DLNA with Panasonic DMR-BCT750/755 does not work

[DSLinuxUser]

Hello,

I installed JellyFin on my TrueNAS system and trying for a while now, to access with
a Panasonic DMR-BCT750/755 my JellyFin installation.

I looked into other issues and hints, but nothing worked, the Panasonic always displays the message "Can't connect to
the server".
Today I captured with tcpdump the traffic between the Panasonic and Jellyfin.
I don't know if this is red herring, but JellyFin sends a XML file "description.xml" containing this URL:
http://192.168.0.1:8096/dlna/11111111-2222-3333-4444-555555555555/icons/logo120.png

The Panasonic tries to access it, but gets a 404.
If I access this URL through Firefox I get the same error.

What do I need to do to fix this problem?

Sincerely,
DSLinuxUser

[FelixPetriconi]

The problem is that the icons are not part of the compiled resources.
PR is on its way.

[DSLinuxUser]

Thank you in advance, hopefully this is the only issue the Panasonic has.

[FelixPetriconi]

Unfortunately not for me. I see the DLNA source in the player, but when I try to connect then it immediately shows an error that it cannot connect.
I already started comparing the TCP traces between a local installation of Jellyfin and Emby. I hope that I can come up with more information the next days.

[DSLinuxUser]

Sadly you are right.
Now the Panasonic shows the JellyFin icon, but with selection of the JellyFin server,
just the previous "Unable to connect" error appears.

I am not really sure, what I am looking at, the Panasonic sends a Server-ID as SSDP to the JellyFin(?):

Simple Service Discovery Protocol
    HTTP/1.1 200 OK\r\n
        Response Version: HTTP/1.1
        Status Code: 200
        [Status Code Description: OK]
        Response Phrase: OK
    CACHE-CONTROL: max-age=1800\r\n
    DATE: Mon, 23 Dec 2024 16:02:49 GMT\r\n
    EXT:\r\n
    LOCATION: http://192.168.0.2:60607/ABCDEF123456/Server1/ddd\r\n
    SERVER: Linux/4.0 UPnP/1.0 Panasonic-UPnP-MW/1.0\r\n
    ST: urn:schemas-upnp-org:service:AVTransport:1\r\n
    USN: uuid:ABCDEF12-0300-1000-8000-ABCDEF123456::urn:schemas-upnp-org:service:AVTransport:1\r\n
    \r\n

After that, the JellyFin-Server sends to the Panasonic these 3 UDP packets:

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: upnp:rootdevice
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC::upnp:rootdevice
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: uuid:12345679-1111-2222-3333-123456790ABC
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: urn:schemas-upnp-org:device:MediaServer:1
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC::urn:schemas-upnp-org:device:MediaServer:1
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

After these the Panasonic tries to send 3 ICMP packets to JellyFin,
which Wireshark marks as "Destination unrechable (Port unrechable)":

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: upnp:rootdevice
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC::upnp:rootdevice
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: uuid:12345679-1111-2222-3333-123456790ABC
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

HTTP/1.1 200 OK
EXT: 
DATE: Mon, 23 Dec 2024 16:02:56 GMT
HOST: 239.255.255.250:1900
CACHE-CONTROL: max-age = 1800
ST: urn:schemas-upnp-org:device:MediaServer:1
SERVER: Unix/6.6.32.0 UPnP/1.0 RSSDP/1.0
USN: uuid:12345679-1111-2222-3333-123456790ABC::urn:schemas-upnp-org:device:MediaServer:1
LOCATION: http://192.168.0.1:8096/dlna/12345679-1111-2222-3333-123456790ABC/description.xml

If I try to access the description.xml through Firefox, I am getting it delivered.
The URLs for the different logo sizes are working.
I tried the other URLs too:

• presentationURL: Works, redirects me to the login page of JellyFin, what is okay in a browser
• contentdirectory/contentdirectory.xml: a XML file, starts and ends with scpd tag, looks okay for me
• contentdirectory/control: if accessed through web browser, it is just empty
• contentdirectory/events: is empty too
• connectionmanager/connectionmanager.xml: a XML file, starts and ends with scpd tag, looks okay for me
• connectionmanager/control: empty again
• connectionmanager/events: empty too

Hm.....the Panasonic says in LOCATION port 60606 or 60607 should be used, but the UDP packets are send
to the port 51873, according to Wireshark.
Also I see at least once the LOCATION http://192.168.0.2:61118/ABCDEF123456/dial_srv/ddd/dial.xml
Maybe the Panasonic devs implemented DLNA weirdly?
Because the DMR-BCT750/755 can accept a DLNA stream through push.
This means, that I can take e.g. VLC, start a video and tell it to stream the video to the Panasonic through DLNA.

[FelixPetriconi]

According to my investigation it is a problem of incorrect responses.
This PR contains fixes that correct the responses. It would be great if you could confirm them.

[DSLinuxUser]

What do I need to do?
Compile the DLNA plugin from scratch and inject it somehow into the Jellyfin-Container on TrueNas?

[FelixPetriconi]

I don't know how to build anything under Linux. But you can build everything under Windows and export it as Linux build. Then copy all into the Linux machine/Docker container, depending on how you are using it.

[DSLinuxUser]

Was a bit tricky, but I did it.

Don't know if anyone will add this tidied up to documentation, but nonetheless.

To compile it plugin, a compiler environment with netframework 8 is needed.
Tried it with code and codium, but they only generated errors for me, despite having dotnet-8-sdk installed.
VSCode from MS detected it as netframework 8 project, offered to download the needed files, what I accepted,
and was able to compile it through Terminal->Run Task->dotnet:build .
The binary files had been saved to jellyfin-plugin-dlna/src/Jellyfin.Plugin.Dlna/bin/Debug/net8.0/ .

To use the new version, I needed to get a bit creative:

• I stopped the container through "Apps" in the Truenas Scale UI
• Uploaded the generated files to a shared directory
• Opened a Shell on TrueNas and found out, that plugins are treated as user configuration and can be found in the persistent container config folder, for me it was /mnt/mynas/ix-applications/releases/jellyfin/volumes/ix_volumes/config/plugins/DLNA_6.0.0.0
• Made a backup of the whole folder with tar
• Copied the modified files into DLNA_6.0.0.0 and started the JellyFin again

I approved the PR and will close this issue, when a new version of the plugin will be released.