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• avformat/matroskaenc : Split updating CodecPrivate from writing it

  17 juin 2022, par Andreas Rheinhardt

  avformat/matroskaenc : Split updating CodecPrivate from writing it
  Up until now, updating extradata was very ad-hoc : The amount of
  
  space reserved for extradata was not recorded when writing the
  
  header ; instead the AAC code simply presumed that it was enough.
  
  This commit changes this by recording how much space is available.
  This brings with it that the code for writing of and reserving space
  
  for the CodecPrivate and for updating it diverges. They are therefore
  
  split ; this allows to put other common tasks like seeking to
  
  right offset as well as writing padding (in case the new extradata did
  
  not fill the whole reserved space) to this common function.
  The code for filling up the reserved space is smarter than the code
  
  it replaces ; therefore it is no longer necessary to reserve more
  
  than necessary just to be sure that one can add an EBML Void element
  
  (whose minimum size is two) lateron. This is the reason for the change
  
  to the aac-autobsf-adtstoasc test.
  Reviewed-by : Michael Niedermayer <michael@niedermayer.cc>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavformat/matroskaenc.c
  • [DH] tests/ref/fate/aac-autobsf-adtstoasc

• vaapi_h265 : Fix slice header writing

  30 septembre 2016, par Mark Thompson

  vaapi_h265 : Fix slice header writing
  This was not observed earlier because the only syntax element which
  
  it normally misses with the current setup is slice_qp_delta, but that
  
  is always going to be zero (in IDR frames QP isn’t varied on the
  
  slice) which will always exp-golomb code as a single 1 bit.  The
  
  immediately following part is the byte alignment, which is always a 1
  
  bit followed by 0s which are ignored, so as long as the bitstream is
  
  never aligned at that point we will never notice because the only
  
  difference is that an ignored bit is a 1 instead of a 0.
  (cherry picked from commit fc30a90898e419cee7c7cb496976da6337d0bf3e)
  

  • [DH] libavcodec/vaapi_encode_h265.c

• avformat/ivfenc : fix writing codec tag

  24 septembre 2018, par James Almer

  avformat/ivfenc : fix writing codec tag
  The value in AVCodecParameters->codec_tag may not be correct for IVF,
  
  as it's the case when remuxing AV1 streams from mp4, so ignore it and
  
  write the correct value based on codec ID instead.
  Reviewed-by : Jan Ekström <jeebjp@gmail.com>
  
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/ivfenc.c