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    <p>I've found ffmpeg will translate caf files with a data format of aac. I'm capturing voice on the iPhone in AAC format at 22050Hz, 1 channel. Server side I can translate it to .wav format with ffmpeg and then to .mp3 with sox.</p> <p>The following shows the configuration for ffmpeg running under FreeBSD.</p> <pre><code>%ffmpeg -i test_aac_22050_1.caf test_pcm_22050_1.wav FFmpeg version 0.6.3, Copyright (c) 2000-2010 the FFmpeg developers built on Jul 7 2011 16:16:19 with gcc 4.2.1 20070719 [FreeBSD] configuration: --prefix=/usr/local --mandir=/usr/local/man --enable-shared --enable- gpl --enable-postproc --enable-avfilter --enable-avfilter-lavf --enable-pthreads --enable-x11grab --enable-memalign-hack --cc=cc --extra-cflags=-I/usr/local/include/vorbis -I/usr/local/include --extra-ldflags=-L/usr/local/lib --extra-libs=-pthread --disable-debug --enable-runtime-cpudetect --disable-sse --disable-mmx --disable-indev=alsa --disable-outdev=alsa --disable-libopencore-amrnb --disable-libopencore-amrwb --disable-libdirac --enable-libfaac --enable-nonfree --enable-libfaad --enable-libfaadbin --disable-libgsm --disable-libmp3lame --disable-libopenjpeg --enable-libschroedinger --disable-ffplay --disable-libspeex --enable-libtheora --disable-vaapi --disable-vdpau --enable-libvorbis --enable-libvpx --enable-libx264 --enable-libxvid libavutil 50.15. 1 / 50.15. 1 libavcodec 52.72. 2 / 52.72. 2 libavformat 52.64. 2 / 52.64. 2 libavdevice 52. 2. 0 / 52. 2. 0 libavfilter 1.19. 0 / 1.19. 0 libswscale 0.11. 0 / 0.11. 0 libpostproc 51. 2. 0 / 51. 2. 0 Input #0, caf, from 'test_aac_22050_1.caf': Duration: 00:00:09.89, start: 0.000000, bitrate: 44 kb/s Stream #0.0: Audio: aac, 22050 Hz, mono, s16, 30 kb/s Output #0, wav, to 'test_pcm_22050_1.wav': Metadata: encoder : Lavf52.64.2 Stream #0.0: Audio: pcm_s16le, 22050 Hz, mono, s16, 352 kb/s Stream mapping: Stream #0.0 -&gt; #0.0 Press [q] to stop encoding size= 426kB time=9.89 bitrate= 352.8kbits/s video:0kB audio:426kB global headers:0kB muxing overhead 0.010087% </code></pre> <p>And confirming the output:</p> <pre><code>%file test_pcm_22050_1.wav test_pcm_22050_1.wav: RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, mono 22050 Hz </code></pre>
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