I wanted to extend the range of videos that we can accept inside ShowMeDo’s uploader/processor, in particular several users have uploaded mp4 video and mp4a audio which our ffmpeg didn’t understand.
To enable mp4a decoding I needed to compile libfaad/libfaac on our RedHat box, here are the instructions. Note that libfaac is required – I tried it without and mp4a wasn’t in the list of codecs (ffmpeg -formats). See e.g. this forum post.
This builds upon my Compiling LAME on RedHat and Compiling ffmpeg on RedHat articles.
libfaad is a part of the open-source FAAC project (wikipedia) – the ‘c’ is the encoder, the ‘d’ is the decoder. First I fetched faad2-src from sourceforge.
Using the existing ~/tmp directory I exported it again for this session:
export TMPDIR=~/tmp
and then ran:
autoreconf -vif
./configure --with-mp4v2 --prefix=$HOME
make
make install
Afterwards my ~/lib contained libfaad.a/.so etc.
Next I fetched faac-src and used:
./configure --with-mp4v2 --prefix=$HOME
make
make install
and the result was libfaac in ~/lib.
Related posts:
[...] didn’t support libfaac/libfaad for mp4 audio/video support. To fix that first I compiled the libfaac and libfaad libraries, then updated our ffmpeg [...]