This paper presents an efficient approach for supporting wireless video full interactive services. One of the main goals
of wireless video multicast services is to provide priority including dedicated bandwidth, controlled jitter (required by
some real-time and interactive traffic), and improved loss characteristics. The proposed method is based on storing
multiple differently encoded versions of the normal/interactive video streams at the server. The corresponding video
streams are obtained by encoding the original uncompressed video file as a sequence of I-P(I) frames and I-P(M) frames
using different GOP (Group Of Pictures) pattern. Mechanisms for controlling the normal/interactive request are also
presented and their effectiveness is assessed through extensive simulations. Wireless normal/interactive video services
are supported with considerably reduced additional delay and acceptable visual quality at the wireless client-end.
This paper assesses the media synchronization quality of preventive control schemes employed at media sources
and media destinations for voice and video over a network. Preventive control is required to try to avoid
asynchrony (i.e., out of synchronization). We here deal with two preventive control techniques employed at
sources: Advancement of transmission timing of media units (MUs), each of which is the information unit for
media synchronization (e.g., a video picture), with network delay estimation and temporal resolution control
of video. We also handle three preventive control techniques employed at destinations: Change of buffering
time with network delay estimation, preventive pausing, and preventive shortening of output duration. By
experiment, we make a performance comparison among preventive control schemes which employ the preventive
control techniques at sources and destinations. We also clarify the relations between subjective and objective assessment results.
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