After trying with a dozen files, it seems the bs1770gain backend is much
more reliable than the audiotools backend and especially does a better
job (well, compared to audiotools which either does doing nothing at all
or throws an exception) when used on alboms that contain different
sample rates/sizes.
Additionally, we already had a few issues regarding the audiotools
backend, even to the extent that @sampsyco almost wanted to drop it
upstream (see sampsyco/beets#1342).
Also related issues are #10376 and sampsyo/beets#1592.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
Using commands such as mp3gain and aacgain is only the default for
backwards-compatible reasons. However, on Nix(OS), we would have to
either patch those tools into beets or rely on an impurity, so let's
depend on audiotools and also default to that backend.
Of course, there is also a GStreamer backend, but it comes with a hell
of additional dependencies (which not only cover audio files), which is
why I decided against defaulting to GStreamer and package audiotools
instead (in eecd932).
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
