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• ffmpeg unknown keyword invalid data found when processing input

  16 novembre 2020, par Adriaan

  I have a file ffmpeg_list_of_files.txt with the content

  



  file '.\Output_0\forces_vs_radii.pdf'
file '.\Output_1\forces_vs_radii.pdf'
file '.\Output_2\forces_vs_radii.pdf'
file '.\Output_3\forces_vs_radii.pdf'
file '.\Output_4\forces_vs_radii.pdf'
and so on...


  



  and then run ffmpeg -f concat -i ffmpeg_list_of_files.txt -c copy output.mkv as is stated at

  



  http://trac.ffmpeg.org/wiki/Concatenate

  



  I, unfortunately, get the error

  



  Line 1: unknown keyword ' ■f'
.\ffmpeg_list_of_files.txt: Invalid data found when processing input


  



  in Windows PowerShell in Windows 10.

  



  What am I doing wrong ?

  


• Unexpected pause in video after concatenating multiple mp4 files using ffmpeg

  21 janvier 2019, par Ajit Maurya

  I am trying to concatenate more than 90 small MP4 videos for a single MP4 file.
  i got code reference from here
  , i successfully got an output.mp4 file, but i tried to play video, there is a long pause between videos, searched and got this here is the link, but failed.

  CMD CODE : ffmpeg -y -f concat -i inputs.txt -c copy output.mp4
  inputs.txt is like
  file video_1.mp4
  
  duration 17
  
  file video_2.mp4
  
  duration 25
  
  file video_3.mp4
  
  duration 45
  
  file video_4.mp4
  
  duration 15
  
  file video_5.mp4
  
  duration 10
  
  file video_6.mp4
  
  duration 20
  
  file video_7.mp4
  
  duration 25
  
  file video_8.mp4
  
  duration 20
  
  file video_9.mp4
  
  duration 15
  
  file video_10.mp4
  
  duration 12
  

  Please help me.

• FFMPEG : Generate 7.1 channel audio file with the longest time of input file

  10 juin 2020, par Anthony

  I want to use ffmpeg to generate 7.1 channel audio file from 8 different audio files.
But I found the output file's duration is decided by the input file with shortest duration.
I didn't find any parameter to auto-pad the shorter audio file or choose the longest duration as final duration.

  



  I already have seen the offlical document as below.
https://ffmpeg.org/ffmpeg-all.html
https://trac.ffmpeg.org/wiki/AudioChannelManipulation
But nothing is helpful.

  



  This is the command I use right now :

  



  ffmpeg -i fl.wav -i fr.wav -i fc.wav -i lfe.wav -i bl.wav -i bl.wav -i sl.wav -i sr.wav -filter_complex "[0:a][1:a][2:a][3:a][4:a][5:a][6:a][7:a]join=inputs=8:channel_layout=7.1[a]" -map "[a]" output.wav