2.1 regression: transcode needs indirect audio conversions
The transcode plugin assumes that one "decoded" audio format can be converted to another directly. This is wrong, and it has become even more wrong with the reworked audio output in VLC 2.1.
The audio output core should be revectored to use filter chains (at last...) like the rest of the code base. Then some functions should be exported/exposed to transcode to avoid duplicated logic.