TITRE Adaptive Packet Video Streaming Over IP Networks - LaBRI

0.3
0.25
our proposal
classical approach
AU’s end-to-end delay transmission
0.2
Delay(s)
0.15
0.1
0.05
0
0 50 100 150 200
AU’s sequence number
Figure 4-18: End-to-end AU’s transmission delays.
In the other hand, the instantaneous losses measurements (see Figure 4-19) reveal a better
behavior in our proposal. In Figure 4-20, we experiment a loss of 4 adjacent AUs from a single
CELP voice stream per RTP packet lost. While in [159] proposal, the RTP packet loss induces the
loss of 12 adjacent AUs from the same CELP voice stream. Thus, the loss of 240 ms of
compressed stream will lead to devastating consequences at the decoding side.
Also, when interleaving of AUs is deployed with the [159] approach. Both end-to-end delays
and losses tolerance remains an immense inconvenience due to the CELP low bit rate, AU small
size, and the number of AUs transported into each RTP packet
1.2
1
our proposal
classical approach
The AU’s loss rate
AU’s loss rate
0.8
0.6
0.4
0.2
0
0 20 40 60 80 100 120
Time(s)
Figure 4-19: Instantaneous AU’s loss rate.
Value calculated, every 1,2 seconds, for all the audio conference duration.
89