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• R "only" substitute of the av package to split and convert an mp4 into multiple mp3 [closed]

  9 février 2024, par Bakaburg

  I am developing an R package that requires splitting an mp4 file into multiple segments and converting these segments into mp3 format. Currently, I use the av package for this task. However, av depends on the external ffmpeg tool, necessitating separate installation. This dependency complicates the setup for non-expert users of my package.

  


  I am seeking an alternative approach that either uses only R or incorporates a low-level solution directly within the package, eliminating the need for external tool installations. The goal is to streamline the user experience by minimizing setup complexity.

  


  Does anyone know of such a solution or approach that can substitute the functionality provided by av without external dependencies ?

  


• avformat/wavenc : Fix leak and segfault on reallocation error

  22 février 2021, par Andreas Rheinhardt

  avformat/wavenc : Fix leak and segfault on reallocation error
  Up until now, the wav muxer used a reallocation of the form ptr =
  
  av_realloc(ptr, size) ; that leaks upon error. Furthermore, if a
  
  failed reallocation happened when writing the trailer, a segfault
  
  would occur due to avio_write(NULL, size) because the muxer only
  
  prints an error message upon allocation error, but does not return
  
  the error.
  Moreover setting the pointer to the buffer to NULL on error seems to
  
  be done on purpose in order to record that an error has occured so that
  
  outputting the peak values is no longer attempted. This behaviour has
  
  been retained by simply disabling whether peak data should be written
  
  if an error occurs.
  Finally, the reallocation is now done once per peak block and not once
  
  per peak block per channel ; it is also done with av_fast_realloc and not
  
  with a linear size increase.
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
  

  • [DH] libavformat/wavenc.c

• avformat : call AVOutputFormat->deinit() when freeing the context

  19 octobre 2019, par James Almer

  avformat : call AVOutputFormat->deinit() when freeing the context
  Despite the doxy stating that it's called when the muxer is destroyed,
  
  this was not true in practice. It's only called by av_write_trailer()
  
  and on init() failure.
  An AVFormatContext may be closed without writing the trailer if errors
  
  ocurred while muxing packets, so in order to prevent memory leaks, it
  
  should effectively be called when freeing the muxer.
  Signed-off-by : James Almer <jamrial@gmail.com>
  

  • [DH] libavformat/mux.c
  • [DH] libavformat/utils.c