TVHEADEND Help For Terrestrial Muxes

lessdrama

Hi
Im new to TVHeadend and looking for a little help.

I have s simple TVheadend setup on a raspberry PI3 with the official raspberry PI DVB-T tuner (Sony). I have created a network and used the predefined mux for Ireland-Truskmore (I'm based in West Mayo).

It creates 2 Muxes at 730Mhz and 762Mhz. However these 2 muxes are created in Pending state and never change. If I force the change to Active state, then the scan fails and it does not find any channels.

I have made sure that the network is assigned to an adapter.


I know the aeriel signal is OK because if I plug the aerial into a generic freeview box and do a blind scan it finds all the channels.

Im not sure what I'm doing wrong. Any help would be appreciated

Thanks.

Johnboy1951

Maybe you are using the old frequencies which were applicable prior to recent changes. Check on line for current frequencies for your transmitter.

Ensure the Network is properly applied to the tuner and the settings saved.

lessdrama

Johnboy1951 wrote: »

Maybe you are not using the old frequencies which were applicable prior to recent changes. Check on line for current frequencies for your transmitter.

Ensure the Network is properly applied to the tuner and the settings saved.

I have checked on the Saorview website and it says I should be using the clifden transmitter (23 and 26) that are not affected by the changes.

The trouble is I dont know how to translate this into MUX settings for TV headend.

I did a blind scan and all muxes failed so a bit lost at this stage.

Many Thanks.

Johnboy1951

lessdrama wrote: »

I have checked on the Saorview website and it says I should be using the clifden transmitter (23 and 26) that are not affected by the changes.

The trouble is I dont know how to translate this into MUX settings for TV headend.

I did a blind scan and all muxes failed so a bit lost at this stage.

Many Thanks.

Which transmitter is your aerial pointed to?

Last page here for frequencies
https://www.2rn.ie/wp-content/uploads/2019/09/2RN-DTT-Television-Transmission-Network-Sept-2019-Rev.1.2.pdf

lessdrama

Hi

I believe its pointed at Clifden.

Thank you for the frequency list. I will try that now.

Thanks.

lessdrama

Hi

I added the 2 muxes but both fail on the scan. The only thing I changed was the frequency. Everything else was set to auto.

Mux1 for Clifden is 514 Mhz
Mux 2 is 490 Mhz.

I can't post a link to an image yet as I'm a new user.

I have treble checked that the aerial is plugged into the pi

Regards.

Johnboy1951

lessdrama wrote: »

Hi

I added the 2 muxes but both fail on the scan. The only thing I changed was the frequency. Everything else was set to auto.

Mux1 for Clifden is 514 Mhz
Mux 2 is 490 Mhz.

I can't post a link to an image yet as I'm a new user.

I have treble checked that the aerial is plugged into the pi

Regards.

On the basis that you have tried all the mux frequencies you think you should .....

Are you sure there is not some problem with the Pi tuner?

I expect you have checked that it is explicitly enabled at

tvheadend - Configuration - DVB Inputs - TV Adapters

lessdrama

Hi

Its a fair question. All I can say is the light is on and dmesg is not thowing up anything obvious. except for the following:

cxd2880: cxd2880_tune: cxd2880_set_frontend failed -22
[ 27.819535] cxd2880: cxd2880_tune: cxd2880_set_frontend failed -22


I have a USB DVB-T adapter so will try that tomorrow and provide an update.

Many Thanks.

lessdrama

Hi

So I dont have a solution yet but I'm documenting what I'm doing for anyone who may read this post later.

I have now 100% confirmed that my aerial is pointed at the cliften transmitter which means its using the muxes at 490Mhz and 514Mhz. I did this by by plugging the areal into my amiko mini combo (which I want to replace with TV headend and Kodi) and doing a blind scan and it found channels on those 2 muxes.

Next I used the w_scan command to do a lowe level scan for channels rather than using TVheadend.

