[vdr] VDR 1.7.x and unstable DVBT locking on channe (breaks after 60secs)l?

Klaus Schmidinger Klaus.Schmidinger at tvdr.de
Sat Dec 5 13:16:13 CET 2009

On 04.12.2009 09:22, mike n wrote:
> Hello,
> I have been testing the latest VDR 1.7.10 and 1.7.5 versions and both
> have following problem I haven't seen on VDR 1.6.x version.
> The problem is that after starting VDR (with or without OSD GUI
> frontend), it looses a lock on channel after 60 seconds or so.
> If I have local or remote xinelibout GUI watching the live-tv then at
> first picture goes to garbage (lots of blocky artifacts) and after few
> seconds it freezes completely. OSD and VDR itself is still functional,
> but livetv picture is static picture. Or sometimes VDR all in a sudden
> shows a picture from another channel even when I didn't change channel
> (static picture with lots of blocky artifacts). To me it looks like VDR
> changed tuner to another MUX (I have 4 DVBT muxes here or whatever the
> proper term is for those "channel groups") when static picture changes.
> This happens every time when I start VDR. Restart of VDR fixes the
> problem immediatly, but after 60 seconds booom again. When this happens,
> Xineliboutput console shows following text:
>   "no data in 8 seconds. queing no signal image"
> If I use ZAP dvb-apps tool to save a channel output to a tempfile.ts
> file output, it works beatifully all day long. It doesn't loose lock on
> a channel and picture quality is perfect (no artifacts).
> I have tried two different computers and two USB DVBT tuners and the
> problem is the same in all of these, so I assume it is not hardware
> related. It shouldn't be signal related either because ZAP saves perfect
> TS stream output all night long.
> Is there some worker process which kicks in VDR every 60 seconds? Maybe
> EPG related process? For some reason I suspect that VDR starts to scan
> through EPG data even when I'm watching live-tv. This would explain why
> it seems that sometimes it tuned to another mux. When I start VDR, there
> is no cached EPG data file because it goes to TMP folder and tmp is
> cleared everytime machine boots up.
> Environment is as follows
> - Linux kernel
> - DVBT Reddo usb stick and Twinhan DVBT stick tested
> - VDR 1.7.10 and 1.7.5 versions tested
> - Xineliboutput latest CVS version as frontend (doesnt matter even when
> I start VDR in background without GUI frontend. Problem is the same)
> I'm able to code/debug/read source code quite fluently, so I'm happy to
> help debug this if someone could point me to right direction where to
> look for this "60 secs timeout/worker process" issue in VDR.

VDR does start scanning for EPG data after a while if inactivity.
To rule out this one, please set "EPG scan timeout" to 0 in the "Setup/EPG"


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