avcodec/pngdsp: fix (un)signed type in end comparission

Fixes out of array accesses
Fixes Ticket2919

Found_by: ami_stuff
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 86736f59d6a527d8bc807d09b93f971c0fe0bb07)
avformat/avidec: match first index and first packet size=0 handling

Fixes Ticket2861

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 227a0eb5a92409572f2cecde6137529b83e7d495)

Conflicts:
	libavformat/avidec.c
avcodec/h264: set er.ref_count earlier

Fixes Ticket2910

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 93cf7b01950b9d8e1646227752b522d0275d32df)
avformat/lxfdec: use a parser to parse video frame headers

lxf needs a parser (or would need to set a few fields explicitly).
Fixes Ticket2917

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 8349be852be7f68fe0590584fd46c4d5f1c16b3d)
Avoid a deadlock when decoding wma.

Fixes ticket #2925.
(cherry picked from commit ec8a4841f7e81040f9a2757f23e70dff5e6b33a4)
w64dec: fix skipping of unknown guids

Regression since 14d50c1.
Fixes #2932.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 79b70e47a463057a3a48353ee1dd58671c11f86c)
w64dec: fix end position of summarylist guid

Noticed-by: James Almer

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 3e36dc8626f4721ea749286dae40169ee5cb7d04)
Read h264 headers from v4l2 to allow stream-copying.

Fixes ticket #2882.
Analyzed and tested by William C Bonner.
(cherry picked from commit e337c9d56408dc00a15887309488a1ff5cb06ba3)
avformat/matroskaenc: remove bogus prores tag

Fixes: ffmpeg -i input -c:v prores output.mkv

Signed-off-by: Paul B Mahol <onemda@gmail.com>
(cherry picked from commit 14851ca5f5a3af140085e82589e28e06c7cdefdc)

Conflicts:
	libavformat/matroskaenc.c
doc/encoders: reformat libmp3lame doc

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
(cherry picked from commit 40b8350b57adaa9aaf6731bac5130d4fec1639c3)

Conflicts:
	doc/encoders.texi
doc/encoders: reformat and add some clarification in libtwolame doc

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
Signed-off-by: Stefano Sabatini <stefasab@gmail.com>
(cherry picked from commit e45e72f5f89ef5a5791562cfcb935028b46ecd0a)

Signed-off-by: Timothy Gu <timothygu99@gmail.com>
doc/encoders: Remove options that were not there when branch was cut from master

Signed-off-by: Timothy Gu <timothygu99@gmail.com>