mov: use tkhd enabled flag to set the default track

Signed-off-by: Anton Khirnov <anton@khirnov.net>
movenc: Make tkhd "enabled" flag QuickTime compatible

QuickTime will play multiple audio tracks concurrently if this flag is
set for multiple audio tracks.  And if no subtitle track has this flag
set, QuickTime will show no subtitles in the subtitle menu.

Signed-off-by: Anton Khirnov <anton@khirnov.net>
Merge commit '1f70a5ad284b33e8b3e2b40a5cb33055419781b7'

* commit '1f70a5ad284b33e8b3e2b40a5cb33055419781b7':
  mov: use tkhd enabled flag to set the default track

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge remote-tracking branch 'qatar/master'

* qatar/master:
  movenc: Make tkhd "enabled" flag QuickTime compatible

Conflicts:
	libavformat/movenc.c
	tests/ref/acodec/alac
	tests/ref/acodec/pcm-s16be
	tests/ref/acodec/pcm-s24be
	tests/ref/acodec/pcm-s32be
	tests/ref/acodec/pcm-s8
	tests/ref/lavf/mov
	tests/ref/vsynth/vsynth1-dnxhd-1080i
	tests/ref/vsynth/vsynth1-mpeg4
	tests/ref/vsynth/vsynth1-prores
	tests/ref/vsynth/vsynth1-qtrle
	tests/ref/vsynth/vsynth1-svq1
	tests/ref/vsynth/vsynth2-dnxhd-1080i
	tests/ref/vsynth/vsynth2-mpeg4
	tests/ref/vsynth/vsynth2-prores
	tests/ref/vsynth/vsynth2-qtrle
	tests/ref/vsynth/vsynth2-svq1

Merged-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000: fix dereferencing invalid pointers

Found-by: Laurent Butti <laurentb@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000: zero reslevel array on allocation

prevent use of uninitialized values

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
jpeg2000: fix null pointer dereference in case of malloc failure

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>