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HD streams show artefacts

Added by Rainer Dorsch almost 9 years ago

Hi,

I have a cubox-i with a PCTV 461e (DVB-S2) and openelec 6.0 with tvheadend 4.0.8. When I view a HD stream, it has artefacts (maybe very 10-15 seconds for a short moment).

An example artefact is shown here:

http://netcup.bokomoko.de/~rd/vlcsnap_tvheadend_artefact.png

When I record the stream (w/o viewing it) and view it afterwards the artefacts are there as well. When I view the recorded file with vlc on a PC, the artefacts are there and repro exactly at the same position each time I view it. This implies for me that the recording is alreading broken.

The reported signal quality is 100% or sometimes very close to 100%

Any hint is welcome.

Thanks
Rainer


Replies (3)

RE: HD streams show artefacts - Added by Andy Furniss almost 9 years ago

You could try spinning up you cpu(s) with

nice -19 dd if=/dev/urandom of=/dev/null

If you have multiple cores maybe start more than one.

I have a couple of DVB-T2 PCTV sticks and got some usb/power save/xhci issues on my h/w.

Above would mostly fix. Rather than do that I found that the issue was far less if I disabled USB3 in bios to avoid using the xhci driver.

Of course your issue may be totally different - but it's worth a try.

Your symptoms do point to ts packet loss - which I know from my experience can be at usb level. There are posts on here from the past where people with PCIE cards also had to do similar.

RE: HD streams show artefacts - Added by Rainer Dorsch almost 9 years ago

This did not help.

I found in /storage/.kodi/userdata/addon_data/service.multimedia.tvheadend/service.log these entries:

2016-01-17 22:38:55.142 [WARNING] eit: invalid checksum (len 615, errors 77)
2016-01-17 22:39:27.703 [WARNING] eit: invalid checksum (len 412, errors 78)
2016-01-17 22:39:57.151 [WARNING] eit: invalid checksum (len 684, errors 79)
2016-01-17 22:40:08.199 [WARNING] eit: invalid checksum (len 2355, errors 80)
2016-01-17 22:40:22.070 [WARNING] eit: invalid checksum (len 91, errors 82)
2016-01-17 22:40:50.616 [WARNING] eit: invalid checksum (len 3163, errors 84)
2016-01-17 22:41:09.110 [WARNING] eit: invalid checksum (len 3229, errors 85)

Are they related to the issue I see?

I was searching for continuity error, but did not find them. In which file would they be logged?

Thanks
Rainer

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