Issue Using FFMpeg library in Addon

[XenCircle]

By using FFMpeg library i cutt the video of attachment by upload in thread. when i use the FFMpeg library in sandbox its work fine. when i use the library in addon install by composer its create issue.

Any one know about it.

Screenshot attached

Error: Call to undefined method Symfony\Component\Process\Process::setCommandLine() in src/vendor/symfony/process/ProcessBuilder.php at line 269



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