A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : RTCP-based Feedback: Concepts and Message Timing
Rules
Author(s) : S. Wenger, J. Ott
Filename : draft-wenger-avt-rtcp-feedback-02.txt
Pages : 21
Date : 08-Mar-01
Real-time media streams are not resilient against packet losses. RTP
[1] provides all the necessary mechanisms to restore ordering and
timing to properly reproduce a media stream at the recipient. RTP
also provides continuous feedback about the overall reception quality
from all receivers -- thereby allowing the sender(s) in the mid-term
(in the order of several seconds to minutes) to adapt their coding
scheme and transmission behavior to the observed network QoS.
However, except for a few payload specific mechanisms [2], RTP makes
no provision for timely feedback that would allow a sender to repair
the media stream immediately: through retransmissions, retro-active
FEC, or media-specific mechanisms such as reference picture
selection.
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