[Live-devel] A Problem of RTSP Server

Tue Aug 28 01:54:47 PDT 2012

Dear Ross,

Currently, we have many PCs on which VLC Media Player is installed. Most of them (VLC RTSP clients) can correctly display the image from our RTSP server. However, some can't with black screen (no any image). I don't know Why? The following message is shown by VLC Media Player:

main error: ES_OUT_RESET_PCR is called

I debug our RTSP server. It seems that image frames are continuously and correctly delivered out.

Do you have any idea about this? Thank you again for your comment in advance.

BR,

Eden

From: live-devel-bounces at ns.live555.com [mailto:live-devel-bounces at ns.live555.com] On Behalf Of Ross Finlayson
Sent: Wednesday, August 15, 2012 3:50 PM
To: LIVE555 Streaming Media - development & use
Subject: Re: [Live-devel] A Problem of RTSP Server

I change OutPacketBuffer::maxSize to be 300000. The display of local RTSP client is correct. Unfortunately, the remote client's display is still incorrect. Do you have any idea about this situation?

No, but because you're seeing problems only with a remote (networked) VLC RTSP client, I suspect you're seeing some network packet loss.  As I said before: "[You should not be sending] such ridiculously large NAL units.  You should reconfigure your encoder to encode each IDR picture (i.e., 'I-frame') into multiple 'slice' NAL units.  This is a good idea, because if packets forming a 'slice' NAL unit get lost, then that will cause only that slice to be non-renderable.  On the other hand, if the IDR picture is a complete NAL unit, then the loss of *any* packet will cause the whole picture to be non-renderable."

Ross Finlayson
Live Networks, Inc.
http://www.live555.com/

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