Hi all : I have made a test on window mobile for openRTSP and I also add the "-q" option which will print the qos message . And i got the print message showed that I have lost about 30% packets . I have extended the socket receive buffer to 2,000,000 and I also used the live555 media server included in the source code.
The strange thing is that if I transport only audio stream like "mp3 file" the packet lost was very small ,but if I transport both audio and video stream like "mp4,mpg files" the packet loss was really big. And I found that a 6M mpg file only transport 37 seconds (sdp message "a=range:npt=0-37.160") but a 5M mp3 file transport 301 seconds in the same network environment. My live555 version is 2009,9,28 and I have test the lib on pc it worked really good . Any advice for the question ? please help me out of the strange problem ! Thank in advance. Following are the sdp message I got : 1.Mpg file(size 6M) v=0 o=- 924739507 1 IN IP4 192.168.1.100 s=MPEG-1 or 2 Program Stream, streamed by the LIVE555 Media Server i=pict.mpg t=0 0 a=tool:LIVE555 Streaming Media v2009.09.28 a=type:broadcast a=control:* a=range:npt=0-37.160 a=x-qt-text-nam:MPEG-1 or 2 Program Stream, streamed by the LIVE555 Media Server a=x-qt-text-inf:pict.mpg m=video 0 RTP/AVP 32 c=IN IP4 0.0.0.0 a=control:track1 m=audio 0 RTP/AVP 14 c=IN IP4 0.0.0.0 a=control:track2 2.Mp3 file(size 5M) v=0 o=- 5850143118 1 IN IP4 192.168.1.100 s=MPEG-1 or 2 Audio, streamed by the LIVE555 Media Server i=test3.mp3 t=0 0 a=tool:LIVE555 Streaming Media v2009.09.28 a=type:broadcast a=control:* a=range:npt=0-301.840 a=x-qt-text-nam:MPEG-1 or 2 Audio, streamed by the LIVE555 Media Server a=x-qt-text-inf:test3.mp3 m=audio 0 RTP/AVP 14 c=IN IP4 0.0.0.0 a=control:track1 Best regards, Kevin Liu
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