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• ffmpeg filter_complex doesn't work with text file input

  5 avril 2023, par Martin

  I have a working ffmpeg command that takes 4 input files
https://file.io/DllNlkCqX6J6

  


  (2 audio, 2 images) and then renders a .mkv video, using a filter_complex string which tells ffmpeg to concat the two audio files and make a slideshow for the two images.

  


  The filter_complex string relies on the order of the input files.

  


  For example : [0:a][1:a]concat=n=2:v=0:a=1[a] in filter_complex tells ffmpeg to take the index=0 input audio file, and the index=1 input audio file, and concat them.

  


  Then, the the [2:v] part tells ffmpeg to take the index=2 image file (we start counting index at zero, so index=2 is really the 3rd file, which is '3.sidea.jpg')

  


  ffmpeg 

-r 2 -i "C:\Users\martin\Documents\album\a1 - in the beginning.mp3" 
-r 2 -i "C:\Users\martin\Documents\album\a2 - stratovarious.mp3" 
-r 2 -i "C:\Users\martin\Documents\album\3 sidea.jpg" 
-r 2 -i "C:\Users\martin\Documents\album\4 sideb.jpg" 

-filter_complex "[0:a][1:a]concat=n=2:v=0:a=1[a];[2:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v2];[3:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v3];[v2][v3]concat=n=2:v=1:a=0,pad=ceil(iw/2)*2:ceil(ih/2)*2[v]" 

-map [v] -map [a] -c:a pcm_s32le -c:v libx264 -bufsize 3M -crf 18 -pix_fmt yuv420p -tune stillimage -t 309.95 
"C:\Users\martin\Documents\album\working.mkv"


  


  This command works, but I use the same format for, say, 2k+ audio input files, I reach the terminal command line char limit. So I am trying to move my input files to a text file input_files.txt :

  


  file 'C:\Users\martin\Documents\album\a1 - in the beginning.mp3'
file 'C:\Users\martin\Documents\album\a2 - stratovarious.mp3'
file 'C:\Users\martin\Documents\album\3 sidea.jpg'
file 'C:\Users\martin\Documents\album\4 sideb.jpg'



  


  The same files, in the same order. But running my new command with this input_text.txt file :

  


  ffmpeg 

-f concat -safe 0 -i input_files.txt

-filter_complex "[0:a][1:a]concat=n=2:v=0:a=1[a];[2:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v2];[3:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v3];[v2][v3]concat=n=2:v=1:a=0,pad=ceil(iw/2)*2:ceil(ih/2)*2[v]" 

-map [v] -map [a] -c:a pcm_s32le -c:v libx264 -bufsize 3M -crf 18 -pix_fmt yuv420p -tune stillimage -t 309.95 
"C:\Users\martin\Documents\album\working.mkv"


  


  Results in an error about the filter_complex index numbers :

  


  [mp3 @ 0000025d87057700] Estimating duration from bitrate, this may be inaccurate
Input #0, concat, from 'input_files.txt':
  Duration: N/A, start: 0.000000, bitrate: 320 kb/s
  Stream #0:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s
Invalid file index 1 in filtergraph description [0:a][1:a]concat=n=2:v=0:a=1[a];[2:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v2];[3:v]scale=w=1920:h=1920:force_original_aspect_ratio=decrease,pad=1920:1920:-1:-1:color=white,setsar=1,loop=309.95:309.95[v3];[v2][v3]concat=n=2:v=1:a=0,pad=ceil(iw/2)*2:ceil(ih/2)*2[v].



  


  Almost like it's treating the -i input_files.txt as its own index=0 file. I've tried different fixes but no luck.

  


  How can I use my filter_complex string with a text file as the source of my ffmpeg command file inputs ?

  


• Ogg file is not detected as audio mime in mediawiki (Ogg generated by ffmpeg)

  12 janvier 2015, par JoeyD

  I have an ogg file that I converted with ffmpeg from a 3gp file. The audio file is supposed to go into Mediawiki for other users to listen to. However uploading the file always gives it the mime-type application/ogg and no player is shown for that file.

  Are there specific settings that I have to follow to have it detect as audio in Mediawiki ? Or should i look to ffmpeg ? I use the -codec:a libvorbis flag for ffmpeg

• How do I split a M4B file provided I have a CUE file ?

  4 mars 2023, par user6779573

  I have a large M4B file and a CUE file for it. I want to either split it into many M4B files, or split it into many MP3 files (former preferred).

  



  I want to do this in the command line (OS X, but can use Linux if needed) and not install sketchy software. I have ffmpeg and can install other command line audio programs.