Why does this bash script require me to press enter to continue?

Question

Hello all,

I was kindly helped a few minutes ago by a user named Juliano and the script works fine but it just baffles me why it continues to work when I press enter, if I don't it just sits there untill I have to keep pressing enter. I thought that was the job of the for loop?

    #!/bin/bash
    TIMEFORMAT=%6R
    for file in /home/test/videos/* ; do
     #for loop 2
     for (( i = 0; i < 10; i++ )); do
      #for loop 3
      for ext in avi mpg wmv mov; do
          base="${file##*/}"
          elapsed=$({ time ffmpeg -i "$file" -ar 44100 "${file%/*}/done/${base%.*}.$ext" &>/dev/null; } 2>&1)
          echo "$file $i $ext took $elapsed seconds"
        done
      done
    done

Also can I swap for loops 2 and 3?

Thanks all

Update

How can I also make use of the variable "i" in the for loop so that it concatinates at the end of the file. Is this correct:

${file%/}/done/${base%.}$i.$ext

Thank you for anymore help.

Answer 1

I suspect that the ffmpeg program is what's waiting for the keypress at the end of the process. You might be able to send it a keypress, like:

echo -e \\n | time ffmpeg ...

which might echo a new line "into" the standard input of the ffmpeg program.

And yes, you can swap loop #2 and #3.

Answer 2

I already answered in the other question. It was ffmpeg asking you to overwrite the output file. Giving unique names (with $i in the filename) and passing -y to ffmpeg solves the problem.