[mythtv-users] Mythtv refuses to set channel on second input

[Michael T. Dean]

On 08/04/2012 04:13 PM, DG Mailing List wrote:
> I've been fighting with a problem for some weeks now and I'm really 
> hoping someone can help.
>
> When I upgraded my MythTV box from 0.24 to 0.25 (and even after I 
> attempted to upgrade to 0.26 and then did a clean reinstall of 0.25) I 
> am unable to successfully change input source on my quad input 
> (TBS6984) card.   I doubt the card is faulty as I can use mplayer and 
> szap-s2 to watch a channel.
>
> The problem is almost certainly a backend problem as it occurs 
> regardless of whether I use a local or remote frontend.  Debugging on 
> the backend produces the following when I try to change to input 2  
> (when logged with /usr/bin/mythbackend --syslog local7 --user mythtv 
> --verbose channel,chanscan)
>
>
> 2012-08-05 07:49:10.984104 I  ChannelBase(27): Looking for 
> startchannel '301' on input 'DVBInput'
> 2012-08-05 07:49:10.986499 I  ChannelBase(27): Found startchannel 
> '301' on input 'DVBInput'
> 2012-08-05 07:49:10.986516 I  TVRec(27): HW Tuner: 27->27
> 2012-08-05 07:49:10.998797 I  DVBChan(27:/dev/dvb/adapter2/frontend0): 
> Opening DVB channel
> 2012-08-05 07:49:10.998810 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301):
> 2012-08-05 07:49:11.001345 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301): failure
> 2012-08-05 07:49:11.001359 E  TVRec(27): Failed to set channel to 301. 
> Reverting to kState_None
> 2012-08-05 07:49:11.001385 I  TVRec(27): Changing from WatchingLiveTV 
> to None
>
> Similarly I noticed on startup with the following  
> /usr/bin/mythbackend --syslog local7 --user mythtv --verbose 
> channel,database,decode,dsmcc,dvbcam,general
>
> 2012-08-05 08:07:45.783777 I  TVRec(27): Start channel: 301.
> 2012-08-05 08:07:45.970814 I  DVBChan(27:/dev/dvb/adapter2/frontend0): 
> Opening DVB channel
> 2012-08-05 08:07:45.972537 I  DiSEqCDevTree: Changing LNB voltage to 18V
> 2012-08-05 08:07:46.972814 I  DiSEqCDevTree: Resetting DiSEqC Bus
> 2012-08-05 08:07:46.972836 I  DiSEqCDevTree: Sending DiSEqC Command: 
> e0  0  0
> 2012-08-05 08:07:47.319990 I  ChannelBase(27): Input #20: 'DVBInput' 
> schan(301) sourceid(4) ccid(27)
> 2012-08-05 08:07:47.320006 I  ChannelBase(27): Current Input #20: 
> 'DVBInput'
> 2012-08-05 08:07:47.320388 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301):
> 2012-08-05 08:07:47.321572 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301): failure
> 2012-08-05 08:07:47.321587 I  ChannelBase(27): Looking for 
> startchannel '301' on input 'DVBInput'
> 2012-08-05 08:07:47.322633 I  ChannelBase(27): Found startchannel 
> '301' on input 'DVBInput'
> 2012-08-05 08:07:47.322869 I  Database connection created: DBManager4
> 2012-08-05 08:07:47.322887 I  New DB connection, total: 4
> 2012-08-05 08:07:47.323350 I  Connected to database 'mythconverg' at 
> host: 10.0.3.251
> 2012-08-05 08:07:47.325124 I  TVRec(28): Start channel: 301.
> 2012-08-05 08:07:47.325186 I  DVBChan(28:/dev/dvb/adapter2/frontend0): 
> Opening DVB channel
> 2012-08-05 08:07:47.325196 I  DVBChan(27:/dev/dvb/adapter2/frontend0): 
> Opening DVB channel
> 2012-08-05 08:07:47.326206 I  ChannelBase(28): Input #21: 'DVBInput' 
> schan(301) sourceid(4) ccid(28)
> 2012-08-05 08:07:47.326217 I  ChannelBase(28): Current Input #21: 
> 'DVBInput'
> 2012-08-05 08:07:47.326438 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301):
> 2012-08-05 08:07:47.327344 I  DTVChan(/dev/dvb/adapter2/frontend0): 
> SetChannelByString(301): failure
> 2012-08-05 08:07:47.327357 I  ChannelBase(28): Looking for 
> startchannel '301' on input 'DVBInput'
> 2012-08-05 08:07:47.328323 I  ChannelBase(28): Found startchannel 
> '301' on input 'DVBInput'
>
>
>
> When I debug with --verbose all, I get a screed of information which 
> is difficult to parse, but it seems to show the following when I 
> change the input:
>
> Aug  5 08:02:21 mythbox mythbackend[3568]: I ProcessRequest 
> mythsocket.cpp:671 (readStringList) MythSocket(d2b3a0:60): read <- 60 
> 34      QUERY_RECORDER 27[]:[]IS_RECORDING
> Aug  5 08:02:21 mythbox mythbackend[3568]: I ProcessRequest 
> mythsocket.cpp:345 (writeStringList) MythSocket(d2b3a0:60): write -> 
> 60 1       0
> Aug  5 08:02:21 mythbox mythbackend[3568]: I ProcessRequest 
> mythsocket.cpp:671 (readStringList) MythSocket(d2b3a0:60): read <- 60 
> 34      QUERY_RECORDER 27[]:[]IS_RECORDING
>
> I am certain that MythTV is not recording anything.
>
> Any help would be very much appreciated.

There was an issue like this fixed a while after release.  Are you using 
0.25-fixes?

mythbackend --version

Mike