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

There are no needs to keep a copy of this on the stack. Besides, the
value could change if we supported threaded audio decoding.

tp is another extension for ts.

This occurs in case of large buffer underflow, such as if stopping the
VLC process.

Cork state could change asynchronously without the PA lock.

(Maybe the option should be renamed also)

in empty directory

Input picture to a filter is never NULL. And even if it were NULL, the
pointer is dereferenced earlier...