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• libswscale/x86/yuv2rgb : Change inline assembly into nasm code

  19 janvier 2020, par Ting Fu

  libswscale/x86/yuv2rgb : Change inline assembly into nasm code
  The original inline assembly and nasm code have the same fps when called by command.
  
  NASM code almost has no impact on the perfromance.
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  
  Signed-off-by : Michael Niedermayer <michael@niedermayer.cc>
  

  • [DH] libswscale/x86/Makefile
  • [DH] libswscale/x86/swscale.c
  • [DH] libswscale/x86/yuv2rgb.c
  • [DH] libswscale/x86/yuv2rgb_template.c
  • [DH] libswscale/x86/yuv_2_rgb.asm

• Set a subtitle language using ffmpeg

  22 avril 2022, par Sam

  I tried googling a way to set the language of a subtitle stream with ffmpeg and found the -slang option. So I tried the following command but immediately receive an error :

  



  ffmpeg -i input.avi -i subs.srt -c:a copy -c:s mov_text -slang eng -c:v libx264 -profile:v high -level:v 4.0 output.mp4
ffmpeg version 1.1 Copyright (c) 2000-2013 the FFmpeg developers
built on Jul 18 2013 23:00:53 with Apple clang version 4.0 (tags/Apple/clang-421.0.60) (based on LLVM 3.1svn)


  



  


  libavutil 52. 13.100 / 52. 13.100

  
 


  libavcodec 54. 86.100 / 54. 86.100

  
 


  libavformat 54. 59.106 / 54. 59.106

  
 


  libavdevice 54. 3.102 / 54. 3.102

  
 


  libavfilter 3. 32.100 / 3. 32.100

  
 


  libswscale 2. 1.103 / 2. 1.103

  
 


  libswresample 0. 17.102 / 0. 17.102

  
 


  libpostproc 52. 2.100 / 52. 2.100

  
 


  Unrecognized option 'slang'.

  
 


  Error splitting the argument list : Option not found

  


  



  After more googling I found another way to do it using the -metadata command :

  



  ffmpeg -i input.mp4 -i subs.srt -c:a copy -c:v copy -c:s mov_text -metadata:s:s:0 language=eng output.mp4


  



  And that works absolutely fine. But this isn't mentioned in the ffmpeg man page, whereas -slang is, which makes me think the -metadata command is maybe outdated or in some other way not as good as -slang.

  



  

  1. What is the difference between using the two above methods (-slang vs -metadata) ?

  


  2. Why did my -slang command give an error ? Have I used it incorrectly ?

  


  


• avfilter/x86/vf_eq : Change inline assembly into nasm code

  18 septembre 2019, par Ting Fu

  avfilter/x86/vf_eq : Change inline assembly into nasm code
  Signed-off-by : Ting Fu <ting.fu@intel.com>
  

  • [DH] libavfilter/x86/Makefile
  • [DH] libavfilter/x86/vf_eq.asm
  • [DH] libavfilter/x86/vf_eq.c
  • [DH] libavfilter/x86/vf_eq_init.c