Tvheadend

What is hardware running TVH?

• AMD Ryzen 3 3200G - 4GHz/6Mo/AM4 CPU
• MSI B450M-A PRO MAX - B450/AM4/DDR4/mATX motherboard
• Ballistix BL8G30C15U4B (8GB DDR4 3000 PC24000) OEM RAM

Try disable embedded sound card (guess realtek )

Hi,

I went into the BIOS and disabled "HD Audio Controller" (in a screen similar to this one).

Unfortunately, this did not solve the continuity errors:

log_20200715.txt . Do not pay attention to the "no input source available", tonight I had 3 (automatically) scheduled recording for only one tuner.

Thanks

Hello,

• installing VDR PVR backend + frontend under LibreElec: it seems like I do not get these errors, even after a long playback (I could not find any log or web interface, so I just noticed that visually).
• reverted TVH to the "stable" version (4.2.8-36) under LibreElec 9.2.3: but the same errors occurred after ~30 minutes playback.

Attached is a low level debug_sample.txt: 10000 lines for less than 1 minute, but still a lot of continuity errors.

do you try to use

femon
dvb-fe-tool

I have same tuner used for weeks no problem.

As I read you have signal ampliffier can you reduce power level.

Hello,
Thank you very much for your help.

I just ran:
femon -H -a1 > femon1.txt

Then I lowered the amplifier UHF level to the middle position (it was at about 2/3).

femon -H -a1 > femon2.txt

dvb-fe-tool -a1 --femon -v: saved to dvb-fe-tool.txt

I let it run a bit longer, and apparently the TVHeadend errors are synchronized with "Poor Quality" lines in dvb-de-tool:

Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 30.98dB UCB= 56158707 postBER= 674x10^-9 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.03dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.15dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.13dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.19dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.07dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 30.95dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -38.00dBm C/N= 31.03dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.03dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.18dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.13dB UCB= 56158707 postBER= 0 PER= 0
Lock (0x1f) Quality= Poor Signal= -37.00dBm C/N= 31.36dB UCB= 56158751 postBER= 93.1x10^-6 PER= 2.20x10^-3
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.14dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.27dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.17dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.27dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.02dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.38dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.17dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -38.00dBm C/N= 30.96dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.25dB UCB= 56158773 postBER= 0 PER= 0
Lock (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.06dB UCB= 56158773 postBER= 0 PER= 0

and after a long time:

Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.02dB UCB= 56159233 postBER= 0 PER= 0
Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 30.92dB UCB= 56159233 postBER= 0 PER= 0
Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.10dB UCB= 56159233 postBER= 0 PER= 0
Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 30.92dB UCB= 56159233 postBER= 0 PER= 0
Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 31.07dB UCB= 56159233 postBER= 0 PER= 0
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 30.80dB UCB= 56159317 postBER= 110x10^-6 PER= 2.80x10^-3
Lock   (0x1f) Quality= Good Signal= -37.00dBm C/N= 30.81dB UCB= 56159317 postBER= 0 PER= 0
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.83dB UCB= 56161117 postBER= 2.42x10^-3 PER= 60.0x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 30.86dB UCB= 56161954 postBER= 318x10^-6 PER= 7.90x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.70dB UCB= 56162677 postBER= 961x10^-6 PER= 24.1x10^-3
Lock   (0x1f) Quality= Good Signal= -38.00dBm C/N= 31.01dB UCB= 56162677 postBER= 0 PER= 0
Lock   (0x1f) Quality= Poor Signal= -38.00dBm C/N= 29.39dB UCB= 56164210 postBER= 2.07x10^-3 PER= 51.1x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.99dB UCB= 56166370 postBER= 2.87x10^-3 PER= 72.0x10^-3
Viterbi(0x07) Quality= Poor Signal= -37.00dBm C/N= 31.02dB UCB= 56166699 postBER= 666x10^-6 PER= 16.5x10^-3
Got parameters for DVBT:
FREQUENCY = 522000000
MODULATION = QAM/64
BANDWIDTH_HZ = 8000000
INVERSION = OFF
CODE_RATE_HP = 3/4
CODE_RATE_LP = 1/2
GUARD_INTERVAL = 1/8
TRANSMISSION_MODE = 8K
HIERARCHY = NONE
DELIVERY_SYSTEM = DVBT
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.11dB UCB= 56169384 postBER= 3.31x10^-3 PER= 82.7x10^-3
Lock   (0x1f) Quality= Poor Signal= -38.00dBm C/N= 29.28dB UCB= 56171100 postBER= 2.30x10^-3 PER= 57.2x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.26dB UCB= 56173713 postBER= 2.55x10^-3 PER= 63.4x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 28.99dB UCB= 56175735 postBER= 2.72x10^-3 PER= 67.4x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.11dB UCB= 56177631 postBER= 2.53x10^-3 PER= 63.2x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.27dB UCB= 56180366 postBER= 2.76x10^-3 PER= 68.9x10^-3
Viterbi(0x07) Quality= Poor Signal= -37.00dBm C/N= 29.32dB UCB= 56181678 postBER= 2.63x10^-3 PER= 65.6x10^-3
Got parameters for DVBT:
FREQUENCY = 522000000
MODULATION = QAM/64
BANDWIDTH_HZ = 8000000
INVERSION = OFF
CODE_RATE_HP = 3/4
CODE_RATE_LP = 1/2
GUARD_INTERVAL = 1/8
TRANSMISSION_MODE = 8K
HIERARCHY = NONE
DELIVERY_SYSTEM = DVBT
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.55dB UCB= 56183487 postBER= 2.42x10^-3 PER= 60.3x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.20dB UCB= 56186533 postBER= 2.98x10^-3 PER= 74.6x10^-3
Lock   (0x1f) Quality= Poor Signal= -38.00dBm C/N= 29.41dB UCB= 56188246 postBER= 2.30x10^-3 PER= 57.1x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.16dB UCB= 56190289 postBER= 2.74x10^-3 PER= 68.1x10^-3
Lock   (0x1f) Quality= Poor Signal= -37.00dBm C/N= 29.16dB UCB= 56193137 postBER= 2.97x10^-3 PER= 74.3x10^-3

