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Temporary Distortions

Added by Scott Mayor about 12 years ago

Hi, Ever since i got TVheadend on ubuntu server and the plugin on xbmcbuntu Eden, I have had constant distortions every 30 mins or so for about a minute (on every channel I have cam across). It would be accompanied by disturbing squeak sounds and blocky / pixelation, it would also Pause / Buff etc. etc. My adapter is HVR-1700 which is supposedly well supported in linux, I also have a GB lan which streams 14GB HD files flawlessly, so i can rule that out. Only today i decided to use the coaxial cable running from the tv (which never showed these symptoms) to the pci-e card, as i thought maybe the other cable was dodgy. But this turned out to be false. I have run out off ideas, and although i am tempted to test with another backend software like mythtv, it is something i would like to avoid for the time being.

Here is a link to the output from Tvheadend [url]http://pastebin.com/dHSSyKEi[/url]

Also to note: Under Adapter->Multiplexes every thing shows 100% quality. BUT if i did Monitor signal quality, It would slowly degrade to 0% and also caused issues in trying too access the channels...

EDIT: Also forgot too mention which is kind of off topic, but while i had vaapi enabled, xbmc would crash and restart after these symptoms had arisen, which left me too no choice but to turn off vaapi (this in itself is annoying considering HD movies wont work without it) and use software rendering. I also couldn't use a patched version off vaapi that was discussed somewhere that I cant remember as it wouldn't allow de-interlacing which was really needed aswell....

For now any help for any off these will be great, thanks

NOTE: THE ABOVE WAS COPIED AND PASTED FROM XBMC FORUM TOO HERE
I also had issues with your signup page, it turns out that browsers interpret the captcha as cross site scripting and will block it without the user noticing.


Replies (4)

RE: Temporary Distortions - Added by Adam Sutton about 12 years ago

Ah, sorry I missed this when I scanned my emails.

With regard to the signal quality issue this is known to happen on some cards and I'm not totally convinced the algorithm doesn't have some issues. Personally I've stopped enabling it on my system.

A couple of Qs (some repeated on XBMC forums):

1. Which version is this (git commit'ish if not a release)
2. Have you tried recording content and playing back in VLC?

Adam

RE: Temporary Distortions - Added by Scott Mayor about 12 years ago

Thanks Adam, for getting back too me

I am currently using 3.0 from the deb file... So I loaded up VLC and did network stream to TVHeadend. This resulted in minor Transport / Continuity Errors. Is this still normal? Although it was just random and it seemed to only happen when i was actively doing something on the computer. I then had xbmc access the same channel @13:28:18 then around @14:23:05 both xmbc and vlc were being affected with those symptoms and the log shows alot off duplicate entries etc. As im typing this a few glitch effects were popping up (even with xbmc unsubscribed), I did a small recording and that too shows the same symptoms when played back (VLC was also still runnning)... NOTE: VLC was running on my main computer (win 7), Xbmc is running on a htpc (XBMCBuntu) and tvheadend is running on the Ubuntu Server.. So there was no 2 things running on the same machine.

Here is the latest output http://pastebin.com/ZzYzKQ4q

Just too note. xbmc was running @13:28:18 alongside vlc then i stopped xbmc @14:25:19 (Just as a bunch off continuously Errors popped up and it was glitching). Then I started 1 recording @16:24:24 and another @16:26:17... Yet vlc doesnt seem too struggle as much as xbmc, but it still shows noticeable effects.

Also should I try 3.2?

RE: Temporary Distortions - Added by Adam Sutton about 12 years ago

Small numbers of CC errors are to be expected, they generally mean some data was missed (this can happen for several reasons). To a certain extent the same goes for transport errors, this means it got a packet but something was possibly wrong with it.

However if you're getting lots of such errors it either indicates signal problems or something in the system. Possibly if this is related to load on the machine there is a problem with the timeliness of TVH in reading data from the card? Keep an eye on CPU load (though that won't necessarily tell you the full story).

Adam

RE: Temporary Distortions - Added by Scott Mayor about 12 years ago

On 2 cores I get about 2% load consistently even when it starts playing up.... So yh i dont know, I also had problems with Mythtv trying to get working so i could test on that. only thing left is try a newer version, or blame the signal, but I wouldn't know how I could test that.

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