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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-boun...@us.live555.com> De la part de Ross Finlayson
Envoyé : jeudi 20 janvier 2022 10:42
À : LIVE555 Streaming Media - development & use <live-de...@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-de...@us.live555.com> wrote:
>
>
> From: BENMOUSSA Yahia - Contractor <yahia.benmou...@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@lists.live555.com'" <live-de...@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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