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[JoseO <1333207@xxxxxxxxxxxxxxxxxx>]

Although right now I'm not able to reproduce this bug, I'm attaching an
output example in which the difference of signal strenght between
consecutive tunings is noticeable. When the bug appears, in the cases
with high signal strength, UNC rate is very high, and in the case of low
signal strength, UNC does not occur.

** Description changed:

- Since updated to 3.2.0-64, tuning of some dvb-t channels produces bad
- MPEG streams randomly. Consecutively tuning several times to the same
- channel results in 1/2 of the time channel lock with almost 0 UNC and
- 1/2 of the time with high rates of UNC. That second scenario makes the
- mpeg stream unwatchable (even no output in dvr0 most of the time)
+ Tuning of some dvb-t channels produces bad MPEG streams pseudo-randomly.
  
- When booting to 3.2.0-58 the same sequence produces correct MPEG streams
- and 0 UNC values all of the time.
+ Consecutively tuning several times to the same channel results in 1/2 of
+ the time channel lock with almost 0 UNC and 1/2 of the time with high
+ rates of UNC. That second scenario makes the mpeg stream unwatchable
+ (even no output in dvr0 most of the time)
+ 
+ A sequence of "tzap -r channel_name" results in a cycle of OK/KO tuning results. After an "OK" tuning (no BER, no UNC, signal level aprox 0x6600)
+ I always get a "KO" tuning (high BER, high UNC, signal level aprox 0x7700)
+ 
+ Note that "pseudo-randomly" means that sometimes it doesn't happen at
+ all but, when it happens, you always get the 50%-50% KO-OK sequence.
+ Unfortunatelly, I'm not able to reproduce it on demand, it depends on
+ some unknown conditions.
  
  Additional information:
  
- Channel example (this specific channel -Spain DVB-T-, in my case, makes
- the problem reproducible 100% of the time) from channels.conf
+ Channel example (this specific channel -Spain DVB-T- in channels.conf
+ (tzap) format
  
  Antena3
  HD:578000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_4:HIERARCHY_NONE:501:503:148
  
- 
- $ lsb_release -a 
+ $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.4 LTS
  Release:	12.04
  Codename:	precise

** Attachment added: "signal.txt"
   https://bugs.launchpad.net/mythbuntu/+bug/1333207/+attachment/4142390/+files/signal.txt

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https://bugs.launchpad.net/bugs/1333207

Title:
  dvb-t tuner produces lots of UNC and bad MPEG streams randomly (1/2 of
  the times, but not deterministic)

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  Tuning of some dvb-t channels produces bad MPEG streams pseudo-
  randomly.

  Consecutively tuning several times to the same channel results in 1/2
  of the time channel lock with almost 0 UNC and 1/2 of the time with
  high rates of UNC. That second scenario makes the mpeg stream
  unwatchable (even no output in dvr0 most of the time)

  A sequence of "tzap -r channel_name" results in a cycle of OK/KO tuning results. After an "OK" tuning (no BER, no UNC, signal level aprox 0x6600)
  I always get a "KO" tuning (high BER, high UNC, signal level aprox 0x7700)

  Note that "pseudo-randomly" means that sometimes it doesn't happen at
  all but, when it happens, you always get the 50%-50% KO-OK sequence.
  Unfortunatelly, I'm not able to reproduce it on demand, it depends on
  some unknown conditions.

  Additional information:

  Channel example (this specific channel -Spain DVB-T- in channels.conf
  (tzap) format

  Antena3
  HD:578000000:INVERSION_AUTO:BANDWIDTH_8_MHZ:FEC_2_3:FEC_AUTO:QAM_64:TRANSMISSION_MODE_8K:GUARD_INTERVAL_1_4:HIERARCHY_NONE:501:503:148

  $ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 12.04.4 LTS
  Release:	12.04
  Codename:	precise

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