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• Recommendations about FFmpeg filters to enhance video quality or fixes

  2 juin 2021, par Mapg

  I am developing a web application using FFmpeg, and I would like to know your recommendations about what filters (to be implemented as presets) my users could use to enhance the video image quality and fix the common video problems.

  


  I have in mind for example to use the "Automatic Levels" filter (using "pp=al"), "Audio Level Normalization", some "Denoise" filter, and "Deinterlacing" filter.

  


  But as you can see I only have in mind 4 filters while FFmpeg has a lot of them.

  


  What filters could I add to a Set of Presets for my users ? Something useful. Like a Set of Swiss Army Knife tools.

  


  I am looking forward to hearing your recommendations.

  


  Any other tool or fix is good too, even using other software in the shell. No problem.

  


  Thank you very much in advance !!

  


  Mapg

  


• avcodec/av1 : Add upper bound for the size of a sane sequence header

  16 juin 2022, par Andreas Rheinhardt

  avcodec/av1 : Add upper bound for the size of a sane sequence header
  It will be used by the Matroska muxer to reserve a certain number
  
  of bytes for the CodecPrivate in case no extradata is initially
  
  available (as it is for the libaom-av1 encoder).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/av1.h

• 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