Store the output of ffprobe into a string

codingcultivator445

11/9/23, 4:09 AM

I know that normally you can do something like var=echo "hello world" | grep hello and var will be equal to "hello world" However when I'm trying to do "var=ffprobe file.mp3 | grep artist" to store the song's artist into var as a string, it doesn't work. Any thoughts?

513

1 + 2

bash

Cagri

11/9/23, 5:25 AM

you're doing `var=$(command)` right? if so, iirc ffprobe outputs in stderr so you have to add `2>&1` at the end of ffprobe command

Barmar

11/9/23, 3:45 PM

`var=echo "hello world" | grep hello` doesn't set `var` to the output of the command. It sets `var` to the word `echo`, then tries to execute `"hello world"` as a command. You're missing the `$()` or backticks around the command whose output should be substituted.

Score:3

Ubuntu

rɑːdʒɑ

11/9/23, 5:45 AM

Seems ffprobe, writing to stderr(comment has this mentioned already) But if you want only artist, you have to use 'w' flag as well.

> $ ffprobe "Adigo Alladigo.mp3" 2>&1 | grep artist
    artist          : SP.Balu
    album_artist    :

> $ ffprobe "Adigo Alladigo - SenSongsMp3.Co.mp3" 2>&1 | grep -w artist
    artist          : SP.Balu

Hope it helps.

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