Fixes ticket #2731.

Fixes ticket #2157.

* qatar/master:
  avframe: have av_frame_get_side_data take const AVFrame*
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'ee37d581':
  rtpproto: Allow specifying a separate rtcp port in ff_rtp_set_remote_url
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '1851e1d0':
  rtpproto: Check the size before reading buf[1]
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '7748dd41':
  avconv: add -n option to immediately exit when output files already exist

Conflicts:
	Changelog
	doc/ffmpeg.texi
	ffmpeg_opt.c

See: 0a4f0211Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'b85dbe68':
  avconv: Call exit_program instead of exit in avconv_opt as well

Conflicts:
	ffmpeg_opt.c

See: eeddeb65Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'c7e921a5':
  avopt: Check whether the object actually has got an AVClass

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

* commit 'b7e6da98':
  rtpproto: Move rtpproto specific function declarations to a separate header
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '892b0be1':
  rtpproto: Simplify the rtp_read function by looping over the fds
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '7531588f':
  rtpproto: Remove a misplaced comment
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '54e03ff6':
  rtpproto: Support nonblocking reads
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '2e814d03':
  rtpenc: Simplify code by introducing a macro for rescaling NTP timestamps
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit '45dd1ae1':
  avfilter: Add some missing FF_API_AVFILTERBUFFER ifdefs

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

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

* commit 'c2e936de':
  tree-test: Refactor and plug memory leaks

Conflicts:
	libavutil/tree.c

Most of this commit is not merged due to bugs in it
Merged-by: Michael Niedermayer <michaelni@gmx.at>

* commit 'a9b04b2c':
  tree.h: K&R formatting and typo cosmetics
Merged-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Anton Khirnov <anton@khirnov.net>

A separate rtcp port can already be set when opening the rtp
protocol normally, but when doing port setup as in RTSP (where
we first need to open the local ports and pass them to the peer,
and only then receive the remote peer port numbers), we didn't
check the same url parameter as in the normal open routine.
Signed-off-by: Martin Storsjö <martin@martin.st>

I doubt that anyone ever would try to send a 1 byte packet
via the RTP protocol, but check just in case - it shouldn't
crash at least.
Signed-off-by: Martin Storsjö <martin@martin.st>

Reviewed-by: Stefano Sabatini <stefasab@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Martin Storsjö <martin@martin.st>

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

Interruptibility of file operations is strongly desirable in case of
slow storage access, e.g. mounted network share.
This commit introduces possibility to limit data quantity transferred by
'file' protocol at once. By default, old behaviour is preserved and data
is still tried to be transferred without block size limitation.

Note that file I/O operation still may block (or even freeze) inside of
single read(2) or write(2) operation.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

This seems to have been missed in 636ced8e.
Signed-off-by: Martin Storsjö <martin@martin.st>

AVIOContext has got an av_class member that only gets set if
opening the context using avio_open2, but not if allocating a
custom IO context. A caller that wants to read AVOptions from
an AVIOContext (recursively using AV_OPT_SEARCH_CHILDREN) may
not know if the AVIOContext actually has got a class set or not.
Signed-off-by: Martin Storsjö <martin@martin.st>

Mixing these with the rtp depacketizer functions in rtpdec.h is
no good.
Signed-off-by: Martin Storsjö <martin@martin.st>

This avoids having duplicate code where only the fd parameter
differs.
Signed-off-by: Martin Storsjö <martin@martin.st>

The fdset is a pollfd array nowadays, and it is already populated
at this point.
Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

With the most annoying memory leak found by Derek Buitenhuis.