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• Using ffmpeg in bash

  20 août 2013, par Benjamin King

  I'm trying to make a bash script to transcode .wav files to mp3 (with lame V0 preset) within a directory. Here's what I have so far

  #!/bin/bash
  
  #
  
  for abc in *.wav; do
  
    name=${abc%.*}
  
    echo "$name"
  
    ffmpeg -i "$abc" -ac 2 -f wav - | lame -V 0 - "$name.mp3"
  
  done
  
  #

  Where the first do line cuts out the extension so I can use the file name later.

  I've tested the ffmpeg command on a single file but once I include it in the for loop I get the following error (for the last track) :

  10 Artist - track
  
  lame: excess arg Artist
  
  ffmpeg version 0.8.6-4:0.8.6-0ubuntu0.12.04.1, Copyright (c) 2000-2013 the Libav developers
  
    built on Apr  2 2013 17:00:59 with gcc 4.6.3
  
  10: No such file or directory

  I'm not sure why there is an excess argument for the lame line, or why ffmpeg is looking only at a file named "10". Is there something I'm missing ?

  Many thanks for any help

• bash while loop and ffmpeg

  17 juin 2013, par Larry_b

  Sorry for this questions I imagine the answer is pretty straightforward however I have had a search and I haven't found anything that answers it.

  I have written the following :

  while read p                        # reads in each line of the text
  
  do                                  # file- folder_list.txt each iteration.
  
      echo "$p"                       # print out current line
  
      if [ -f  $p/frame_number1.jpg ] # checks if the image exists in the specific folder
  
      then
  
          echo "$p"                   #prints specific folder name
  
          sleep 1                     #pause for 1 second
  
          ffmpeg -f image2 -r 10 -i $p/frame_number%01d.jpg -r 30 $p/out.mp4  #create video
  
       fi                             # end if statement
  
  done code>

  The script is supposed to read a text file which contains the folder tree structure, then check if the folder contains the specified JPEG if it does then the code should create a video from the images contained within the specified folder.

  However what appears to be happening is the script skips whole folders that definitely contain images. I was wondering if the while loop is continuing to iterate whilst the video is being created or if something else is happening ?

  Any help would be greatly appreciated.

  Many thanks in advance

  Laurence

• First character disappears when piping script with ffmpeg to bash

  3 octobre 2017, par kubi

  I often create bash scripts with bash and pipe the results to bash... When I do this :

  echo -e "ffmpeg -loglevel quiet -f lavfi -i nullsrc -t 1 -f null /dev/null\necho foo"|bash

  I get

  bash: line 2: cho: command not found

  Where did the ’e’ of ’echo’ go ? What does ffmpeg do there ? Other commands work fine.

  Note also :

  echo -e "ffmpeg -loglevel quiet -f lavfi -i nullsrc -t 1 -f null /dev/null\necho foo" > /tmp/foo.sh
  
  bash /tmp/foo.sh #works
  
  bash < /tmp/foo.sh #doesn't