(Cset 1a0447486a13 broke things differently.)

This has a side effect: versions older than 1.1.10 do not unescape, so
"#save:foo%23.ts" will result in a file named "foo%23.ts".
Front end maintainers, beware :-)

This was broken in 1.1.8 when #subtitle:/file was fixed.

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supply decoded frames.
There can still be scheduling delays which may let the number of
frames ready for displaying to drop below frame drop limit just
for a short period of time.
Therefore the changes remember that the decoder should have been
asked to drop some frames but do not actually have the decoder to
drop some frames. When the situation has improved at the next time
when the check is performed, the remembered frame drop is canceled
or otherwise (when the number of frames is still below frame drop
limit) executed.
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allocated frames.
The current code uses a hard coded frame drop limit of 3 and
doesn't adhere to it's documentation when testing whether frames
shall be dropped. As a result frame drop limit is actually 4,
which means that the decoder is asked to drop some frames when
the number of frames waiting for displaying is less then 4.
Consider a video out device like xxmc which only supplies 8
frames. For MPEG2 decoding, two frames will be used by the
decoder (for the current frame and the forward reference frame)
and two further frames will be used in the video out loop (the
current and the previous frame) so that at any given time (under
perfect conditions) there will be 4 frames waiting to be displayed.
But when there are delays in scheduling, it might happen that
there are only 3 frames ready for displaying and thus will result
in asking the decoder to drop frames.
The changes therefore determine the maximum frame drop limit in
dependence of the number of allocated frames and make the
detection work like documented. In the above scenario, the maximum
number actually used for frame drop limit will then be 2 which
allows to compensate some scheduling delays without causing the
decoder to drop frames.
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available.
Usually it's a good idea to avoid reallocating frames especially
when a deinterlacer needs a different format than the decoder, as
this would then happen all the time.
But when there is only a limited number of frames available, then
even a single frame which is not scheduled at frame allocation may
let the number of frames ready for displaying drop below frame
drop limit and thus resulting in unnecessary frame drops.
(transplanted from 235058555243755d3aebff03d898f1a5b94ff95e)

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extra : transplant_source : %23PXURCu%5D%3A%EB%FF%03%D8%98%F1%A5%B9O%F9%5E