When the pool is released, the pictures were destroyed only once all
references to all pooled pictures were released. Now, each picture is
destroyed individually when it is no longer referenced.

This path is about the current input thread, not about playlist
items.

Supports H.264, mp4v, H.263 and DV depending on Darwin flavor and version

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

Prevent contribs from picking up the dependency here.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

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

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

This leads to very inconsistent behaviour on WASAPI and PulseAudio.

This reverts commit 1d7c5598.