diff --git a/polysemy-video.cabal b/polysemy-video.cabal
--- a/polysemy-video.cabal
+++ b/polysemy-video.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           polysemy-video
-version:        0.1.1.0
+version:        0.1.2.0
 description:    Experimental video processing DSL for polysemy.
 category:       video polysemy
 author:         Daniel Firth
diff --git a/src/Polysemy/Video.hs b/src/Polysemy/Video.hs
--- a/src/Polysemy/Video.hs
+++ b/src/Polysemy/Video.hs
@@ -69,7 +69,7 @@
 
 -- | "ffmpeg -y" followed by some arguments.
 runffmpeg :: MonadIO m => [Text] -> m ()
-runffmpeg xs = S.sh $ S.inproc "ffmpeg" ("-y" : xs) mempty
+runffmpeg xs = S.sh $ S.inproc "ffmpeg" ("-y" : "-loglevel" : "warning" : xs) mempty
 
 -- | "mkdir -p" with a `Path b Dir`.
 mktreeFP :: MonadIO m => Path b Dir -> m ()