Opened 5 years ago

Last modified 5 years ago

#12014 new Bug Report - General

DVB-T transport not working properly

Reported by: amlopezalonso@… Owned by: danielk
Priority: minor Milestone: unknown
Component: MythTV - DVB Version: Master Head
Severity: medium Keywords: DVB-T transport
Cc: Ticket locked: no

Description

Hi,

In recent trunk updates one of the DVB-T transports in my MythTV box has ceased to work properly, showing for both two channels in that transport a behavior such as that of a poor quality signal (little or no motion, black screen, some block artifacts, no audio or just some chirping noise, etc.). All other transports do work ok.

I checked both channels work right using a standalone DVB-T tuner hooked to the same cable/antenna socket, etc.

Attaching FE (playback) and BE logs.

Regards, Antonio

Attachments (2)

backend.log (18.4 KB) - added by amlopezalonso@… 5 years ago.
frontend.log (50.4 KB) - added by amlopezalonso@… 5 years ago.

Download all attachments as: .zip

Change History (3)

Changed 5 years ago by amlopezalonso@…

Attachment: backend.log added

Changed 5 years ago by amlopezalonso@…

Attachment: frontend.log added

comment:1 Changed 5 years ago by dan.garton@…

I am seeing the same issue, using a quad-channel DVB-S/S2 tuner (TBS6985). Using mythtv backend 0.27 from mythbuntu repositories, and either mythtv frontend (from same repos) or xbmc (from team-xbmc repo).

For me, as above, the symptoms are: occasional "signal-loss-type" failures, ie block artifacts in video, and squeaks, pops and dropouts in the audio. While this is occurring, this is what I see in mythbackend.log:

Jan 21 17:43:08 jukes mythbackend: mythbackend[3488]: E DVBRead mpeg/mpegstreamdata.cpp:365 (AssemblePSIP) MPEGStream[3](0x7eff40364368): Error: offset>181, pes length & current cannot be queried
Jan 21 17:44:12  mythbackend: last message repeated 17 times
Jan 21 17:45:20  mythbackend: last message repeated 14 times
Jan 21 17:45:49  mythbackend: last message repeated 6 times

Normally, the problem recovers within a minute or so, and the "signal" recovers. Still, it's really annoying and even a few seconds of that effect is enough to ruin a recording.

I have never seen this problem when watching TV directly using a DVB-compatible player, eg Kaffeine etc.

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