ffmpeg 3.0

https://github.com/FFmpeg/FFmpeg/releases/tag/n3.0.

FFmpeg 3.0 dropped support for several external libraries; relevant to
this formula are libvo-aacenv and libquvi. See
Changelog (https://github.com/FFmpeg/FFmpeg/blob/n3.0/Changelog#L4-L71)
for details.

Developments on the AAC encoding front are especially notable. To quote
two official announcements:

(TL;DR: 1. The native FFmpeg AAC encoder has gone stable, and it has
           the advantage of being un-license-encumbered;
        2. If you are currently using libvo-aacenc or libaacplus,
           consider switching to aac or libfdk_aac. aac is almost a
           drop-in replacement for libvo-aacenc; fdk-aac is better than
           aacplus but you need to learn profiles and options.)

  December 5th, 2015, The native FFmpeg AAC encoder is now
  stable! (https://ffmpeg.org/index.html#aac_encoder_stable):

    After seven years the native FFmpeg AAC encoder has had its
    experimental flag removed and declared as ready for general use. The
    encoder is transparent at 128kbps for most samples tested with
    artifacts only appearing in extreme cases. Subjective quality tests
    put the encoder to be of equal or greater quality than most of the
    other encoders available to the public.

    Licensing has always been an issue with encoding AAC audio as most
    of the encoders have had a license making FFmpeg unredistributable
    if compiled with support for them. The fact that there now exists a
    fully open and truly free AAC encoder integrated directly within the
    project means a lot to those who wish to use accepted and widespread
    standards.

    ...

  January 30, 2016, Removing support for two external AAC
  encoders (https://ffmpeg.org/index.html#removing_external_aac_encoders):

    ...

    The circumstances for both have changed. After the work
    spearheaded by Rostislav Pehlivanov and Claudio Freire, the
    now-stable FFmpeg native AAC encoder is ready to compete with much
    more mature encoders. The Fraunhofer FDK AAC Codec Library for
    Android was added in 2012 as the fourth supported external AAC
    encoder, and the one with the best quality and the most features
    supported, including HE-AAC and HE-AACv2.

    Therefore, we have decided that it is time to remove libvo-aacenc
    and libaacplus. If you are currently using libvo-aacenc, prepare to
    transition to the native encoder (aac) when updating to the next
    version of FFmpeg. In most cases it is as simple as merely swapping
    the encoder name. If you are currently using libaacplus, start using
    FDK AAC (libfdk_aac) with an appropriate profile option to select
    the exact AAC profile that fits your needs. In both cases, you will
    enjoy an audible quality improvement and as well as fewer licensing
    headaches.

Formula/ffmpeg.rb

@@ -1,8 +1,8 @@
 class Ffmpeg < Formula
   desc "Play, record, convert, and stream audio and video"
   homepage "https://ffmpeg.org/"
-  url "https://ffmpeg.org/releases/ffmpeg-2.8.6.tar.bz2"
-  sha256 "40611e329bc354592c6f8f1deb033c31b91f80e91f5707ca4f9afceca78d8e62"
+  url "https://ffmpeg.org/releases/ffmpeg-3.0.tar.bz2"
+  sha256 "f19ff77a2f7f736a41dd1499eef4784bf3cb7461f07c13a268164823590113c0"
   head "https://github.com/FFmpeg/FFmpeg.git"
 
   bottle do
@@ -13,7 +13,6 @@ class Ffmpeg < Formula
 
   option "without-x264", "Disable H.264 encoder"
   option "without-lame", "Disable MP3 encoder"
-  option "without-libvo-aacenc", "Disable VisualOn AAC encoder"
   option "without-xvid", "Disable Xvid MPEG-4 video encoder"
   option "without-qtkit", "Disable deprecated QuickTime framework"
 
@@ -43,7 +42,6 @@ class Ffmpeg < Formula
 
   depends_on "x264" => :recommended
   depends_on "lame" => :recommended
-  depends_on "libvo-aacenc" => :recommended
   depends_on "xvid" => :recommended
 
   depends_on "faac" => :optional
@@ -66,7 +64,6 @@ class Ffmpeg < Formula
   depends_on "libcaca" => :optional
   depends_on "libbluray" => :optional
   depends_on "libsoxr" => :optional
-  depends_on "libquvi" => :optional
   depends_on "libvidstab" => :optional
   depends_on "x265" => :optional
   depends_on "openssl" => :optional
@@ -93,7 +90,6 @@ class Ffmpeg < Formula
 
     args << "--enable-libx264" if build.with? "x264"
     args << "--enable-libmp3lame" if build.with? "lame"
-    args << "--enable-libvo-aacenc" if build.with? "libvo-aacenc"
     args << "--enable-libxvid" if build.with? "xvid"
     args << "--enable-libsnappy" if build.with? "snappy"
 
@@ -116,7 +112,6 @@ class Ffmpeg < Formula
     args << "--enable-frei0r" if build.with? "frei0r"
     args << "--enable-libcaca" if build.with? "libcaca"
     args << "--enable-libsoxr" if build.with? "libsoxr"
-    args << "--enable-libquvi" if build.with? "libquvi"
     args << "--enable-libvidstab" if build.with? "libvidstab"
     args << "--enable-libx265" if build.with? "x265"
     args << "--enable-libwebp" if build.with? "webp"
@@ -172,17 +167,17 @@ class Ffmpeg < Formula
 
   def caveats
     if build.without? "faac" then <<-EOS.undent
-      FFmpeg has been built without libfaac for licensing reasons;
-      libvo-aacenc is used by default.
-      To install with libfaac, you can:
-        brew reinstall ffmpeg --with-faac
+      The native FFmpeg AAC encoder has been stable since FFmpeg 3.0. If you
+      were using libvo-aacenc or libaacplus, both of which have been dropped in
+      FFmpeg 3.0, please consider switching to the native encoder (-c:a aac),
+      fdk-aac (-c:a libfdk_aac, ffmpeg needs to be installed with the
+      --with-fdk-aac option), or faac (-c:a libfaac, ffmpeg needs to be
+      installed with the --with-faac option).
 
-      You can also use the experimental FFmpeg encoder, libfdk-aac, or
-      libvo_aacenc to encode AAC audio:
-        ffmpeg -i input.wav -c:a aac -strict experimental output.m4a
-      Or:
-        brew reinstall ffmpeg --with-fdk-aac
-        ffmpeg -i input.wav -c:a libfdk_aac output.m4a
+      See the announcement
+      https://ffmpeg.org/index.html#removing_external_aac_encoders for details,
+      and https://trac.ffmpeg.org/wiki/Encode/AAC on best practices of encoding
+      AAC with FFmpeg.
       EOS
     end
   end