Publikacje

Abstract:

WebRTC uses two simulcast schemes: the older, based on the replication of streams encoded to different qualities of the original signal (typically: video), and the newer, fully introduced this year to one of the more popular browsers, based on layered encoding. While the first solution has a well-established position in the WebRTC technology, the layered simulcast still remains in an early stage of development. The goal of this paper was to compare behavior of the two WebRTC simulcast schemes in terms of the key feature of the simulcast, i.e. its adaptability to network conditions. To achieve this goal, we wrote the WebRTC application (a simple videomonitoring software) that act as simulcast sender. The adaptability of the simulcast schemes was investigated for the case of video traffic transmitted in a heterogeneous test network (wired and wireless). As adaptability indicators, such as the throughput and packet error rate were used. Results of the simulcasting of 4K video show that in the case of infrastructural limitations only there are no significant differences between the adaptability of the stream replication simulcast and the layered simulcast. Adaptability for dynamic limitations (introduced by background traffic) was better in the case of the layered simulcast.

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Comparison study of the adaptability of layered and stream replication variants of the WebRTC simulcast