Fix remuxing H.264-in-MP4 to Matroska, possibly others.

Clearing the extradata is not related to the codecpar change,
and it breaks if auto_convert is disabled.

Fix trac ticket #5461.

* commit 'e42ca48a':
  svq3: rip out the mb decoding code shared with h264
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'e481458b':
  h264: factor out pred weight table parsing into a separate file
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '90ed6c5c':
  h2645_parse: compute the actual data length, without trailing paddding
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'b667252a':
  h2645_parse: add support for parsing h264
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '52ec149f':
  h2645_parse: change the AVCodecContext* parameter to void*
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '8229eff4':
  h2645_parse: add a function for uninitializing the packet
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'fa936a30':
  hevc_parse: rename into h2645_parse
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Fixes slice threading.
Signed-off-by: James Almer <jamrial@gmail.com>

It's not even used anymore, and the checks are no longer
functionally important.
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Fixes Ticket5319
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Functionality used before didn't widen the values from limited to
full range. Additionally, now the decoder uses BT.709 where it
should be used according to the video resolution.

Default for not yet set colorimetry is BT.709 due to most observed
HDMV content being HD.

BT.709 coefficients were gathered from the first two parts of BT.709
to BT.2020 conversion guide in ARIB STD-B62 (Pt. 1, Chapter 6.2.2).
They were additionally confirmed by manually calculating values.

Fixes #4637

* commit 'cdb1665f':
  aarch64: Make transpose_4x4H do a regular transpose
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

This merge is a no-op.

* commit 'edf54887':
  rtpdec_jpeg: fix low contrast image on low quality setting
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '15932389':
  intrax8: Add a local BlockDSPContext and initialize it
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '1eaae7ab':
  intrax8: Reference the current AVCodecContext
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '8072345e':
  intrax8: Keep a reference to the GetBitContext reader
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '65f14128':
  intrax8: Use a constant buffer instead of a ScratchpadContext
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'eaeba6f2':
  intrax8: Pass the output frame to the decoding function
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '57739332':
  intrax8: Carry over the loopfilter value in ff_intrax8_decode_picture
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '68127e1b':
  intrax8: Keep a reference to the context idctdsp
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '65127450':
  intrax8: Make x8_init_block_index not use mpegvideo fields
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit '922b7e6d':
  intrax8: Use local destination buffers
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'a7da517f':
  h264data: Move all data tables from a header to a .c file
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

* commit 'f4d581cd':
  lavc: Deduplicate zigzag_scan table
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Fixes segfault
Fixes Ticket5347
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

* commit '02cd8bb9':
  h264: Clean up #includes
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Fixes null pointer dereference
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

This fixes demuxing of 01c56b0dc1.ts
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

avcodec/utils: Assert that the number of consumed bytes in avcodec_decode_audio4() is <= the input size
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Reported by forum user turas35.

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

Adds per slave option 'onfail' to the tee muxer allowing an output to
fail, so other slave outputs can continue.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Jan Sebechlebsky <sebechlebskyjan@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

In open_slave failure can happen before bsfs array is initialized,
close_slave must check that bsfs is not NULL before accessing
tee_slave->bsfs[i] element.

Slave muxer expects write_trailer to be called if it's
write_header suceeded (so resources allocated in write_header
are freed). Therefore if failure happens after successfull
write_header call, we must ensure that write_trailer of
that particular slave is called.

Some cleanups are made by Marton Balint.
Reviewed-by: Nicolas George <george@nsup.org>
Signed-off-by: Jan Sebechlebsky <sebechlebskyjan@gmail.com>
Signed-off-by: Marton Balint <cus@passwd.hu>

* commit '704a3976':
  rtmpdh: add an stdio.h include
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>