Document video hardware acceleration.

diff --git a/video.rst b/video.rst
index 5af1ef64432ffb7c3bac1374b1e3050a06956083..40dfd5ad102e6f63cffbd00c1cb965bb1a040eab 100644 (file)
--- a/video.rst
+++ b/video.rst
@@ -25,7 +25,9 @@ Adding video to an existing chain happens in two phases; first, the video
 must be *loaded*, giving it an identifier, and then that video can be used
 as inputs in a chain, much like :ref:`images <images>` or regular live inputs.
 Anything FFmpeg accepts, including network streams, can be used (probably even
-V4L input cards, although this is untested).
+V4L input cards, although this is untested). Video hardware acceleration is used
+if available, although the decoded data currently takes a round trip through
+the GPU.
 
 When loading a video, you need to decide what format to use; Y'CbCr or BGRA.
 (Whatever you choose, if you get a mismatch with what the video actually is in,