report of summer work 宋惟農 2008/09/02. 2 outline iptv study zigbee controller for iptv
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Report of Summer Work
宋惟農2008/09/02
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Outline
IPTV study ZigBee controller for IPTV
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IPTV study
What’s IPTV Solution of QoS Solution of QoE Channel zapping
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What’s IPTV
Internet Protocol Television (IPTV): The Killer Application for the Next-Generation Internet, IEEE Communications Magazine, November 2007
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What’s IPTV
IPTV advantage: High video quality Two way communication.
IPTV technical challenge: QoS (Quality of Service)
Bandwidth of Internet is limited. QoE (Quality of Experience)
Channel zapping is too slow.
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IPTV study
What’s IPTV Solution of QoS Solution of QoE Channel zapping
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Solution of QoS
Multicast It needs only one flow in backbone for multiple users t
o watch the same channel. Not fully supported until IPv6.
Admission control Only permitted user can watch IPTV.
類似現在有線電視不可以自己偷接，付多少錢才能看多少。
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IPTV study
What’s IPTV Solution of QoS Solution of QoE Channel zapping
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Solution of QoE
Fast channel zapping Fast Channel Switching For Hybrid Unicast/Broadcast
Mobile Television, Broadband Multimedia Systems and Broadcasting, 2008 IEEE International Symposium on, pp. 1-4, March 31 2008-April 2 2008
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IPTV study
What’s IPTV Solution of QoS Solution of QoE Channel zapping
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Channel zapping
Traditional channel zapping New channel zapping with new coding method
for MPEG 4 Our channel zapping with different bit rate My plan
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Traditional channel zapping
1. Stop current channel
2. Ask for new channel
3. Wait for next I-frame (MPEG 4 only)
4. Wait for buffering
5. Play new channel
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Channel zapping
Traditional channel zapping New channel zapping with new coding method
for MPEG 4 Our channel zapping with different bit rate My plan
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New channel zapping with new coding method for MPEG 4 I-frame (intra frame): base image P-frame (other frame): difference from base image Method:
Ask for last I-frame. Server encode current frame as I-frame. Another flow to transmit I-frame of all channels.
Advantage: About 2~3 seconds faster 5 seconds -> 2~3 seconds.
Disadvantage: Private encoder and decoder
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Channel zapping
Traditional channel zapping New channel zapping with new coding method
for MPEG 4 Our channel zapping with different bit rate My plan
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Our channel zapping with different bit rate Transmit neighbor or favorite channels with lower bit
rate simultaneously. Advantage:
0 zapping time! (Buffer switch only) Disadvantage:
Additional bandwidth Users can only choose specific channels.
Extra advantage: Serve different kind of device simultaneously.
Ex: Handheld device and TV, big screen and small screen
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Channel zapping
Traditional channel zapping New channel zapping with new coding method
for MPEG 4 Our channel zapping with different bit rate My plan
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My plan
Server: VLC Client: Qt Why Qt not VLC?
The API of VLC is not full developed, we can’t control the action of lower level. Qt can.
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Outline
IPTV study ZigBee controller for IPTV
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ZigBee controller for IPTV
Computer COM port
Transceiver
Controller
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ZigBee controller for IPTV
主畫面 Pre
上一個選單 Play
播放 Pause
停止播放 Next
下一個選單
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ZigBee controller for IPTV
音量調整 Pre
上一個選單 +
大聲 -
小聲 Next
下一個選單
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ZigBee controller for IPTV
頻道選擇 Pre
上一個選單 +
下一台 -
上一台 Next
下一個選單
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ZigBee controller for IPTV
畫面調整 Pre
上一個選單 Type
畫面類型 Single, Double, Quad
Screen 主控畫面切換
Next 下一個選單
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ZigBee controller for IPTV
無線傳輸功率調整 Pre
上一個選單 +
功率加強 -
功率減弱 Next
下一個選單
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ZigBee controller for IPTV
Future work Player程式的開關 睡眠模式 (省電 )
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Thank You~