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• ffmpeg : take bsf arguments from the command line

  29 novembre 2014, par Christophe Gisquet

  ffmpeg : take bsf arguments from the command line
  The format is now :
  
   bsf:X filter1[=opt1=str1/opt2=str2],filter2
  
  ie the parameters are appended after the filter name using ’=’. As ’,’
  
  has been reserved already for the list of filters, ’/’ is just an
  
  example of token separation for now, but that could become part of the
  
  API to avoid each bsf using its own tokenization.
  The proper solution would be using AVOption, but this is overkill for now.
  Signed-off-by : Michael Niedermayer <michaelni@gmx.at>
  

  • [DH] doc/bitstream_filters.texi
  • [DH] ffmpeg.c
  • [DH] ffmpeg.h
  • [DH] ffmpeg_opt.c

• How to merge videos (without audio) and add audio to them after merging in single line command ? [on hold]

  25 juillet 2019, par Kartik Chhajed

  I want to merge three videos and then after I want to replace/rewrite the audio streams. Basically, there are 4 files, three are .mp4 and one mp3.

  I have done this explicitly with two-line code and it’s working.

  The two line code :

  ffmpeg -i 20190722_115754.mp4 -i 20190722_114403.mp4 -i 20190722_110008.mp4 -filter_complex "[0:v:0] [1:v:0] [2:v:0] concat=n=3:v=1 [v]" -map "[v]" output_video_1.mp4
  
  ffmpeg -i output_video_1.mp4 -i audio.mp3 -c copy -map 0:v:0 -map 1:a:0 -shortest output_video_2.mp4

  But I want one-liner,
  The one-liner which I have tried are :

  ffmpeg -i 20190722_115754.mp4 -i 20190722_114403.mp4 -i 20190722_110008.mp4 -filter_complex "[0:v:0] [1:v:0] [2:v:0] concat=n=3:v=1 [v]" -i audio.mp3 -c copy -map "[v]" -map 3:a:0 -shortest output_video_3.mp4

  And

  ffmpeg -i 20190722_115754.mp4 -i 20190722_114403.mp4 -i 20190722_110008.mp4 -i audio.mp3 -filter_complex "[3:a:0] [0:v:0] [1:v:0] [2:v:0] concat=n=3:v=1 [v] [a]" -map "[v]" -map "[a]" output_video_3.mp4

  But, this will not work.

  I want to reduce to one line code.

• Python using windows command line [duplicate]

  1er octobre 2017, par Akos. prestigio

  This question already has an answer here :

  • os.system doesn’t work in Python
    
    2 answers
    
  • Why does not os.system(“cd mydir”) work and we have to use os.chdir(“mydir”) instead in python ?
    
    3 answers
    
  • Python os.system() call runs in incorrect directory
    
    2 answers
    
  • Command line execution in different folder
    
    2 answers
    

  I have this python code :

          import os
  
          os.system('cd C:\yt')
  
          os.system("ffmpeg.exe -i test.mp4 newfilename.mp3")

  The yt folder include the ffmeg.exe and test.mp4 but I write the code apart on cmd everthing is working but thus I get this error message :

         'ffmpeg.exe' is not recognized as an internal or external command,
  
         operable program or batch file.

  if I use C :\yt\ffmpeg.exe -i test.mp4 newfilename.mp3 is not working and if i use only os.system(’cd C :\yt’) i not get error message.
  What’s wrong with my code ?