If a packet is not ready on the input selected by ffmpeg,
it will read from another input instead. If that happens
repeatedly, frames will accumulate somewhere later in the
processing to ensure streams synchronization. It can happen
in particular when reading from a slow medium or an
expensive lavfi filter graph.

Make reading from normal demuxers on non-streamed data and
from the lavfi pseudo-device blocking to avoid that.

Should fix trac ticket #3079.

Fixes out of array read
Fixes: 08e48e9daae7d8f8ab6dbe3919e797e5-asan_heap-oob_157461c_5295_cov_1266798650_firefing.mpg
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* cigaes/master:
  lavfi/pan: use extended_data instead of data.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket3329
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  libavformat/mpegts: expose raw packet size

Conflicts:
	libavformat/mpegts.c

See: f9b997c3Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'c3ecd968':
  AVOptions: add flags for read/read-only options

Conflicts:
	libavutil/opt.c
	libavutil/opt.h
	libavutil/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '6bb8720f':
  AVOptions: deprecate unused AV_OPT_FLAG_METADATA

Conflicts:
	doc/APIchanges
	libavutil/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  hevc: Always consider VLC NALU type mismatch fatal
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '175e5063':
  hevc: Mention the missing SPS in the error message
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '93632a70':
  doc: Name the MOV muxer as it should be called

Conflicts:
	doc/muxers.texi
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a7b3216c':
  doc: Sort the muxer documentation

Conflicts:
	doc/muxers.texi

No change as ours was already sorted
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '874c751c':
  threads: Check w32threads dependencies at the configure stage
Merged-by: Michael Niedermayer <michaelni@gmx.at>

We cannot easily determine if an mpeg TS's packet size is DVHS, FEC
or so on, for that we need to expose the internal raw_packet_size
field.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

It was never used since it was added and the things it was intended for
are now exported differently.

This also fixes a null pointer dereference with rgb and plane prediction
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes make checkheaders without decklink headers.

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

avformat/utils: av_guess_frame_rate() favor avg_frame_rate if r_frame_rate has a comparably unlikely value

Fixes Ticket3399
Fixes Ticket2958
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes compilation with --disable-everything --enable-filter=dctdnoiz

Sample-Id: 00001667-google
Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org

The section name is the muxer, not the format.

Keep the sections alphabetically sorted.

* qatar/master:
  vf_interlace: deprecate lowpass option

Conflicts:
	libavfilter/version.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'b23bc959':
  x86: dca: Add missing multiple inclusion guards
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Also add warning comment about threading implementations without matching
atomics implementation to the atomics fallback implementation.

* commit '294a51e1':
  gitignore: Add all examples below doc/examples
Merged-by: Michael Niedermayer <michaelni@gmx.at>

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

* commit '1e142d5b':
  movenc: Add a fallback fragmentation method for plain mp4 as well

Conflicts:
	libavformat/movenc.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '543156d7':
  arm: Mark the stack as non-executable
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes division by 0
Fixes: 3c980274cecaca6ca5d6e517c0c1983e-signal_sigabrt_7ffff7125425_410_cov_3621042467_2_audio_streams.avi
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fix trac ticket #3380.

Previously the default fragmentation method was only enabled
if writing an ISM file.
Signed-off-by: Martin Storsjö <martin@martin.st>

If linking in an object file without this attribute set, the
linker will assume that an executable stack might be needed.
Signed-off-by: Martin Storsjö <martin@martin.st>

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