To install w_scan on my pi I did:

sudo apt-get update
sudo apt-get install w-scan

I then stopped the TVheadend service as w_scan and tvheadend cant use the adapter at the same time.

sudo systemctl stop tvheadend

Finally I scanned for channels with the following command:

w_scan -ft -c IE

and sadly it did not find any channels

So at this point, as Johnnyboy1951 suggested, maybe there was a problem with official raspberry pi DVB adapter.

So I removed this from the raspberry Pi and pluuged in an USB based XBOX one dvb adapter (panasonic tuner).

I restarted the PI and saw that dmesg was reporing that it could not find the firmware file so I downloaded the firmware file from

http://palosaari.fi/linux/v4l-dvb/firmware/MN88472/02/latest/

and copied it to /lib/firmware.

I rebooted the Pi again and this time dmesg said

mesg | grep dvb
[ 5.542154] dvb-usb: found a 'Microsoft Xbox One Digital TV Tuner' in cold state, will try to load a firmware
[ 5.564200] dvb-usb: downloading firmware from file 'dvb-usb-dib0700-1.20.fw'
[ 6.237407] dvb-usb: found a 'Microsoft Xbox One Digital TV Tuner' in warm state.
[ 6.238029] dvb-usb: will pass the complete MPEG2 transport stream to the software demuxer.
[ 6.255364] dvbdev: DVB: registering new adapter (Microsoft Xbox One Digital TV Tuner)
[ 6.590017] dvb-usb: Microsoft Xbox One Digital TV Tuner successfully initialized and connected.
[ 6.590363] usbcore: registered new interface driver dvb_usb_dib0700
[ 11.372730] mn88472 3-0018: downloading firmware from file 'dvb-demod-mn88472-02.fw'



Finally I stopped the Tvheadend service again and did another scan


w_scan -ft -c IE
w_scan -ft -c IE
w_scan version 20170107 (compiled for DVB API 5.10)
using settings for IRELAND
Country identifier IE not defined. Using defaults.
scan type TERRESTRIAL, channellist 4
output format vdr-2.0
WARNING: could not guess your codepage. Falling back to 'UTF-8'
output charset 'UTF-8', use -C <charset> to override
Info: using DVB adapter auto detection.
/dev/dvb/adapter0/frontend0 -> TERRESTRIAL "Panasonic MN88472": very good :-))

Using TERRESTRIAL frontend (adapter /dev/dvb/adapter0/frontend0)
-_-_-_-_ Getting frontend capabilities-_-_-_-_
Using DVB API 5.11
frontend 'Panasonic MN88472' supports
DVB-T2
INVERSION_AUTO
QAM_AUTO
TRANSMISSION_MODE_AUTO
GUARD_INTERVAL_AUTO
HIERARCHY_AUTO
FEC_AUTO
BANDWIDTH_AUTO not supported, trying 6/7/8 MHz.
FREQ (42.00MHz ... 870.00MHz)
-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Scanning DVB-T...
Scanning 8MHz frequencies...
474000: (time: 00:00.039)
482000: (time: 00:02.069)
490000: (time: 00:04.109)
498000: (time: 00:06.159)
506000: (time: 00:08.189)
514000: (time: 00:10.239) signal ok: QAM_AUTO f = 514000 kHz I999B8C999D999T999G999Y999 (0:0:0)
Info: no data from PAT after 2 seconds
deleting (QAM_AUTO f = 514000 kHz I999B8C999D999T999G999Y999 (0:0:0))
522000: (time: 00:13.679)
530000: (time: 00:15.709)
538000: (time: 00:17.759)
546000: (time: 00:19.789)
554000: (time: 00:21.839)
562000: (time: 00:23.869)
570000: (time: 00:25.919)
578000: (time: 00:27.949)
586000: (time: 00:29.999)
594000: (time: 00:32.029)
602000: (time: 00:34.079) signal ok: QAM_AUTO f = 602000 kHz I999B8C999D999T999G999Y999 (0:0:0)
Info: no data from PAT after 2 seconds
deleting (QAM_AUTO f = 602000 kHz I999B8C999D999T999G999Y999 (0:0:0))

and then finally

ERROR: Sorry - i couldn't get any working frequency/transponder
Nothing to scan!!
root@raspberrypi:/home/pi#


So it looks like the PI tuner may be faulty but i'm now having some issues with the Xbox One tuner.

