Many data errors after about 15 minutes, restarting stops the errors

Sébastien Aubry · 2020-07-15T11:41:49+00:00

Hello, I have some signal noise problems using an USB DVB-T tuner AVerMedia AVerTV Volar hd2 (seen as Afatech AF9033 in TVHeadend). When I plug the antenna...

Saen Acro

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

Sébastien Aubry

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

Sébastien Aubry

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

Saen Acro

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 <crope@iki.fi>
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)

Sébastien Aubry

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

Saen Acro

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

Sébastien Aubry

Hello,

I have performed a new test: I ran Linux Mint with an older kernel (older than LibreELEC's one), and let the test run all the night. There was no error:

| 23/07/20 00:07 |Laptop |Linux Mint 19.3 |5.0.0-32 |5.0.0-32 | TVHeadend | yes | 50% | pink+blue | 21000 | 0 | 0 | |

About OpenELEC or AlexELEC, can I use them without installing them? I would like not to lose my LibreELEC installation. Else, can I just use a live USB distribution and install TVHeadend on it?

Thank you for your advice.

Saen Acro

Sébastien Aubry wrote:
> About OpenELEC or AlexELEC, can I use them without installing them? I would like not to lose my LibreELEC installation. Else, can I just use a live USB distribution and install TVHeadend on it?
>

> Thank you for your advice.

install it on usb drive
<<

Brent McArthur

Glad to hear you’ve found a combo with no errors!

I did not try OpenELEC or AlexELEC, but until we find out what is driving the errors in LibreELEC my guess is high risk these distributions will have the same issue given they are in the same family. Give it a go, but you may need to fall back to a more generic Debian based distribution to avoid errors.

What is it in the LibreELEC install that you don’t want to lose? If it’s Kodi there are relatively easy ways to backup/restore your Kodi catalogue & setup between machines or distributions.

I’m still curious as to what is the root cause. I tried downgrading to multiple earlier versions of LibreELEC which in turn downgrades the kernel version as well. But I was unable to find an LibreELEC/Kernal combo that didn’t produce the errors.

Sébastien Aubry

saen acro wrote:

> install it on usb drive

Hello,
I have installed OpenELEC on an USB key. It is quite slow but it works.
I could not find TVHeadend backend in the repositories (it seems to have been removed), so I installed VDR.
But I cannot find the dvb-tools add-on and the dvb-fe-tool program, in order to monitor the signal quality. I looked for them but it does not seem obvious. Any idea?
Thanks

Sébastien Aubry

Hello,
I managed to monitor the signal quality under OpenELEC using Kodi: I enabled "Show signal quality" and pressed "o" in order to display the PVR info.
The counter works, because on my first run, it used to show some uncorrected blocks (but I think this is usual when scanning for the channel frequencies).

After rebooting (and plugging the USB key on an USB3 port - much faster!), I was able to run live TV without any error, for more than one hour now:

!{width:400px}openelec.jpeg!

| 24/07/20 12:10 |HTPC |OpenELEC 8.0.4 |4.9.30 |4.9.30 |VDR | yes | 50% | pink+blue | 13800 | 0 | 0 | |

I will leave it a few more hours, but this seems to work fine. [edit: it has been working for ~4 hours]

Sébastien Aubry

I just bought a new (dual) USB tuner: Hauppauge WinTV-dualHD. As expected, it seems to work without any problem:

|_.Start time |_.Hardware |_.OS |_.Kernel |_.TV tuner|_.DVB Module |_.PVR |_.Amplifier ? |_.Amplifier level |_.Cables |_.Duration (s) |_.Poor signal count (s) |_.UCB (uncorrected blocks) |_.First UCB at (s) |
| %{color:green}24/07/20 16:47% | HTPC | LibreElec 9.2.3 | 5.1.16 |Hauppauge WinTV-dualHD |em28xx 5.1.16 |TVHeadend | yes | 50% | pink+green | 2500 | 0 | 0 | |

Saen Acro

Brent McArthur wrote:
> Glad to hear you’ve found a combo with no errors!
>

> I did not try OpenELEC or AlexELEC, but until we find out what is driving the errors in LibreELEC my guess is high risk these distributions will have the same issue given they are in the same family. Give it a go, but you may need to fall back to a more generic Debian based distribution to avoid errors.

Its not correct because all have some specific patches drivers etc
When I use AlexElec there is no Open or LibreElec

They come when author start to ask money for new versions

Sébastien Aubry what is in your scenario


pink+ green

cables???

Sébastien Aubry

Yes, I put a different color on each cable in order to identify them. I have 2 cables: one from the wall to the amplifier and one from the amplifier to the USB tuner.

Sébastien Aubry

Hello,

After a few days, I confirm this is probably not a signal problem: with the new Hauppauge dual tuner, I don't get any error. With the AverMedia, I always get some. For instance, tonight I am recording 7 programs, 2 of them with the AverMedia:

!tvh_20200727.jpg!

This is more likely a problem due to a combination of LibreElec/kernel version/driver/tuner/hardware.

Brent McArthur

> This is more likely a problem due to a combination of LibreElec/kernel version/driver/tuner/hardware.

Yes agree. Consistent with the the results I found as well. Feels unlikely a fix will come any time soon given volumes of users impacted trying to do TvHeadend/LibreELEC/AVerMedia Afatech AF9033 is low.

So to help anyone else that may experience this same issue are we saying the 2 possible workarounds are
* Buy new TV Tuner that isn't from AVerMedia; or
* Try another Linux distribution other than LibreELEC - (Linux Mint | Raspbian confirmed to work with AVerMedia tuner/TvHeadend)
?

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