Replace the inline awk script with a Perl script which tracks the
dependencies recursively.

This allows to correctly track dependencies for files including files
with a second level include (for example: ffmpeg-devices.texi ->
devices.texi -> outdevs.texi).

This also adds a dependency on perl for computing the dependencies, which
should not be a problem since perl is already required all the way for
building documentation.

This is a variant of commit 628ceac6
which was reverted due to out-of-tree build failure.

* commit '6d70639c':
  mjpegenc: do not pass MpegEncContext to jpeg_table_header()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e1eaaec7':
  mjpegenc: remove commented out never-to-be-finished WIP cruft

Conflicts:
	libavcodec/mjpegenc.c

The unfinished 2-matrix code is left in place and not removed
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ff506c75':
  mjpegenc: do not pass MpegEncContext to put_huffman_table()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a1ba1f20':
  mjpegenc: cosmetics, reformat jpeg_put_comments()

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

* commit '0812f5a4':
  mjpegenc: write the JFIF header if the sample aspect ratio is set

Conflicts:
	libavcodec/mjpegenc.c

See: f3ce748dMerged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '66499f34':
  mpegvideo: do not set current_picture_ptr in decoders

Conflicts:
	libavcodec/mss2.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '58a86896':
  FATE: drop the last partial frame in the wmv8-drm test

Conflicts:
	tests/ref/fate/wmv8-drm
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ac1fc92e':
  vc1dec: move setting repeat_pict after frame_start() has been called.

Conflicts:
	libavcodec/vc1dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '282c6a1a':
  mpegvideo: make ff_release_unused_pictures() static
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'c99307ca':
  mpegvideo: make frame_size_alloc() static.
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '0b0a7a75':
  mpegvideo: move encode-only parts of common_end() to encode_end()

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

* commit 'd0d111d0':
  mpegvideo: remove commented out cruft from ff_MPV_frame_end()

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

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

* commit '381a7225':
  mpegvideo: split the encoding-only parts of ff_MPV_frame_end() into a separate function

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

* commit 'b7254288':
  mpegvideo: do not update last_non_b_pict_type in update_thread_context()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '1f8eb690':
  mpegvideo: move encoding-only initialization from common_init() to encode_init()

Conflicts:
	libavcodec/mpegvideo.c
	libavcodec/mpegvideo_enc.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'bedf952b':
  mpegvideo: move setting encoding-only vars from common_defaults() to encode_defaults()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '2cab011f':
  mpegvideo: don't copy input_picture_number in update_thread_context()
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ff7ffe48':
  mpeg4videodec: move showed_packed_warning from MpegEncContext to Mpeg4DecContext

Conflicts:
	libavcodec/mpeg4videodec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'f7d22867':
  mpeg4videodec: move intra_dc_threshold from MpegEncContext to Mpeg4DecContext

Conflicts:
	libavcodec/mpeg4videodec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a097f004':
  mpeg12dec: move first_slice from MpegEncContext to Mpeg1Context

Conflicts:
	libavcodec/mpeg12dec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ff300e43':
  mpegvideo: remove an unused variable
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'e41ff421':
  mpeg4videodec: move use_intra_dc_vlc from MpegEncContext to Mpeg4DecContext

Conflicts:
	libavcodec/mpeg4videodec.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Originally written by James Almer <jamrial@gmail.com>

With the following contributions by Timothy Gu <timothygu99@gmail.com>

* Use descriptions of libraries from the pkg-config file generation function
* Use "FFmpeg Project" as CompanyName (suggested by Alexander Strasser)
* Use "FFmpeg" for ProductName as MSDN says "name of the product with which the
  file is distributed" [1].
* Use FFmpeg's version (N-xxxxx-gxxxxxxx) for ProductVersion per MSDN [1].
* Only build the .rc files when --enable-small is not enabled.

[1] http://msdn.microsoft.com/en-us/library/windows/desktop/aa381058.aspxSigned-off-by: James Almer <jamrial@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes ticket #3195.

This reduces the amount of frames that need to be demuxed in av_find_stream_info()
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

This reduces the number of operations done per non zero coefficient
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Pass the three needed fields from it directly.
This will allow to deMpegEncContextize the LJPEG encoder.

It only needs PutBitContext from it, so pass that directly.

MpegEncContext.aspect_ratio_info is never set for mjpeg, so this was
never written before.

This code was originally added in
5f194811 to h263 to set decoded frame
pts to some random numbers (removed in
a1c5cc42) and then cargo culted to other
decoders.

The code is left in h263dec for now, since some part of the decoder
(apparently OBMC) relies on the specific previous frame to be reused.

This has already been done in eb066a4c,
but the number of frames produced from that file changed due to
timestamps changes since then.

This will allow removing the hacks where each decoder sets
current_picture_ptr on its own.

It is only called from one place in mpegvideo.c now. Also remove the
remove_current parameter, which is always 1.

It is not called from outside of mpegvideo.c anymore.