fix videotools (#4394) #421

Job	Run time
build phraseanet-db / build	35s
build phraseanet-elasticsearch / build	27s
build phraseanet-nginx / build	3m 52s
build phraseanet-fpm / build	3m 48s
build phraseanet-setup / build	3m 47s
build phraseanet-worker / build	1h 5m 32s
unit test	12m 46s
	1h 30m 47s

Provide feedback