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Editorial Team
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Asked: 2026-05-27T19:40:25+00:00

I want to add a variable ${date} in the following bash script: ffmpeg -i

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I want to add a variable ${date} in the following bash script:

ffmpeg -i in.flv -vf drawtext="fontfile=Sans.ttf:text='Today is ${date}':fontsize=6" out.flv

Obviously, ${date} won’t expand in single quote, please also note that there is a double quote beyond the single quote, which makes it even more complicated.

Thanks a lot. I am on CentOS 6.

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1 Answer

  1. Editorial Team

    ${date} is expanded because it is between double quotes (the single quotes inside the double quotes are just characters)

    Test it with:

    $ export date=SOMEVALUE
$ echo ffmpeg -i in.flv -vf drawtext="fontfile=/usr/share/fonts/dejavu/DejaVuLGCSans.ttf:text='Today is ${date}':fontsize=6" out.flv
ffmpeg -i in.flv -vf drawtext=fontfile=/usr/share/fonts/dejavu/DejaVuLGCSans.ttf:text='Today is SOMEVALUE':fontsize=6 out.flv
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