On Sun, Dec 20, 2009 at 3:01 AM, Kevin.Liu <[email protected]> wrote:
> 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. > This is not strange, it's perfectly normal. Doing the math, your video file is 1.3 mbit/sec (48 mbit / 37 seconds), while your mp3 file is 132 kbit/sec (40 mbit / 301 seconds), or roughly one-tenth the bandwidth of your video file. Your problem is obvious: your network does not have enough bandwidth to transmit the video in real-time, and you're experiencing packet loss (from the sound of it, you have about 1 mbit/sec of bandwidth). You're experiencing packet loss because your network is insufficient to transmit the video stream, which is _much_ larger than the audio stream. Like Ross said, get more bandwidth or smaller media.
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