Low-Latency Broadcasting of Live Video Using Wi-Fi

Project Members

Stefan Mangold (Disney Research Zurich)
Vladimir Vukadinovic (Disney Research Zurich)
Stefan Schmid (Disney Research Zurich)
Fabio Zund (Disney Research Zurich)

 

PROJECT_BroadcastUsingWiFi_teaser

Crew members follow camera views during movie shooting via Wi-Fi live broadcasting from the cameras to their iPads.

The project addresses the problem of near real-time delivery of high-quality live video streams to multiple users via Wi-Fi. The users may be equipped with off-shelf portable devices such as tablets. Multiple streams are transmitted from one or multiple Wi-Fi access points (e.g. Wi-Fi enabled cameras) simultaneously. Each user may chose to view one stream in full resolution or multiple streams in reduced resolution. The number of users may be such that unicasting the streams to each of them exceeds the available network capacity. Therefore, the streams must be delivered via broadcast transmissions. Broadcasts in Wi-Fi are not acknowledged by the receivers and, therefore, retransmissions are disabled, which significantly increases the packet loss rate (PLR). While various retransmission schemes for broadcasting can be envisioned (e.g. driven by the user with the highest PLR) they would increase the transmission latency. Therefore, solutions based on FEC are preferred since they introduce minimum latency. Lower PHY modes (e.g. up to 6 Mb/s) provide stronger FEC protection, but reduce the network capacity, especially when multiple transmitters are competing for the channel using CSMA/CA. The project aims to build a reliable, low-latency video broadcasting solution for Wi-Fi by combining resilient video/image coding, FEC, and collision-free scheduling of transmitters.

Publications

Content-Aware Compression using Saliency-Driven Image Retargeting for Wireless Video-Thumbnail

Content-Aware Compression using Saliency-Driven Image Retargeting for Wireless Video
September 18, 2013
International Conference on Image Processing (ICIP) 2013
Paper File [pdf, 8.78 MB]

Wireless Networking for Automated Live Video Broadcasting-Thumbnail

Wireless Networking for Automated Live Video Broadcasting
June 20, 2011
IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks (WoWMoM) 2011
Paper File [pdf, 2.16 MB]

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