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習慣に早くから配慮した者は、 おそらく人生の実りも大きい。

ffmpeg で m4a を作る.

m4a も作れます。

ffmpeg -i input.wav -c:a libfdk_aac -b:a 128k output.m4a

ビットレート指定が必須です。

ffmpeg は libfaac


libfaac が入れられていることが重要


takuya@air:~/Desktop$ brew info  ffmpeg
ffmpeg: stable 1.2.4, devel 2.1, HEAD
http://ffmpeg.org/
/usr/local/Cellar/ffmpeg/1.2.4 (168 files, 28M) *
  Built from source with: --with-libvorbis, --with-freetype, --with-openjpeg, --with-tools, --with-ffplay, --with-rtmpdump, --with-libass, --with-openssl, --with-fdk-aac, --with-libvpx
From: https://github.com/mxcl/homebrew/commits/master/Library/Formula/ffmpeg.rb
==> Dependencies
Build: pkg-config ✔, texi2html ✔, yasm ✔
Recommended: x264 ✔, faac ✔, lame ✔, xvid ✔
Optional: freetype ✔, theora ✔, libvorbis ✔, libvpx ✔, rtmpdump ✔, opencore-amr ✔, libvo-aacenc ✔, libass ✔, openjpeg ✔, speex ✘, schroedinger ✔, fdk-aac ✔, opus ✘, frei0r ✘, libcaca ✘
==> Options
--with-fdk-aac
	Enable the Fraunhofer FDK AAC library
--with-ffplay
	Enable FFplay media player
--with-freetype
	Build with freetype support
--with-frei0r
	Build with frei0r support
--with-libass
	Enable ASS/SSA subtitle format
--with-libcaca
	Build with libcaca support
--with-libvo-aacenc
	Enable VisualOn AAC encoder
--with-libvorbis
	Build with libvorbis support
--with-libvpx
	Build with libvpx support
--with-opencore-amr
	Build with opencore-amr support
--with-openjpeg
	Enable JPEG 2000 image format
--with-openssl
	Enable SSL support
--with-opus
	Build with opus support
--with-rtmpdump
	Enable RTMP protocol
--with-schroedinger
	Enable Dirac video format
--with-speex
	Build with speex support
--with-theora
	Build with theora support
--with-tools
	Enable additional FFmpeg tools
--without-faac
	Build without faac support
--without-lame
	Disable MP3 encoder
--without-x264
	Disable H.264 encoder
--without-xvid
	Disable Xvid MPEG-4 video encoder
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