Add ffmpeg dependency to travis

diff --git a/.travis.yml b/.travis.yml
index 7b4ec3466f551f23387311dcc2502a38f1e602bd..cd6e3afdec92dc2e53de5bef94b3a53eb07bf6cd 100644 (file)
--- a/.travis.yml
+++ b/.travis.yml
@@ -13,6 +13,7 @@ addons:
       - ubuntu-toolchain-r-test
     packages:
       - g++-4.8
+      - ffmpeg
 
 sudo: false