* commit 'b4690091':
  build: Merge mach/mach_time.h and mach_absolute_time() checks
Merged-by: James Almer <jamrial@gmail.com>

* commit '4f6401df':
  configure: Merge separate parts of GnuTLS test
  configure: Simplify nvenc check (and move it to the correct spot)
  configure: Drop fallback for deprecated avserver command line options
  configure: Drop feature for randomly disabling/enabling components

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit '010baac1':
  configure: Fix stupid typo in gsm.h header name

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit '76481f57':
  configure: Remove pointless empty *_COMPONENTS variables
Merged-by: James Almer <jamrial@gmail.com>

* commit '1c047c8f':
  configure: Drop stray extralibs for libspeex
Merged-by: James Almer <jamrial@gmail.com>

* commit '3e595028':
  configure: Drop unused attribute checks
Merged-by: James Almer <jamrial@gmail.com>

* commit '421c10ed':
  configure: Drop test for fork()

We keep the check as it's needed by the http_multiclient example.
Merged-by: James Almer <jamrial@gmail.com>

* commit 'b586903a':
  build: Drop redundant check for soundcard.h
Merged-by: James Almer <jamrial@gmail.com>

* commit '8e97a8c6':
  build: Remove check for gsm/gsm.h for libgsm

Also includes fix from 010baac1Merged-by: James Almer <jamrial@gmail.com>

* commit '29ccc641':
  build: Drop check for sys/mman.h in favor of mmap() check
Merged-by: James Almer <jamrial@gmail.com>

* commit 'e7168d4c':
  configure: Drop redundant header check for d3d11.h
Merged-by: James Almer <jamrial@gmail.com>

* commit '4064f428':
  build: Drop explicit check for dlfcn.h
Merged-by: James Almer <jamrial@gmail.com>

* commit 'fca9ca53':
  configure: Drop unused or internally-used entries from variable lists
Merged-by: James Almer <jamrial@gmail.com>

* commit '09c98327':
  build: Drop support for Tru64 Unix (OSF/1)
Merged-by: James Almer <jamrial@gmail.com>

* commit 'ab6422e1':
  configure: rename hevc_ps to hevcparse
  extract_extradata: return an error when buffer allocation fails
  cpu: split flag checks per arch in av_cpu_max_align()
  configure: Use test_pkg_config() for the SDL check

This commit is a noop, see
3b345d38
7bae17e3Merged-by: James Almer <jamrial@gmail.com>

* commit 'd66fe7ff':
  configure: Add test_pkg_config()
Merged-by: James Almer <jamrial@gmail.com>

* commit '92f0aceb':
  cinepakenc: Move declaration out of for initialisation statement
  hapdec: Delete include for nonexistent file
  hevc: Fix aligned array declarations

This commit is a noop.
Merged-by: James Almer <jamrial@gmail.com>

* commit 'ea25ccd1':
  qsv: Join the derived session to the parent
Merged-by: James Almer <jamrial@gmail.com>

* commit 'ccbb31c1':
  qsv: Make sure the session is set with the latest version
Merged-by: James Almer <jamrial@gmail.com>

* commit '516c4791':
  checkasm: Test more h264 idct variants

See 2d263188Merged-by: James Almer <jamrial@gmail.com>

* commit '3cae7f8b':
  cbs: Add some read/write tests
  http: Reset compressed header flag when starting to read a request
  cbs_h264: Fix writing streams with auxiliary pictures
  smacker: fix integer overflow with pts_inc
  smacker: return meaningful error codes on failure
  pixdesc: Add API to map color property names to enum values

This commit is a noop, see
6f15f1cd
547b8aee
7ed47e97
624d4739
67433515
809b0402Merged-by: James Almer <jamrial@gmail.com>

* commit 'a5a6ac1a':
  libavfilter/overlay_qsv: Add QSV overlay vpp filter
  libavfilter/vf_vpp: Add common filters of the qsv vpp
Merged-by: James Almer <jamrial@gmail.com>

* commit 'ac6691ab':
  avio: update avio_alloc_context() doxy

This commit is a noop, see 877076ffMerged-by: James Almer <jamrial@gmail.com>

* commit '10eb496d':
  vaapi_mpeg2: Convert to use coded bitstream infrastructure
  mpeg12: Move finding the best frame rate to common code
  cbs_mpeg2: Add support for picture display extension
  cbs_h265: Fix ranges of prediction weight offsets
  cbs_h265: Fix reading of unknown parameter set extension data
  vaapi_h264: Fix CPB/DPB delays

This commit is a noop, see
94a40486
9b0c7aa0
686e388b
278c308c
d8928ad6Merged-by: James Almer <jamrial@gmail.com>

* commit 'f940c859':
  Revert "vaapi_h265: Reduce the amount of padding in the stream"
Merged-by: James Almer <jamrial@gmail.com>

* commit 'c42b62d1':
  h264_metadata: Fix double-free
  cbs: Add buffer padding when splitting fragments
  cbs: Always check for bitstream end before reading

This commit is a noop, see
6734eef6
b4c915f4
a308872bMerged-by: James Almer <jamrial@gmail.com>

* commit 'b05128f3':
  qsv: Load the hw hevc plugin by default on Linux
Merged-by: James Almer <jamrial@gmail.com>

* commit 'f19fbfbd':
  aviocat: Check for output write errors
Merged-by: James Almer <jamrial@gmail.com>

* commit '585dc1ae':
  flvdec: Check the avio_seek return value after reading a metadata packet

This commit is a noop, see 15537c90Merged-by: James Almer <jamrial@gmail.com>

* commit 'e12f1cd6':
  Revert "checkasm: Test more h264 idct variants"

This commit is a noop. The code is readded with minimal cosmetic
changes in a latter commit, so don't even bother removing it here.
Merged-by: James Almer <jamrial@gmail.com>

* commit '9dde6ab0':
  arm: Fix SIGBUS on ARM when compiled with binutils 2.29
Merged-by: James Almer <jamrial@gmail.com>

* commit '547db1ea':
  checkasm: Test more h264 idct variants
Merged-by: James Almer <jamrial@gmail.com>

* commit '39e16ee2':
  Revert "fate: Skip the checkasm test if CONFIG_STATIC is disabled"
Merged-by: James Almer <jamrial@gmail.com>

* commit 'accb0612':
  configure: Use dllexport/dllimport for data symbols across DLLs with mingw
Merged-by: James Almer <jamrial@gmail.com>

* commit '1a7bf48e':
  makedef: Extend the script for use with mingw tools as well
Merged-by: James Almer <jamrial@gmail.com>

* commit '44aa9105':
  makedef: Fold as much text transformations as possible into the initial dump
Merged-by: James Almer <jamrial@gmail.com>

* commit 'abf1c058':
  msvc: Properly specify dllexport for data symbols shared across dll boundaries
Merged-by: James Almer <jamrial@gmail.com>

* commit 'e41daa62':
  Remove support for building for mingw32ce (Windows CE)
Merged-by: James Almer <jamrial@gmail.com>

synth_superframe can be called twice per call to decode_packet.
It is not fully clear if calling ff_get_buffer on the same frame twice
is supported, so unref the frame first to be save.

There is no reason to keep this intact when decoding failed, specially
as private_ref is supposed to always be NULL when a frame is returned to
the user.