/usr/share/gstreamer-1.0/encoding-profiles/file-extension/mp3.gep is in pitivi 0.99-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | [GStreamer Encoding Target]
name=mp3
category=file-extension
description=Default target for files with a .mp3 extension
[profile-default]
name=default
type=container
description=Default profile for files with a .mp3 extension.
format=application/x-id3
[streamprofile-default-0]
parent=default
type=audio
format=audio/mpeg, mpegversion=(int)1, mpegaudioversion=(int)1, layer=(int)3
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