[fix #3283] adding the note to docstring (#3298)

* Adding the note to the backend function * addressing the new master change Co-authored-by: Francisco Massa <[email protected]>
pytorch · Jan 27, 2021 · 5b663c8 · 5b663c8
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commit 5b663c8
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/torchvision/__init__.py b/torchvision/__init__.py
@@ -64,6 +64,10 @@ def set_video_backend(backend):
             The :mod:`video_reader` package includes a native C++ implementation on
             top of FFMPEG libraries, and a python API of TorchScript custom operator.
             It is generally decoding faster than :mod:`pyav`, but perhaps is less robust.
+
+    .. note::
+        Building with FFMPEG is disabled by default in the latest master. If you want to use the 'video_reader'
+        backend, please compile torchvision from source.
     """
     global _video_backend
     if backend not in ["pyav", "video_reader"]: