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Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 26 Mar 2018 20:59
by thejaquio
I am using OBS Studio to output a UDP multicast stream to my building, and viewing with VLC. I can view the stream just fine with VLC version 2.2.6, but the stream won't play (or it plays with audio only) in version 3.0.1.
The stream settings are as follows:
Container: mpegts
Video encoder: libx264 at 512kbps
Audio encoder: aac at 128kbps
Output resolution: 852x480
I've seen a few others on this forum with the same problem. Any help about how to fix this or what to change would be greatly appreciated.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 27 Mar 2018 10:33
by chubinou
Hello,
UDP mtu is limited in VLC 3.0 to 1316, you can set the packet size on OBS side by setting the address to "udp://1.2.3.4:4242?pkt_size=1316"
Though, I rather advise you, to use "rtp_mpegts" as a container on OBS side, and on VLC side to use rtp://@1.2.3.4:4242 rather than using raw UDP. Be sure to use an even port number.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 30 Apr 2018 20:42
by thejaquio
Thank you. This solved my issue. This solution works on both the old and new versions of VLC, so it eliminates the rush to upgrade. Thanks again.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 18 Jul 2018 22:44
by Aeium
Hello,
UDP mtu is limited in VLC 3.0 to 1316, you can set the packet size on OBS side by setting the address to "udp://1.2.3.4:4242?pkt_size=1316"
Though, I rather advise you, to use "rtp_mpegts" as a container on OBS side, and on VLC side to use rtp://@1.2.3.4:4242 rather than using raw UDP. Be sure to use an even port number.
Thank you!
Not only did you solve the problem I had, you pointed me to the problem I should have had and solved that too!
Amazing. Made my day.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 16 Aug 2018 16:22
by Fosfor
UDP mtu is limited in VLC 3.0 to 1316
Is there any possibility to change the MTU limit on the VLC side? Or any other workaround other than changing the stream source? I'm trying to figure our why receiving of UDP multicast is not working here neither in latest 3.x, nor in dev 4.x, but works in 2.x. I'm not getting any UDP MTU errors, but it seems, that actual packets are above the limit (1514 according to Wireshark).
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 21 Aug 2018 09:44
by chubinou
@Fosfor: you can try to set the mtu using the --mtu option or in advanced pref > Input/Codec > Network Settings > MTU of the network interface
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 23 Aug 2018 10:48
by Fosfor
Thanks chubinou, but neither helped. I tried to set MTU=1600 (as I have in version 2.2.8 ), but nothing changed. I already have some debug info, so I'll try to put it together and open a new topic.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 24 Aug 2018 16:48
by Rémi Denis-Courmont
The MTU must be adjusted on the sending side. The receiver is powerless to change packet size.
Re: Viewing UDP stream in v3.0.1 doesn't work. In v2.2.6 it works fine.
Posted: 24 Aug 2018 19:45
by Fosfor
So the settings suggested by chubinou have no effect?