[Live-devel] Live555server Video Stream Slowdown

Ross Finlayson finlayson at live555.com
Fri Oct 3 14:31:45 PDT 2008

At 09:46 AM 10/3/2008, you wrote:
>When streaming certain transport stream files (making a request from 
>an RTSP client to the server), the server does not play the video at 
>the expected speed. An example of the video is at 
><http://www.w6rz.net/>. The file 
><http://www.w6rz.net/parkrun1280_12mbps.ts> streamed from the server 
>is much slower than it should be. Additionally, it seems as though 
>that playback is not steady, meaning it looks as if it keeps a 
>constant speed (the slower speed), and periodically jumps ahead a little.

Almost 1 year ago (November 2007) someone asked a similar question 
about the same (I think) file.  At that time, I tried streaming this 
file from the "LIVE555 Media Server" to VLC, both running on the same 
computer (to eliminate possible networking problems as the cause).  I 
didn't see any problem:

This suggests that the problem is network-related (either the network 
itself, or networking software in your OS or device driver).  Are you 
sure that you have sufficient network capacity for this stream?

>I am wondering if the video is being throttle to compensate for the 
>audio timing.

No.  A Transport Stream is streamed 'as is'; the software does not 
know or care whether a Transport Stream packet contains audio, video, 
or whatever.

	Ross Finlayson
	Live Networks, Inc. (LIVE555.COM)

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