Transponder Error and Continuity Errors making my video stream useless

stefan ott

Hi everyone,

I am getting lots of Transponder Error and Continuity Errors ( 28000 and more)when both tuners are active.. impact is: when i stream 1 channel i get loads of artifacts in my stream .. up to completely messed up video.. or more a still picture with 3 colors..

both tuners should work i guess according to linuxtv org /wiki/index.php/Hauppauge_WinTV-dualHD

when i turn one off i just get little numbers (like 23) in the errors.. which has no impact on the streamed video

i experienced this mainly on the low frequencies like 180-230 Mhz .. but also happened on the higher ones ..

another guy with the same stick/tuner showed me he is running 4 streams on lower freqiencies withou any errors..

so what might be wrong with my setup?

oh.. here is my dmesg from my system if that helps

pastebin pl /view/24cb1c3b

Tuner:
Hauppauge WinTV-dualHD 01590
Transfer Mode set to bulk

fimrware dvb-demod-si2168-b40-01.fw version 4.0.25

Client:
dream Player TV for TVheadend (Beta), Version 5.5.1 for Android TV

on a nVidia Shield TV Pro (2015) with SW Version 9.0.1

Server
TVHeadend Build: 4.3-2010~g3b1d7a928 (2022-03-15T10:50:53+0000)
on Ubuntu 20.04.4 LTS Desktop
on an Lenovo Thinkpad T450S

stefan ott

no idea folks? :(

davep

You seem to have several USB devices on your system. How are they connected and how are they powered?

Your tuner has its transfer mode set to 'bulk'. Is this the default for this device or did you change it? If you changed it, how was the performance in Isochronous mode?

stefan ott

No, i have only 1 USB device attached: the tuner.(see attached pic)

it is powered by the usb port.

Else there is only the power-cord and a rj45 for the network attached.

the default transfer mode seams to be isochronous.
i changed it based on the documentation here to bulk: linuxtv org /wiki/index.php/Hauppauge_WinTV-dualHD
my observations say: the errors dropped down to 10% (about 3500 from previously 35000)
but there are still lots of errors on the tuners when i have both enabled.
disabling the "second" tuner, eliminates almost all errors

Saen Acro

Try withpowertop optimisation
Do not optimise anything with includeUSB in name

stefan ott

sorry, i did not get that ..
what do i do where?

Saen Acro

Runpowertop there is tab "Tunables"

optimise all nonUSB devices

https://www.phoronix.net/image.php?id=2016&image=powertop_2016_1_med

stefan ott

interesting tool +1

optimized everything except 4 entries that mentioned USB

side question: this optimization needs to be redone after a reboot, right?

however, seams not to help :(

!Capture.PNG!

Saen Acro

Check cables where signal come from.

If you have some amplifier, it can be one with generate noises.

----

Post links as links do not edit them /censorship is not needed/

What is signal type DVB-C or DVB-T?

stefan ott

cables should be fine:
- i live in a newly build home (3 years old now)
- cable goes straight from wall to tuner - no amplifiers

- using a high quality thick shielded cable

it is DVB-C
disabled DVB-T

the one with "OFF" in the name is just a reminder for me, so i know which one to disable, so i can use the setup at all

!Capture.PNG!

thank you for the hint with the links :)

stefan ott

hmmm.. looks like the optimizations in powertop are also putting my laptop to sleep now after a while :(
did e reboot .. but still happening :(

stefan ott

help