Dan Granahan
Shen Li
Saagar Patel
Rob Williams
http://www.ece.cmu.edu/~ece549/spring07/team2/index.html
Project Re-Cap


Build a system that is
capable of streaming
video wirelessly to a
handheld device in
real-time.
This system will serve
as the basic
framework upon
which video sources
can be added
 Live television
 Home surveillance
 Other personal media
Parts
Nokia N 770
D-Link DCS-2100G
Wireless Internet Camera
Rob’s Desktop
System Architecture
Receive, Process, Redirect Data
User
Human
Interaction
802.11B
Display Data
Desktop Computer
Ethernet
Send Raw Data
TV Tuner
?
Nokia N770
Web Cam
DVD Player
?
Video Input Devices
Status Update
Able to give device app the HTTP
location of a sample MPG file and
stream it
 Created a Java server that encodes and
streams (static) video
 Created basic GUI that has "Play"
button so that it triggers streaming from
the source provided

Risks Mitigated
Not being able to develop on the device
 Not being able to stream and display
video simultaneously
 Not able to get root access
 Not being able to install packages
 Not being able to encode video

Mid-Semester Demo
D-Link DCS-2100G
Nokia N770
Next Steps
Connect server to device for live
streaming of video
 Process live video from TV tuner
 Performance benchmark of 352x288 @
15fps limitation
 More user-friendly GUI
 Channel-changing options for multiple
source streaming
 Real-time video selection

Software Architecture
Desktop
Handheld
Application: Handles input,
messaging, and
coordinates mplayer
Java Server
Real-time encoding video
with FFmpeg libraries
mplayer: does “heavy
lifting” for video processing
Andrew Space
Serves video from URL
Webcam
Uploads MPEG video into FFmpeg
Lessons Learned
Turn on the wireless connection
 Documentation is hard to understand
(when it exists)
 SSH saves time by increasing
productivity
 N770 lacks processing power to recover
from hiccups (need to drop some
frames). Also, sometimes it reboots.
 GTK sometimes unresponsive

Tentative Schedule
Week
Goal
Seven………………Mid-Semester Demo
Eight………………..SB (extra time for work)
Nine………………...Stream from Java server
Ten………………….Multiple Streams
Eleven……………...Real-Time Channeling
Twelve……………...Freak Out
Thirteen…………….System complete, Demo
Questions - Answers
?