Packet drops while sending data over internet using udpsink/udpsrc

ankitjain ankit_jain at
Tue Nov 29 13:02:32 PST 2011


I am trying to transfer live webcam feed over internet. 
My setup:
I am using two Reliance 3G datacards (upload: ~350 kbps down: 1.2 Mbps)
connected to two different laptops. 

I am running the following pipeline on one of the laptops:

gst-launch-0.10 v4l2src ! ffmpegcolorspace !
video/x-raw-yuv,format=\(fourcc\)I420 ! videoscale !
video/x-raw-yuv,width=320,height=240 ! videorate !
video/x-raw-yuv,framerate=\(fraction\)15/1 ! x264enc bitrate=200
tune=zerolatency ! rtph264pay config-interval=5 ! udpsink port=12000
host= -v

and the below one on other laptop:

gst-launch-0.10 udpsrc port=12000 ! "application/x-rtp, media=(string)video,
clock-rate=(int)90000, encoding-name=(string)H264,
payload=(int)96, ssrc=(uint)1152645577, clock-base=(uint)1615839529,
seqnum-base=(uint)7545" ! rtph264depay ! ffdec_h264 ! xvimagesink sync=false

I am able to get the video at the other end (I handle NATing and port
opening issues separately). However there are too many packet drops in the

To test the network, I started skype clients on both the laptops and started
video call between the two laptops. The video quality was excellent with
almost no packet loss. 

I want to know if I am doing anything wrong? Have I missed out on any buffer
settings, etc? please give me some pointers on what settings of rtp, udp
plugins can I tweak.

Thanks in advance


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