When i install ffmpeg-php on a plesk server, i got following error

PHP Warning:  PHP Startup: Unable to load dynamic library '/usr/lib/php/modules/ffmpeg.so' - /usr/lib/php/modules/ffmpeg.so: undefined symbol: php_gd_gdImageSetPixel in Unknown on line 0

This is caused by loading ffmpeg.so before gd.so

To fix the error, i edited

vi /etc/php.d/gd.ini

added following as last line

extension=ffmpeg.so