ERROR: pipeline could not be constructed

[mohammadreza]

Hi 
I'm trying to do some playback pipe by :

gst-launch filesrc=/home/reza/Documents/trouble.mp3 ! mad ! autoaudiosink

but :
ERROR: pipeline could not be constructed: Unrecoverable syntax error while
parsing pipeline filesrc=/home/reza/Documents/trouble.mp3 ! mad !
autoaudiosink .

Any suggestion to solve the problem?



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