From 6a3b77de8e0b3751441b4cd6377c6c3f43374639 Mon Sep 17 00:00:00 2001 From: nu774 Date: Fri, 25 Oct 2013 00:02:23 +0900 Subject: [PATCH] update README --- README | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/README b/README index 76ebcd1..5941539 100644 --- a/README +++ b/README @@ -34,9 +34,16 @@ MSVC solution for Visual Studio 2010 is under MSVC directory. Available input format ---------------------- -WAV (or RF64), upto 32bit int / 64bit float format is supported. -However, since FDK AAC encoder is implemented based on fixed point integer, -encoder itself treats 16bit input only. +WAV, RF64, CAF, RAW, upto 32bit int / 64bit float format is supported. +Metadata in CAF info chunk can be read and copied to the resulting m4a. +This is especially useful and works well when you pipe from ffmpeg via CAF. +For example, you can copy tag from original "foo.flac" to "foo.m4a" +through the following pipeline: + +$ ffmpeg -i foo.flac -f caf - | fdkaac -m3 - -o foo.m4a + +Since FDK AAC encoder is implemented based on fixed point integer, +encoder itself handles 16bit input only. Therefore, when feeding non-integer input, be careful so that input doesn't exceed 0dBFS to avoid hard clips. You might also want to apply dither/noise shape beforehand when your input -- 2.30.2