The VideoLAN Forums

Hello, everyone

First, I thank all the people who helped me or paid attention to all my questions.
Now I'm working on the Streaming with DirectShow part of VLC, I want to talk about the delay in
streaming play. I got a camera in my PC, and I want to capture video in one VLC terminal, but to play the video in another one.
It works well--thanks to ALL the developers of the VLC , then I test the delay, it's about 1.7s, that's not acceptable, I think.
So I post this message to ask help about the delay in VLC.
In the beginning, I thought it's the network issues the delay, but it's not that long.
And now I focus on the VLC modules, such as buffer allocation, the package parses, etc.
How is your suggestion? You can give me a reply.
ANY information is WELCOMED.

Regards,
yKevin

Decrease caching. Use UDP or RTP streaming.

I used UDP streaming.
But I think decrease catching may work, and how can I do that? Need I configure with VLC or modify the source code?

Thanks
yKevin

F.Y.I, I used the 0.8.6e version.

Thanks
yKevin

You should configure the cache on the receiving vlc player.

input/access modules/udp

NB by default it is 300ms, so no big hope of reducing dramatically the delay there

On "server side", you have stream output/access output/udp that is also at 300ms and maybe you can tune it down a bit.

now to get to 1.7 second of delay, there must be something in the transcoding layer that is also caching.
Maybe choosing a smaller GOP size helps (maybe vlc caches a full gop, and that could be a second.
If that can be tuned, it may improve your delay.

remember that lowering cache value will have side effects on you video quality ...
1.7 seconds of delay is quite commonly accepted. Although I understand you may want to try to lower his

No, you can do way better than 1.7 seconds, especially on LAN.

Thanks to georgesdev and j-b,
and I think 1.7s is not that acceptable in the project,
so I'll work on decrease catching in the source code of VLC.

Regards,
yKevin

You can decrease your dshow caching to something pretty low in a normal machine.

Mux in TS/udp and set your client caching in UDP a bit lower than usual.