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• Applying same filter_complex many times before output [duplicate]

  19 août 2019, par Fabián

  This question already has an answer here :

  • FFmpeg command to apply multiple filters and limit the final file size [closed]
    
    1 answer
    
  • Applying multiple filters at once with FFMPEG
    
    2 answers
    
  • FFMpeg - Combine multiple filter_complex and overlay functions
    
    1 answer
    
  • ffmpeg : multiple video filter order issue
    
    1 answer
    

  It’s not a duplicate. This is about using filter_complex, not -vf.

  In my video there’s an object that has shades of yellow (more orange-like) and a solid yellow as background.

  I need to output all frames into a png sequence, using a color key filter to replace the yellow from the background :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.125:0[ckout]" -map "[ckout]" colorkey-%d.png

  This removes the specific color, but leaves some pints behind, and some items are yellow-themed, so blending value is a no-no for this scenario.

  I need to get rid of 4 specific yellow-colors from the frames : 0xfff31b, 0xfae56b, 0xfaec46 and 0xeee2a0, and I plan to run the same filter for specific colors before getting the final result.

  So first I tried this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout1];[0:v]colorkey=0xfae56b:0.4:0[ckout2];[0:v]colorkey=0xfaec46:0.4:0[ckout3];[0:v]colorkey=0xeee2a0:0.4:0[ckout4]" -map "[ckout4]" colorkeyrefined-%d.png

  Then this :

  ffmpeg -ss 4 -i original.mp4 -t 2 -filter_complex "[0:v]colorkey=0xfff31b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfae56b:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xfaec46:0.4:0[ckout]" -filter_complex "[0:v]colorkey=0xeee2a0:0.4:0[ckout]" -map "[ckout]" colorkeyrefined-%d.png

  But both display the same error :

  Filter colorkey has an unconnected output.

  Is there a way to apply the colorkey feature 4 times (with the mentioned values) in one go ?

• Bat file that extracts subtitle file then hard encodes the subtitle file into the original mkv file

  1er septembre 2019, par NolanWinsman

  My tv can play mkv files off of a flash drive but it cannot detect the subtitles files. I am trying to make a bat file that essentially takes the .srt file out of the mkv file then hard encodes it into the mkv file using ffmpeg. I am getting close but the naming is not working properly. For instance when it creates the subtitle file it names it infile.mkv.srt. When the file is encoded it is named infile.mkvEncoded.mkv. I am trying to get rid of the extra .mkv

  I am not great with variables in bat files so I am not exactly sure what to do. I added the "Encoded" part to the name of the file so that it doesn’t overwrite the original infile. I plan on just using bulk rename utility to get rid of that part unless there is a better way.

  My code is :

      DO (
  
      MKDIR Encoded_Files
  
      )
  
      FOR /F "tokens=*" %%G IN ('dir /b *.mkv') DO (
  
          ffmpeg -i "%%G" -vn -an -codec:s:0.1 srt "%%G.srt"
  
          ffmpeg -i "%%G" -vf "subtitles=%%G.srt" "%%GConverted"
  
          move *"%%~nG" "Encoded_Files"
  
              )

  The expected result would be infileEncoded.mkv*

• avutil/avstring : support input path as a null pointer or empty string

  24 septembre 2019, par Limin Wang

  avutil/avstring : support input path as a null pointer or empty string
  Linux and OSX systems support basename and dirname via <libgen.h>, I plan to
  
  make the wrapper interface conform to the standard interface first.
  
  If it is feasible, I will continue to modify it to call the system interface
  
  if there is already a system call interface.
  You can get more description about the system interface by below command :
  
   "man 3 basename"
  Reviewed-by : Marton Balint <cus@passwd.hu>
  
  Reviewed-by : Tomas Härdin <tjoppen@acc.umu.se>
  
  Reviewed-by : Steven Liu <lq@chinaffmpeg.org>
  
  Signed-off-by : Limin Wang <lance.lmwang@gmail.com>
  

  • [DH] libavutil/avstring.c
  • [DH] libavutil/avstring.h