Modern-age technology enables us to consume multimedia
for enjoyment and as a social experience. The traditional
way to consume multimedia together (e.g., with family or friends
in the living room) is being superseded by a location-independent
scenario where geographically distributed users consume the
same content while having a real-time communication channel
among each other. Inter-Destination Multimedia Synchronization
(IDMS) is the tool of choice in order to enable users a high-quality
multimedia experience. In this paper, we investigate the influence
of asynchronism when consuming multimedia content together
while being geographically distributed. In particular, we adopt
the concept of human computation and developed a reaction game
which we used to conduct a crowdsourced subjective quality
assessment in order to evaluate a threshold for multimedia
synchronization within an IDMS scenario. Our results show a
significant decrease in overall Quality of Experience (QOE) at
an asynchronism level of 750ms. At the same time, we were able
to show that asynchronism at a level of 400ms does not have
significant differences regarding the QoE when compared to the
synchronous reference case