The talk of @aleks at #FOSDEM about #Yunohost has problem with audio and video on some device. I replace it by a new encoded video which works normally. Ping me if not.
New link : https://cinema.yunohost.support/videos/watch/1eb49594-0283-4a01-8691-3817a3cb31e6
(Thanks to @ButterflyOfFire and @aleks for the report and the precious help)