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I'd like to create a small shell script that will tell me the duration of a video whose file name is passed to it as a parameter. It'd be something like this:

$ script_name "file name with spaces.webm" # or any other media file extension

The script file would resemble

#/bin/bash
SECRET_SAUCE_USING_$1 | mediainfo | grep Duration | sort -u
# maybe SECRET_SAUCE_USING_$1 | xargs -0 mediainfo . . .

On the command line, this is what works and what I want the script to do:

$ mediainfo file\ name\ with\ spaces.webm | grep Duration | sort -u

I've tried using things like

echo "$1" | sed 's/ /\\ /g' # piped to mediainfo . . .

to change the spaces in the file name to '\ ' character pairs (without the quotes). The echo ... | sed ... part works but mediainfo barfs

and

echo "$1" | tr ' ' '\000' | xargs -0 mediainfo . . .

to change the spaces to nulls and get xargs to invoke mediainfo with nulls in the file name instead of spaces.

I haven't found a solution so far. (I actually use zsh, not bash.) All help greatly appreciated. Tnx.

  • mediainfo '--Inform=Video;%Duration/String4%\n' "$1" – Alex Nov 27 '18 at 10:38
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If you want the script's parameter ($1) to end up as mediainfo's parameter, then just put it there:

# ...
mediainfo "$1" | grep Duration | sort -u
# ...

That works for a single parameter to the script. More flexibly, you could loop over all of the script's parameters and feed them one at a time to mediainfo:

for file in "$@"
do
  mediainfo "$file" # ...
done
  • Thanks for your answer. That was the very first thing I tried and it didn't work when I originally tried it. Now it does. I must have been doing something wrong before. How do I mark this question as solved? – Don Nadie Jan 30 '18 at 12:44
  • Happy to hear! Looks like you found the check mark, so you’re all set! – Jeff Schaller Jan 30 '18 at 13:06

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