
 _ffprobe_path: str = "ffprobe"
 
 
+def _resolve_media_tool(name: str) -> str | None:
+    """
+    The copy shipped next to a frozen meshbay-node.exe first, then PATH.
+
+    ``shutil.which`` alone never looks in the executable's own directory: it
+    tries the current directory, then PATH, where the installer appends
+    node-runtime to the *user* PATH, which Windows places after the system one.
+    So any ffmpeg.exe earlier on PATH, from whatever application put it there,
+    ran instead of the pinned, checksummed copy we ship.
+    A name with a directory in it is the user's explicit choice and is left alone.
+    """
+    if getattr(sys, "frozen", False) and os.path.basename(name) == name:
+        exe = name if name.lower().endswith(".exe") or sys.platform != "win32" \
+            else f"{name}.exe"
+        bundled = Path(sys.executable).parent / exe
+        if bundled.is_file():
+            return str(bundled)
+    return shutil.which(name)
+
+
 def check_media_tools(
     ffmpeg: str = "ffmpeg", ffprobe: str = "ffprobe",
 ) -> None:
     """Resolve ffmpeg/ffprobe at daemon startup. Raises RuntimeError if not found."""
     global _ffmpeg_path, _ffprobe_path
-    resolved = shutil.which(ffmpeg)
+    resolved = _resolve_media_tool(ffmpeg)
     if not resolved:
         raise RuntimeError(
             f"{ffmpeg!r} not found in PATH. "
             "Install ffmpeg or set [node] ffmpeg_path in node.toml."
         )
     _ffmpeg_path = resolved
-    resolved = shutil.which(ffprobe)
+    resolved = _resolve_media_tool(ffprobe)
     if not resolved:
         raise RuntimeError(
             f"{ffprobe!r} not found in PATH. "
             "Install ffmpeg or set [node] ffprobe_path in node.toml."
         )
     _ffprobe_path = resolved
+    log.info("media tools: ffmpeg=%s ffprobe=%s", _ffmpeg_path, _ffprobe_path)
 
 
 def ffmpeg_cmd() -> str: