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• avcodec/cfhddata : Reduce stack usage

  3 septembre 2022, par Andreas Rheinhardt

  avcodec/cfhddata : Reduce stack usage
  Creating CFHD RL VLC tables works by first extending
  
  the codes by the sign, followed by creating a VLC,
  
  followed by deriving the RL VLC from this VLC (which
  
  is then discarded). Extending the codes uses stack arrays.
  The tables used to initialize the VLC are already sorted
  
  from left-to-right in the tree. This means that the
  
  corresponding VLC entries are generally also ascending,
  
  but not always : Entries from subtables always follow
  
  the corresponding main table although it is possible
  
  for the right-most node to fit into the main table.
  This suggests that one can try to use the final destination
  
  buffer as scratch buffer for the tables with sign included.
  
  Unfortunately it works for neither of the tables if one
  
  uses the right-most part of the RL VLC buffer as scratch buffer ;
  
  using the left-most part of the RL VLC buffer as scratch buffer
  
  might work if one traverses the VLC entries from end to start.
  
  But it works only for the little RL VLC (table 9), not for table 18.
  Therefore this patch uses the RL VLC buffer for table 9
  
  as scratch buffer for creating the bigger table 18.
  
  Afterwards the left part of the buffer for table 9 is
  
  used as scratch buffer to create table 9.
  This fixes the cfhd part of ticket #9399 (if it is not already fixed).
  
  Notice that I do not consider the previous stack usage excessive.
  Reviewed-by : Paul B Mahol <onemda@gmail.com>
  
  Signed-off-by : Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
  

  • [DH] libavcodec/cfhddata.c

• ffmpeg expert to help me with an encoding problem [closed]

  22 août 2022, par Michael Heuberger

  I'm the developer of www.videomail.io and experience issues with audio. It's a heavily used, free service to enable Deaf people to email in Sign Language. Runs on ffmpeg (under node-fluent-ffmpeg) and JavaScript (Node.js).

  


  Since I am Deaf myself, I am unable to repair some audio-related issues while muxing video with audio together on server side via ffmpeg. Reason for adding audio is to expand the target audience.

  


  That said, I'm searching for someone to help me with this. It's a paid job !

  


  Requirements :

  


  

  • Must know ffmpeg very well, especially on how to encode audio (WAV) and video (MP4) together without any audio delays.

  


  • Knowing JavaScript would be a massive plus for writing code

  


  • Has time in the following weeks, I guess about 10 hours or so.

  


  


  If you are keen, ping me please. My page is www.binarykitchen.com - thanks !

  


• Wanted : ffmpeg expert to help me with an encoding problem (paid job)

  22 août 2022, par Michael Heuberger

  Good day,

  


  I'm the developer of www.videomail.io and experience issues with audio. It's a heavily used, free service to enable Deaf people to email in Sign Language. Runs on ffmpeg (under node-fluent-ffmpeg) and JavaScript (Node.js).

  


  Since I am Deaf myself, I am unable to repair some audio-related issues while muxing video with audio together on server side via ffmpeg. Reason for adding audio is to expand the target audience.

  


  That said, I'm searching for someone to help me with this. It's a paid job !

  


  Requirements :

  


  

  • Must know ffmpeg very well, especially on how to encode audio (WAV) and video (MP4) together without any audio delays.

  


  • Knowing JavaScript would be a massive plus for writing code

  


  • Has time in the following weeks, I guess about 10 hours or so.

  


  


  If you are keen, ping me please. My page is www.binarykitchen.com - thanks !