You have all time UCB Un Corrected Bits
compare mine

# dvb-fe-tool --femon -v -a1
Device Afatech AF9033 (DVB-T) (/dev/dvb/adapter1/frontend0) capabilities:
     CAN_FEC_1_2
     CAN_FEC_2_3
     CAN_FEC_3_4
     CAN_FEC_5_6
     CAN_FEC_7_8
     CAN_FEC_AUTO
     CAN_GUARD_INTERVAL_AUTO
     CAN_HIERARCHY_AUTO
     CAN_INVERSION_AUTO
     CAN_MUTE_TS
     CAN_QAM_16
     CAN_QAM_64
     CAN_QAM_AUTO
     CAN_QPSK
     CAN_RECOVER
     CAN_TRANSMISSION_MODE_AUTO
DVB API Version 5.11, Current v5 delivery system: DVBT
Supported delivery system:
    [DVBT]
Got parameters for DVBT:
FREQUENCY = 626000000
MODULATION = QAM/64
BANDWIDTH_HZ = 8000000
INVERSION = AUTO
CODE_RATE_HP = 2/3
CODE_RATE_LP = 1/2
GUARD_INTERVAL = 1/4
TRANSMISSION_MODE = 8K
HIERARCHY = NONE
DELIVERY_SYSTEM = DVBT
Lock   (0x1f) Signal= 59,01% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,22% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,23% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,15% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,28% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 58,76% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,13% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,08% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,08% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,12% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 59,01% C/N= 0,00% UCB= 0 postBER= 0
Lock   (0x1f) Signal= 58,94% C/N= 0,00% UCB= 0 postBER= 0

You have signal problem, not software or hardware problem.

• The "poor signal" messages only occur after ~20 minutes, and go away if I restart the tuning.
• The same channel works fine on my TV either with the same antenna cable, or with another cable from the same amplifier even when the signal is poor on the PC.
• It used to work fine on my previous setup with an Hauppauge WinTV Nova-T-500 PCI card (but I do not have any PCI slot on my new motherboard!)

Don't you think it might also be an USB tuner or driver or OS or cable problem? I am going to test all that.
All my tests were performed on the most "difficult" multiplex, for which the signal is the weakest.
For example, here is what it gives on a "stronger" multiplex: dvb-fe-tool-594MHz.txt . No UCB, but still some postBER. The C/N switches between 28 and 67 dB...

• check with other cables (with and without amplifier)
• VDR PVR + dvb-fe-tool (to see if it is TVH related)
• Another laptop under Linux Mint with the same tuner
• Buy another TV tuner

Thanks again

I my case i use antena with come with tuner.
Transmiter is 20km away and no problems except havy raining and thunder storms.

Good to know, thanks. Here I am in an old building with big walls, and the reception is supposed to be good, so I still want to investigate.

If you can turn down the amplifier even more try that, if you go in with a too strong signal there will be distortions. So amplifiers are not always good, if the signal is too strong it's like someone shouting in your ear: It hurts and you won't understand anything.

Sébastien Aubry wrote:

Good to know, thanks. Here I am in an old building with big walls, and the reception is supposed to be good, so I still want to investigate.

Are you shure that there is no other amplifier, before yours in building, after master antenna?

Yes, there may be one. Mine is an indoor amplifier, I am not sure that it is necessary, I have bought it because I thought it might improve the signal. I will try with a direct cable between the PC and the plug, without the amplifier.
Thanks

Sébastien Aubry wrote:

Yes, there may be one. Mine is an indoor amplifier, I am not sure that it is necessary, I have bought it because I thought it might improve the signal. I will try with a direct cable between the PC and the plug, without the amplifier.
Thanks

My guessing someone not pointed antenna good put amplifier boost it to max and there was "acceptable signal" and he leave it.
But antenna can move from wind snow birds etc.
Without spectral analyser cannot be done correct measurement.

