[Live-devel] Real-time Video Viewing

[David Arnold]

Ross,

Thanks for your response.  I found the vlcrc file and set the "rtsp-caching"
variable to "10", which did help.  But, after a few seconds of viewing, VLC
starts to spit the following message several times:

"[00000304] main video output warning: late picture skipped (45684)"

At a later point, this message is seen:

"[00000276] ffmpeg decoder error: more than 5 seconds of late video ->
dropping frame (computer too slow ?)"  At which point VLC completely stops
presenting the frames, but the LIVE555 server continues to stream.

When I don't set the rtsp-caching variable I don't see these messages and
the stream can be viewed in VLC with no problems, except the 2 second delay
(due to caching).

I realize this might be more appropriate for a VLC discussion list, but I
figured I must be doing something wrong in my FramedSource derived class.
Could this be a problem with how I'm setting fPresentationTime?

I'm just trying to understand what's causing this problem.

Thanks again,

Dave Arnold
Future Concepts



-----Original Message-----
From: live-devel-bounces at ns.live555.com
[mailto:live-devel-bounces at ns.live555.com]On Behalf Of Ross Finlayson
Sent: Tuesday, December 06, 2005 12:10 PM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] Real-time Video Viewing


At 11:40 AM 12/6/2005, you wrote:
>We have an application that requires real-time viewing of an RTSP/RTP video
>stream.  We need near-zero latency between when a video frame is captured
>and when it is presented on the camera viewer.  The video streamer/server
is
>based on LIVE555 using a custom video source derived from FramedSource.
The
>camera viewer is a VideoLAN VLC ActiveX Control.  I have tried setting the
>VLCOption ":rtsp-caching=0", but this doesn't have any effect.

Try also using the "Preferences" menu in the GUI.  (Note that you'll
need to click the "Advanced options" check box to see the "caching
value (ms)" entry.)

>   I'm
>currently getting about a 2-3 second delay in the video stream.
>
>Any suggestions would be greatly appreciated.

Because you have complete control over your server (i.e., source
code), it should be easy for you to figure out how much of this
latency is occurring in the server, and where.


	Ross Finlayson
	Live Networks, Inc. (LIVE555.COM)
	<http://www.live555.com/>

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