| Abstract | While there is an increasing demand for streaming video applica-tions on the Internet, various network characteristics make the de-
ployment of these applications more challenging than traditional
TCP-based applications like email and the Web. Packet loss can be
detrimental to compressed video with interdependent frames be-
cause errors potentially propagate across many frames. While la-
tency requirements do not permit retransmission of all lost data,
we leverage the characteristics of MPEG-4 to selectively retrans-
mit only the most important data in the bitstream. When latency
constraints do not permit retransmission, we propose a mechanism
for recovering this data using postprocessing techniques at the re-
ceiver. We quantify the effects of packet loss on the quality of
MPEG-4 video, develop an analytical model to explain these ef-
fects, present a system to adaptively deliver MPEG-4 video in the
face of packet loss and variable Internet conditions, and evaluate
the effectiveness of the system under various network conditions.
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