Why don’t you try a different Linux distribution to LibreELEC with all the same hardware and signal/cables? Rules out the OS and may save you buying new hardware.

We have the same manufacture USB tuner and appear to have the same issue here: https://tvheadend.org/boards/5/topics/42007?r=42110#message-42110

The Linux distro switch worked for me. I’ve had zero failed recordings since ditching LibreELEC.

Brent McArthur wrote:

Why don’t you try a different Linux distribution to LibreELEC with all the same hardware and signal/cables? Rules out the OS and may save you buying new hardware.

We have the same manufacture USB tuner and appear to have the same issue here: https://tvheadend.org/boards/5/topics/42007?r=42110#message-42110

The Linux distro switch worked for me. I’ve had zero failed recordings since ditching LibreELEC.

Hello,
I have tried to begin the tests with your advice: I installed TVHeadend on an old laptop under Linux Mint and moved the same tuner/cable to this PC.
I used the command: dvb-fe-tool --femon -v -c 2500 -a0 2>&1 | awk '{ print strftime("%Y-%m-%d %H:%M:%S"), $0; fflush(); }' | tee log.txt in order to timestamp each line and to get the error output in the log file.

So far, it seems to me that this would be a software or hardware problem:

[edit] see table in the first post

I can provide the log or any details if you want to have a look.
Thank you all for your help.

Kernel and module version needed in table ;)
Try OpenElec, or AlexElec from were all other forked

Ok, I will now add the kernel version [edit: done in the table above]. What do you mean by "module version"? Is it the TVHeadend version?
Thanks

Just performed a test using VDR instead of TVHeadend, but the result was about the same.

Sébastien Aubry wrote:

Ok, I will now add the kernel version [edit: done in the table above]. What do you mean by "module version"? Is it the TVHeadend version?
Thanks

example

#lsusb -t
/:  Bus 05.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 04.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
/:  Bus 03.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 2: Dev 2, If 1, Class=Human Interface Device, Driver=usbhid, 1.5M
    |__ Port 2: Dev 2, If 2, Class=Human Interface Device, Driver=usbhid, 1.5M
/:  Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M
    |__ Port 2: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M
/:  Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/8p, 480M
    |__ Port 1: Dev 2, If 0, Class=Hub, Driver=hub/4p, 480M
        |__ Port 1: Dev 9, If 0, Class=Vendor Specific Class, Driver=dvb_usb_af9035, 480M    <<<<<<<
        |__ Port 4: Dev 11, If 0, Class=Vendor Specific Class, Driver=dvb_usb_dibusb_mc, 480M
    |__ Port 6: Dev 7, If 0, Class=Mass Storage, Driver=usb-storage, 480M
    |__ Port 8: Dev 10, If 1, Class=Video, Driver=uvcvideo, 480M
    |__ Port 8: Dev 10, If 0, Class=Video, Driver=uvcvideo, 480M

where take info for dvb_usb_af9035

# modinfo dvb_usb_af9035
filename:       /lib/modules/5.3.0-62-generic/kernel/drivers/media/usb/dvb-usb-v2/dvb-usb-af9035.ko
firmware:       dvb-usb-it9303-01.fw
firmware:       dvb-usb-it9135-02.fw
firmware:       dvb-usb-it9135-01.fw
firmware:       dvb-usb-af9035-02.fw
license:        GPL
description:    Afatech AF9035 driver
author:         Antti Palosaari <[email protected]>
srcversion:     5542A650CE8CA3581F49803
alias:          usb:v07CAp1871d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v048Dp9306d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v2013p0262d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v2013p025Ad*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v2040pF900d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0413p6A05d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0CCDp0099d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0CCDp10AEd*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v1B80pE410d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v1B80pE411d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v1B80pE409d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp0335d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CApA110d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp4835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp3835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp2835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp1835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v048Dp9006d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v048Dp9005d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v048Dp9135d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v1F4DpA115d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp0337d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0CCDp00AAd*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0B05p1779d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp0825d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CApA867d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CAp1867d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CApB835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v07CApA835d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v0CCDp0093d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v15A4p1003d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v15A4p1002d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v15A4p1001d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v15A4p1000d*dc*dsc*dp*ic*isc*ip*in*
alias:          usb:v15A4p9035d*dc*dsc*dp*ic*isc*ip*in*
depends:        dvb_usb_v2,rc-core
retpoline:      Y
intree:         Y
name:           dvb_usb_af9035
vermagic:       5.3.0-62-generic SMP mod_unload
signat:         PKCS#7
signer:
sig_key:
sig_hashalgo:   md4
parm:           adapter_nr:DVB adapter numbers (array of short)

Ok. Do you need all the output of modinfo? The version number is the same as the kernel (5.1.16 for LibreELEC): modinfo_libreelec.txt modinfo_mint.txt
Thanks

If module is from kernel is equal if separately build is not.