With the current input clock and decoder buffering code, getting large
buffers is essential. So favor that over having short audio periods.
(Ideally the audio period should probably be an half or a third of the
PTS delay, rather than hard-coded to 40 ms, but that is a separate
issue).

(cherry picked from commit 4aeccbd7667c65bd278111a26c2aab088bc60a20)