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• opusdsp : adjust and optimize C function to match assembly

  15 août 2019, par Lynne

  opusdsp : adjust and optimize C function to match assembly
  The C and asm versions behaved differently _outside_ of the codec.
  The C version returned pre-multiplied 'state' for the next execution
  
  to use right away, while the assembly version outputted non-multiplied
  
  'state' for the next execution to multiply to save instructions.
  
  Since the initial state when initialized or seeking is always 0,
  
  and since C and asm versions were never mixed, there was no issue.
  However, comparing outputs directly in checkasm doesn't work without
  
  dividing the initial state by CELT_EMPH_COEFF and multiplying the
  
  returned state by CELT_EMPH_COEFF for the assembly function.
  Since its actually faster to do this in C as well, copy the behavior the
  
  asm versions use. As a reminder, the initial state 0 is divided by
  
  CELT_EMPH_COEFF on seek and init (just in case in the future this is
  
  changed, its technically more correct to init with CELT_EMPH_COEFF than 0,
  
  however when seeking this will result in more audiable pops, unlike with 0
  
  where the output gets in sync over a few samples).
  

  • [DH] libavcodec/opus_celt.c
  • [DH] libavcodec/opusdsp.c

• FFmpeg more than 1000 frames duplicated and input height doesn't match

  2 septembre 2021, par Karine

  I'm currently using this code to record two windows side by side :

  


  ffmpeg -f gdigrab -framerate 30 -i title="" -f gdigrab -framerate 30 -i title="" -c:v h264_nvenc -qp 0 -filter_complex hstack=inputs=2 2.mp4


  


  However it throw this error after execution :

  


  More than 1000 frames duplicated


  


  Error Log : https://pastebin.com/gREVrKVK

  


  The first window mostly time is the same frame, maybe 1 frame change in each 3 sec.

  


  Another error in console is when the first window have a different height than second window, error :

  


  [Parsed_hstack_0 @ 000002491166fd00] Input 1 height 500 does not match input 0 height 488.
[Parsed_hstack_0 @ 000002491166fd00] Failed to configure output pad on Parsed_hstack_0


  


  Error log : https://pastebin.com/vqdBPfpv

  


  Looks like is not possible to record when they have different dimensions, so, if possible I would like to ask how to scale the first window to the same height (doesn't need to keep aspect ratio) of the second window, considering low CPU use above the video quality.

  


• hap : Adjust printf length modifiers to match variable types

  8 décembre 2015, par Diego Biurrun

  hap : Adjust printf length modifiers to match variable types
  libavcodec/hapenc.c:121:20 : warning : format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘size_t aka unsigned int’ [-Wformat=]
  
  libavcodec/hapenc.c:121:20 : warning : format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 5 has type ‘size_t aka unsigned int’ [-Wformat=]
  

  • [DBH] libavcodec/hapenc.c