IPTV only one stream can be recorded at a time

[rojerki]

My internet provider also provides IPTV streams as part of their service. Generally these work fine and there is no published limit to the max number of streams. (I have run multiple streams in different instances of VLC without problem).
When using NextPVR hosted in Docker on a QNAP NAS, I am limited to receiving one stream only using the IPTV device. Trying to start a parallel stream fails with a 'Streaming Failed (transcoder exited)' or other error message.

The provider is using multicast, and the m3u file has this structure
#EXTINF:0 tvg-logo="https://api.tv.init7.net/media/logos/Arte_HD.png" tvg-name="ARTE.de" group-title="de", Arte HD
udp://@239.77.0.82:5000
#EXTINF:0 tvg-logo="https://api.tv.init7.net/media/logos/3Sat_HD_7OaGlQ6.png" tvg-name="3sat.at" group-title="de", 3Sat HD
udp://@239.77.0.106:5000


At the moment I have Max Streams set to '3' but have also had it set at '32'.

The Docker container network is set to 'Host' mode.

Maybe I am missing something obvious that a lot of Googling hasn't turned up.

[sub]

Can you try using two streams at the same time, then post the logs?

We admittedly don't have many people using udp streams, so I'm not sure this has been thoroughly tested. I should be able to find the cause and get it fixed though. (I'm pretty sure I know approximately what is going wrong)

[rojerki]

Thanks

Two recordings scheduled, one failed 'undefined'.