[Live-devel] Problem when multi client connect to server using OndemandServerMediaSubsession

[Nguyen Van Long]

Dear Live555 team,

I recently develop an application that uses live555 library and operates
simple tasks such as: get video data from camera, decode video data, draw
something on video frame, encode video frame and streaming. My application
is a client (to camera) and also a server when streaming video data.

To get video data from camera, I modified the testRTSPClient in testProgs.
Data received then decoded using ffmpeg and drawn some text, shape using Qt.
After that, I use ffmpeg again to encode video frame (codec is MJPEG-4) and
put the output into a queue which will be streamed later.

To stream video from  a queue, I write a class based on DeviceSource, the
function doGetNextFrame always read mpeg-4 package from queue and calls
FrameSource::afterGetting(this) when data available. I also write a class
called Mpeg4LiveServerMediaSubsession which subbed class from
OnDemandServerMediaSubsession and re-implement three virtual functions
(getAuxSDPLine, createNewFrameSource, createNewRTPSink). The
createNewFrameSource actually return the
MPEG4VideoStreamDiscreteFramer::createNew() with input source parameter is
my class based on DeviceSource described above.

I use VLC as client to connect to my server and play video stream.
Everything seems ok and my application works quite fine when there are less
than 4 clients connect to server. When the 4th client connect to server, the
video of all clients is getting slower, image is very bad, I cannot see
video content clearly . 

I don't think the problem is with my network because I use LAN with a good
capable and even my server and client (VLC) in the same computer, this
problem still happens. 

I have some more information here: 

My processor : corei3 3.36 MHz, Memory (RAM): 4GB, When 4 client connect to
server, program uses 30% of memory, 49% of CPU

When 1 client (VLC) connect to server, from VLC tool I see that the content
birate is about 6000 - 7000 kb/s. It reduce to 4000 - 5000 kb/s when 2
clients connect to server, 2000 - 2500 kb/s when 3 clients connect to server
and 600 - 1500 kb/s when 4 clients connect to server. 

Do you have any ideals with my problem and any suggestions to improve video
quality when there are many clients connect to server? 

 

Thanks!

 

Regards,

 

Nguyen Van Long (Mr)

ESoft - Software Development 

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