Any suggestions would be welcome.

Thanks.

Johnboy1951

It wasn't clear if you had tried tvheadend with the Xbox tuner.
If not, try it using the frequencies w_scan reported that have a signal.

At least the Xbox tuner seems to be seeing a signal on two frequencies.

Is the Pi well supplied with power?
Just wondering if it is a lack of power that is causing the problem.

You could try the Xbox tuner in a powered hub to see if it makes any difference.

EDIT: I get similar results here from a DVB USB tuner where my aerial is almost non-existent, so I did not expect to get any channels ........

666000: (time: 00:57.697) 
674000: (time: 00:59.883)         signal ok:    QAM_AUTO f = 674000 kHz I999B8C999D999T999G999Y999 (0:0:0)
        Info: no data from PAT after 2 seconds
        deleting (QAM_AUTO f = 674000 kHz I999B8C999D999T999G999Y999 (0:0:0))
682000: (time: 01:03.808) 
690000: (time: 01:06.019)         signal ok:    QAM_AUTO f = 690000 kHz I999B8C999D999T999G999Y999 (0:0:0)
        Info: no data from PAT after 2 seconds
        deleting (QAM_AUTO f = 690000 kHz I999B8C999D999T999G999Y999 (0:0:0))
698000: (time: 01:09.630) 


ERROR: Sorry - i couldn't get any working frequency/transponder
 Nothing to scan!!

Are you using the same cable for the Pi as the Amiko?

lessdrama

Hi

Tvheadend did not find any channels.

I rescanned using _w_scan and it did not find any channels either. I am using the same cable just unplugged from the amiko and plugged into the xbox one tuner.

Its possible that I do have a power problem as the supply is 2 amps.

I will upgrade the PSU for the PI to 2.5 amps and get a powered USB hub.

Thanks for all the help so far and I will report back once I have sorted these areas out.

Many Thanks.

Johnboy1951

I don't have a Pi 3 so am unsure about its power requirements, especially if you have devices attached to the basic board.
Possibly both the Xbox tuner and the Pi tuner would each require about 400mA, but that should be checked.

Further thought ....... have you considered testing with a different OS?
LibreELEC with the Tvheadend server addon would be a good test I imagine, using one tuner at a time.

Most likely it will not do all you might want from the Pi, but it would be a good test for the Tvheadend side of things.

lessdrama

Hi

I will give it a try now with libreelec. The Pi is dedicated to tvheadend so not worried about using it for other things.

(its easier to try librelelec than try to to get parts here in the west or Ireland)

Im also going to try it on a Pi2 which has lower power requirements.

I will report back.


Thanks

lessdrama

So I spent a couple of hours testing with different raspberry Pi's using the PI OS

My think is that since I dont have a larger PSU to hand above 2 amps, I could use raspberry pi's that require less amps.

I did not install tvheadend but used w_scan

Unfortunately, the results were the same in that neither tuner found any channels. I cant post images yetm but I tried a PI model B and a PI 2 in addition to the PI3 all with new installs of the PI OS.



I will try with libreelec tomorrow.

dirtchamber79

Hi OP


I had a similar issue a while back, using a Pi4 and a usb dongle.


My issue was drivers in the end.


My thread has all the scanning parameters I needed at the bottom, might be of help to you in TVHeadend with your frequencies.


Thread is here: https://www.boards.ie/vbulletin/showthread.php?t=2058094563