swscale/input: fix 16bit gbrp input

Fixes Ticket2793

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit a4b55bbb6f8ba055bba1493f6872792503e47563)

Conflicts:
	libswscale/input.c
Signed-off-by: Jean-Yves Avenard <jyavenard@mythtv.org>
mpeg12: Ignore slice threading if hwaccel is active

Slice threading does not work with hardware acceleration, as decoding
is per-picture.  This fixes Bugzilla #542.

Signed-off-by: Diego Biurrun <diego@biurrun.de>
(cherry picked from commit 93a51984a27f3ba84d4e6f13d0c704ee9891603e)

Conflicts:
	libavcodec/mpeg12dec.c
Signed-off-by: Jean-Yves Avenard <jyavenard@mythtv.org>
avformat/dtsdec: Improve probe, reject things looking like analog signals

Fixes Ticket2810

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 6663205338f57eedb2392263dde48e2717c6e980)

Conflicts:
	libavformat/dtsdec.c
Signed-off-by: Jean-Yves Avenard <jyavenard@mythtv.org>
Resync FFmpeg with stable/1.2 875649bfaef83172e44404930d755b76e36f9ba1