[Live-devel] RTP packets duplication after a PAUSE/PLAY

[BENMOUSSA Yahia - Contractor]

Hi Ross,

I confirm that ffplay sends the PAUSE command.  I can also reproduce the issue using VLC. 3.0.11.1.

Please see the attached wireshark trace while using VLC. RTP duplication starts from packet 4225. 

https://www.dropbox.com/s/ksxsdhov2nukkmk/duplicated-RTP-packets.pcapng?dl=0

Regards. 

 


-----Message d'origine-----
De : live-devel <live-devel-bounces at us.live555.com> De la part de Ross Finlayson
Envoyé : jeudi 20 janvier 2022 10:42
À : LIVE555 Streaming Media - development & use <live-devel at us.live555.com>
Objet : Re: [Live-devel] RTP packets duplication after a PAUSE/PLAY



> On Jan 20, 2022, at 8:51 PM, BENMOUSSA Yahia - Contractor via live-devel <live-devel at us.live555.com> wrote:
> 
> 
> From: BENMOUSSA Yahia - Contractor <yahia.benmoussa at external.thalesgroup.com>
> Subject: RTP packets duplication after a PAUSE/PLAY
> Date: January 20, 2022 at 8:51:26 PM GMT+13
> To: "'live-devel at lists.live555.com'" <live-devel at us.live555.com>
> 
> 
> Hi Ross,
>  
> We have observed a strange behavior in media server starting from version 2021.05.22. 
>  
> After sending a PAUSE/PLAY command, the RTP packets are duplicated. Actually, the wireshark trace shows that each RTP packet is sent twice with the same payload and sequence number.
>  
> If we send another PAUSE/PLAY commands within the same session, the RTP packets are then duplicated 3 times and so on ...
>  
> It seems that it is a true packet duplication since the bandwidth usage increases after each PAUSE/PLAY commands.
>  
> This issue  can be reproduced using ffplay and the last version of live555MediaServer.

I wasn’t able to reproduce this using “live555MediaServer” and VLC as the client.  I suspect that the problem is “ffplay”; it’s not a very good RTSP client implementation.  I suspect that it’s not really sending a RTSP “PAUSE” command, but is sending a new RTSP “PLAY” command each time it resumes, which will produce the duplicated stream.


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


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