ffmpeg: add caveats to document AAC encoder switch

1 files changed, 12 insertions, 0 deletions

diff --git a/Library/Formula/ffmpeg.rb b/Library/Formula/ffmpeg.rb
index b8dafc961..591225ca8 100644
--- a/Library/Formula/ffmpeg.rb
+++ b/Library/Formula/ffmpeg.rb
@@ -155,4 +155,16 @@ class Ffmpeg < Formula
     end
   end
 
+  def caveats; <<-EOS.undent
+    FFmpeg has been built without libfaac for licensing reasons.
+    To install with libfaac, you can:
+      brew reinstall ffmpeg --with-faac
+
+    You can also use the libvo-acenc or experimental FFmpeg encoder to
+    encode AAC audio:
+      -c:a libvo_aacenc
+    Or:
+      -c:a aac -strict -2
+    EOS
+  end unless build.with? "faac"
 end