Casting from Firefox to smart TV using fx_cast and Avahi

Running nmap -sV -p 1-65535 TV_IP:

vitor@vitor-Inspiron-5379:~/tmp/miraclecast/res$ sudo nmap -sV -p 1-65535 192.168.1.25
Starting Nmap 7.80 ( https://nmap.org ) at 2021-03-10 22:47 GMT
Nmap scan report for 192.168.1.25
Host is up (0.062s latency).
Not shown: 65524 closed ports
PORT STATE SERVICE VERSION
1291/tcp open upnp LG WebOS TV upnpd (model: UJ634V; WebOS 0.9; UPnP 1.0; DLNADOC 1.50)
1529/tcp open upnp LG WebOS upnpd (WebOS 1.5; UPnP 1.0)
1535/tcp open upnp LG WebOS upnpd (WebOS 4.1.0; UPnP 1.0)
1848/tcp open upnp Platinum unpnd 1.0.4.9 (arch: i686; UPnP 1.0; DLNADOC 1.50)
1918/tcp open upnp Platinum unpnd 1.0.4.9 (arch: i686; UPnP 1.0; DLNADOC 1.50)
3000/tcp open http LG smart TV http service
3001/tcp open ssl/http LG smart TV http service
9080/tcp open http Mongoose httpd
9998/tcp open http Google Chromecast httpd
18181/tcp open opsec-cvp?
36866/tcp open unknown
1 service unrecognized despite returning data. If you know the service/version, please submit the following fingerprint at https://nmap.org/cgi-bin/submit.cgi?new-service :
SF-Port36866-TCP:V=7.80%I=7%D=3/10%Time=60494C8E%P=x86_64-pc-linux-gnu%r(G
SF:etRequest,52,"HTTP/1\.1\x20404\x20Not\x20Found\r\nDate:\x20Wed,\x2010\x
SF:20Mar\x202021\x2022:47:42\x20GMT\r\nConnection:\x20close\r\n\r\n")%r(Fo
SF:urOhFourRequest,52,"HTTP/1\.1\x20404\x20Not\x20Found\r\nDate:\x20Wed,\x
SF:2010\x20Mar\x202021\x2022:47:47\x20GMT\r\nConnection:\x20close\r\n\r\n"
SF:);
MAC Address: 04:4E:AF:66:85:7E (LG Innotek)
Service Info: OS: Linux; Device: media device; CPE: cpe:/h:lg:uj634v, cpe:/o:linux:linux_kernel

Service detection performed. Please report any incorrect results at https://nmap.org/submit/ .
Nmap done: 1 IP address (1 host up) scanned in 115.13 seconds

Seems to confirm that Chromecast should be working I think.

I can ping the TV:

vitor@vitor-Inspiron-5379:~/tmp/miraclecast/res$ ping 192.168.1.25
PING 192.168.1.25 (192.168.1.25) 56(84) bytes of data.
64 bytes from 192.168.1.25: icmp_seq=1 ttl=64 time=5.29 ms
64 bytes from 192.168.1.25: icmp_seq=2 ttl=64 time=4.91 ms
^C
--- 192.168.1.25 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1002ms
rtt min/avg/max/mdev = 4.910/5.100/5.291/0.190 ms

avahi-resolve however fails:

vitor@vitor-Inspiron-5379:~/tmp/miraclecast/res$ avahi-resolve -v -a 192.168.1.25
Server version: avahi 0.7; Host name: vitor-Inspiron-5379.local
Failed to resolve address '192.168.1.25': Timeout reached

Adding the TV to /etc/hosts does make avahi-resolve works:

vitor@vitor-Inspiron-5379:~/tmp/miraclecast/res$ avahi-resolve -v -a 192.168.1.25
Server version: avahi 0.7; Host name: vitor-Inspiron-5379.local
192.168.1.25 lgwebos.local

But fx_cast still can't find the device (nor it shows up in avahi-browse, which is why I believe it's not showing up in fx_cast).

Does it work OK from Google Chrome on the same Ubuntu install?

Yes, it does work from Chrome on the same Ubuntu machine:

https://imgur.com/tThuupb

OK then I suggest you contact the Git maintainer to see if they can help. You can use Chrome in the meantime as as stop gap. Maybe others can assist. I don't use Firefox myself.

Possibly this
https://linuxhint.com/stream_linux_to_tv/

There's an application you can use to cast local video or (as far as I can see) the whole desktop

I even have constructed a local replica of libaom2.Zero.2, possibly update to two.1.0 soon, however recompiling ffmpeg proved to be quite tough for some motive, and I dread to think about gstreamer... As it's far I'm the usage of aomenc, blanketed with libaom. See more here https://www.bestpicktv.com/how-to-factory-reset-samsung-smart-tv/