[MPlayer-dev-eng] Updated video pts handling patch

[Uoti Urpala]

Filters can now insert new frames properly. I updated vf_tfields and
vf_yadif (the only existing filters which added frames) to use this
method, but did not write proper pts handling for them. They now add the
frames with a constant 0.02 second pts difference from the previous one.

I changed the pts reordering buffer to use the has_b_frames variable for
decoder lag with vd_ffmpeg. It's not quite optimal but that shouldn't
matter too much, and it avoids the messy buffer-counting code. Btw lavc
still returns the first h264 frame after seek immediately even when
has_b_frames==2 (which Michael said was a bug).

Otherwise I didn't change much from the last version and the same
limitations still exist. The frame insertion code only works if you use
the -correct-pts switch.
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