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• avformat/matroskadec : Accept more unknown-length elements

  17 mai 2019, par Andreas Rheinhardt

  avformat/matroskadec : Accept more unknown-length elements
  The current Matroska specifications mandate that only two elements may
  
  use an unknown-length length : Segments and clusters. But this was not
  
  always so : For the greater part of Matroska's existence, all master
  
  elements were allowed to make use of the unknown-length feature.
  And there were muxers creating such files : For several years
  
  libavformat's Matroska muxer used unknown-length for all master
  
  elements when the output wasn't seekable. This only stopped in March
  
  2010 with 2529bb30. And even afterwards it was possible (albeit
  
  unlikely) for libavformat to create unknown-length master elements
  
  that are in violation of today's specifications, namely if the master
  
  element was so big that the seek backwards to update the size could
  
  no longer be performed inside the AVIOContext's write buffer. This
  
  has only been fixed in October 2016 (with the patches that introduced
  
  support for writing CRC-32 elements).
  Libavformat's Matroska demuxer meanwhile has never really supported
  
  unknown-length elements besides segments and clusters. Support for the
  
  latter was hardcoded. This commit changes this : Now all master elements
  
  for which a syntax to parse them is available are supported. This
  
  includes the files produced by old versions of libavformat's muxer.
  More precisely, master elements that have unknown length and are about
  
  to be parsed (not skipped) are supported ; only a warning is emitted for
  
  them. For normal files, this means that level 1 elements after the
  
  clusters that are encountered after the clusters have been parsed (i.e.
  
  not because they are referenced by the seekhead at the beginning of the
  
  file) are still unsupported (they would be skipped at this point if
  
  their length were known).
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/matroskadec.c

• lavc/mjpegdec : Skip unknown APPx marker on bayer images

  29 août 2019, par Nick Renieris

  lavc/mjpegdec : Skip unknown APPx marker on bayer images
  Samples :
  
   Embedded JPEG images in the DNG images here :
  
    https://www.photographyblog.com/previews/pentax_k1_photos
  Signed-off-by : Nick Renieris <velocityra@gmail.com>
  

  • [DH] libavcodec/mjpegdec.c

• Unknown Decoder in ffmpeg

  17 mars 2020, par user6782547

  I have a script, that is called from Plex after the recording of a movie. This script just crops the black borders of the movie.

  When I call it directly from the command line, it works flawlessly. But when Plex calls it, it says : "Unknown decoder", even if I call it with the key word "auto" for the decoder.

  There’s another problem, that might give a hint to solve my problem. It also says : "WARNING: library configuration mismatch". (Only when being called from Plex.) This is probably, because I compile ffmpeg from the Debian source package (so that I can add the whole CUDA functionality).
  I had a look at the dynamic linker path, but it is empty on the command line.

  What is so different, when this command is called from Plex, than when I call it manually from the command line ?

  Thanks for any help