- simplify "audio-filter" parser and fix a tautology
 - keep a single pointer for the resampler instead of a table

Use input rate rather than output rate to avoid extra resampling.

Objects cannot be detached anymore...

This enables to show UTF-8 subtitles even though subsdec-encoding is set to
a non-UTF-8 value.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

There should never be a need for more than 5 of them. Only the
filters proper might require more than 5 members in a chain.

Usage: --avio-options={foo=bar,few=baz}