Between yesterday and today I started playing and integrating some known
memory allocators that provide a mean to have a realigned malloc.

Here some numbers from an h264 + ac3 in mkv file

./avconv_normal
bench: utime=140.790s maxrss=30508kB
./avconv_tlsf
bench: utime=140.026s maxrss=46428kB
./avconv_jemalloc
bench: utime=137.821s maxrss=56532kB

jemalloc is surprisingly fast, tlsf is slightly faster than the normal
dlmalloc used in glibc.
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