DAB+ on 1 West (Generic Stream)

[cirio70]

A few days ago I came across this very interesting article:

Using GSE and DVB-S2 for IP traffic

and i found out the minitiouner is capable of decoding GSE.
"Great!" i said, I can finally try to listen to that dam* DAB radio on 1W (NRK).

So following the instructions in the article i installed "Longmynd" to control the Minitiouner and after a few try i managed to lock the 10722 V frequency!



it's now time to launch the "dvb-gse" program to see what happens. If there's no error i can send the decoded GSE to fedi2eti and finally listen o NRK DAB:



Unfortunately dvb-gse is not made for MIS stream so is not able to decode the stream..... But the Minitiouner (which has a STV0910....) is definitely able to manage GSE!

It's a first step and maybe someone with more skills than me can use this thread as a starting base to decode GSE

Bye,
John

 

[Adam792]

I’m guessing that Longmynd outputs baseband (BB ) frames, so you might be able to use bbfedi2eti rather than dvb-gse and fedi2eti to decode the DAB. It’s part of the same eti-tools suite.

Just to check though, is that the right mux that you’re tuning? It’s listed as 10720V but with SR 5400 rather than 2200.

 

[satesco]

Excellent article, @John, about the generic stream at 1.0W.

Those with 6903x/6909x cards have a good chance of accessing the NRK DAB stream with the following command line:
"dvbsnoop -adapter 3 -s ts -tsraw -b | ./bbframe-tools/pts2bbf | bbfedi2eti -dst-ip 239.199.2.1 -dst-port 1234 | dablin_gtk"

On how to decode the stream, you can usefully read the discussion between @mrwish7, @deeptho and @andimik on the Satelite sources of DAB feed topic on GitHub

 

[Adam792]

A few days ago I came across this very interesting article:

Using GSE and DVB-S2 for IP traffic

and i found out the minitiouner is capable of decoding GSE.
"Great!" i said, I can finally try to listen to that dam* DAB radio on 1W (NRK).

So following the instructions in the article i installed "Longmynd" to control the Minitiouner and after a few try i managed to lock the 10722 V frequency!

View attachment 154186

it's now time to launch the "dvb-gse" program to see what happens. If there's no error i can send the decoded GSE to fedi2eti and finally listen o NRK DAB:

View attachment 154187

Unfortunately dvb-gse is not made for MIS stream so is not able to decode the stream..... But the Minitiouner (which has a STV0910....) is definitely able to manage GSE!

It's a first step and maybe someone with more skills than me can use this thread as a starting base to decode GSE

Bye,
John

Actually, for dvb-gse, you will just need to add the --isi parameter ("--isi 171" for NRK DAB ), the error in the screenshot is just saying that you're running in SIS (single input stream) mode rather than MIS mode, the isi parameter with a stream number switches it to multi-stream mode according to the code here - GitHub - daniestevez/dvb-gse: Rust implementation of DVB-GSE

I think the frequency should be 10717 or 10720 V 5400 though!

 

[7mdish]

Looking into 2wcom web site (this manufacturer was suggested to me by another forum member last summer) I found this receiver:

FlexXtract+ - 2wcom DAB+ Distribution Extractor

The commercial 2wcom FlexXtract+ DAB+ Distribution Extractor demodulates an incoming DAB+ data stream, even if it is via IP, ASI or from a DVB-S or DVB-S2 signal and converts the data into a standard ETI-signal according to EN 300799 or an EDI-signal according to TS 102 693 to feed DAB or DAB+...

www.2wcom.com

Not sure if it can get these DAB transponders, but possibly yes.
And maybe, adding the ASI module in this box, analog and digital audio can be decoded through another professional receiver? I mean RX8200 or similar? What do you think?
PS: I know this is an extremely expensive solution.... but I have any idea to buy it.... don't worry-

 

[cirio70]

Actually, for dvb-gse, you will just need to add the --isi parameter ("--isi 171" for NRK DAB ), the error in the screenshot is just saying that you're running in SIS (single input stream) mode rather than MIS mode, the isi parameter with a stream number switches it to multi-stream mode according to the code here - GitHub - daniestevez/dvb-gse: Rust implementation of DVB-GSE

I think the frequency should be 10717 or 10720 V 5400 though!

Hi,
after tuning to the right freq. and adding the --isi 171 parameter i got this:

ERROR dvb_gse::bbframe] unsupported TS/GS type 'generic packetized' (only 'Generic Continuos is supported)'

Tomorrow, with more free time i'll try something else,,,,

 

[Adam792]

Hi,
after tuning to the right freq. and adding the --isi 171 parameter i got this:

ERROR dvb_gse::bbframe] unsupported TS/GS type 'generic packetized' (only 'Generic Continuos is supported)'

Tomorrow, with more free time i'll try something else,,,,

Oh that’s odd, it will probably work with bbfedi2eti instead of DVB-GSE, but you’d need to find a way of piping the BBframe output of Longmynd into that tool instead.

 

[newspaperman]

I think both tools need to be patched. Maybe it's easier to path the dvb-gse.
in bbframe.rs drop these lines 132-138

 if !matches!(bbheader.tsgs(), TsGs::GenericContinuous) {
            log::error!(
                "unsupported TS/GS type '{}' (only 'Generic continous' is supported)",
                bbheader.tsgs()
            );
            return false;
        }

my bbfedti2eti tool requires that there is one 0xB8 sync byte inserted into the received stream at every start of a BBframe.

 

[cirio70]

I think both tools need to be patched. Maybe it's easier to path the dvb-gse.
in bbframe.rs drop these lines 132-138

I did what @newspaperman suggested:
deleted the lines im bbframe.rs
clean the cache to rebuild dvb-gse

 cargo clean

rebuild dvb-gse

 cargo build

i got a warning but everything seemed to work fine.
now i got this:


I'm going on vacation tomorrow, when i'll be back i'll try to investigate more...