Do not overwrite VDPAU structures in ff_MPV_frame_start().

Fixes crashes with VDR and MPlayer as reported by irc user crow.
(cherry picked from commit 941b2240f2ce59c41f4a9ffec88c512f64c75613)
ff_id3v2_free_extra_meta: set the pointer pointing to extra_meta to NULL

Fixes ticket #3530.

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit c94305ae23318c8956a30485cd5642829f4f16a9)
ff_id3v2_read: add option to limit ID3 magic number search

Several chunked formats (AIFF, IFF,DSF) store ID3 metadata within an 'ID3 '
chunk tag. If such chunks are stored sequentially, it is possible for the
ID3v2 parser to confuse the chunk tag for the ID3 magic number. e.g.

[1st chunk tag ('ID3 ') | chunk size] [ID3 magic number | metadata ...]
[2nd chunk tag ('ID3 ') | chunk size] [ID3 magic number | metadata ...]

Fixes ticket #3530.

Signed-off-by: Peter Ross <pross@xvid.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5331773cc33ba26b9e26ace643d926219e46a17b)

Conflicts:
	libavformat/dsfdec.c
avformat: Fix decoder search in find stream info

Fixes Ticket3548

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit f3743901d7df906342f99b179382b19d8a4d9716)
avformat/pmpdec: remove cur_dts timestamp hack

It appears the demuxer works fine without it

Fixes Ticket3534

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 5b19fc7aae986d6fa3d689f581b37e4bfba4f2d0)
avformat/asfenc: dont allow non interleaved packets

The muxer does not support this currently

Fixes ticket #3547.
Fixes ticket #3555.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 369cdf917aaa5d7fbc61d57f87e638772e806716)
(cherry picked from commit 514ec9bece86fed440ac829c10e82c4a0569c3a5)
ffprobe: fix scaling of vali in value_string() in case -prefix is selected

Fix trac ticket #3523.
(cherry picked from commit 1ba59b1cbeafe7cd28db04f772abd89eb7e4ce1e)
avformat/avidec: Speed up keyframe detection code

Fixes Ticket3531

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 57fb570908df2e84b11635f12b5be1fb27f053eb)
avformat/mux: Check for and remove invalid packet durations

Fixes assertion failure
Fixes Ticket3575

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit dc6a17cf74a90e41d70ea1753cdb70c0a5b2ced8)
swresample: fix AV_CH_LAYOUT_STEREO_DOWNMIX input

Fixes Ticket 3542

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 291d464161a5bf3b566bc147f83e4242b0c18d74)