/usr/share/avconv/libx264-ipod320.avpreset is in libav-tools 4:0.8.17-0ubuntu0.12.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 | profile=baseline
level=13
maxrate=768000
bufsize=3000000
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