Add flags field to Writer, and define the
WRITER_FLAG_DISPLAY_OPTIONAL_FIELDS flag which forces the display of
optional fields, for example non-available or invalid fields.

Also set the flag in the default writer.

This change is required as for some writers it is preferable to show all
fields (for example for avoiding a variable number of fields in CSV
output), while for other formats (e.g. JSON, XML) it is better to leave
invalid/unavailable fields unspecified and thus simplify the parsing
stage on the deserializer side.

Thus use unaligned accesses.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes Ticket650
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This avoids banding artifacts.
Note, low end TFTs still show some banding.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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

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

The Apple HTTP Live Streaming demuxer's implementation of seeking searches for
the MPEG TS segment which contains the requested timestamp.  In its current
implementation it assumes that the first segment will start from 0.

But, MPEG TS streams do not necessarily start with timestamp (near) 0, causing
seeking to fail for those streams.

This also occurs when using live streaming of HTTP Live Streams. In this case
sliding playlists may be used, which means that in that case only the last x
encoded segments are stored, the earlier segments get deleted from disk and
removed from the playlist. Because of this, when starting playback of a stream
in the middle of such a broadcast, the initial segment fetched after parsing
the m3u8 playlist will not start from timestamp (near) 0, causing (the
admittedly limited live) seeking to fail.

This patch changes this demuxers seeking implementation to use the initial DTS
as an offset for searching the segments containing the requested timestamp.

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

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

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

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

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

 fields to be perfectly fine mpeg TS.
Fixes Ticket580
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

* qatar/master:
  binkvideo: simplify and remove invalid shifts
  pulse: compute frame_duration once and fix it
  lavf: simplify format_child_class_next()
  hwaccel: OS X Video Decoder Acceleration (VDA) support.
  doc: add support for an optional navigation bar in texi2html pages

Conflicts:
	configure
	libavcodec/Makefile
	libavcodec/allcodecs.c
	libavcodec/vda.c
	libavcodec/vda.h
	libavcodec/vda_h264.c
	libavcodec/vda_internal.h
	libavcodec/version.h
	libavformat/options.c
	libavutil/avutil.h
	libavutil/pixfmt.h
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Fixes remaining complaints in Ticket560 possibly.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

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 reverts part of:
	commit e65ab9d9
	Author: Mans Rullgard <mans@mansr.com>
	Date:   Wed Jun 1 17:26:27 2011 +0100

	    Remove unused variables

The crash occurrs when a frame is successfully decoded, but no decoded
data is immediately available (typically happens with ogg/vorbis).

This allows an appropriate behaviour when it is not specified (fallback
to the number of input channels).

Fixes Ticket523

Might Fix Ticket431
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 improves data cache hits and speeds up grayscale only decoding
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixed Ticket636
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Mans Rullgard <mans@mansr.com>

The frame duration was calculated without taking in account the
bytes per sample.

Thanks to Lorenzo Pistone <blaffablaffa@gmail.com> for pointing
the issue and providing an initial fix.

And fix the error introduced when adding private option to avio.
See 32caa7b1

Signed-off-by: Luca Barbato <lu_zero@gentoo.org>