mythbuntu-bugs team mailing list archive

[JoseO <1333207@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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)

When booting to 3.2.0-58 the same sequence produces correct MPEG streams
and 0 UNC values all of the time.

Additional information:

Channel example (this specific channel -Spain DVB-T-, in my case, makes
the problem reproducible 100% of the time) from channels.conf

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

** Affects: mythbuntu
     Importance: Undecided
         Status: New


** Tags: dvb dvb-t kernel tuning

** Attachment added: "List of errors from mythtv when the tuning fails and produces high UNC values"
   https://bugs.launchpad.net/bugs/1333207/+attachment/4137466/+files/mythtv_errors.txt

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

Title:
  dvb-t tuner produces lots of UNC and bad MPEG streams randomly on
  kernel 3.2.0-64

Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
  New

Bug description:
  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)

  When booting to 3.2.0-58 the same sequence produces correct MPEG
  streams and 0 UNC values all of the time.

  Additional information:

  Channel example (this specific channel -Spain DVB-T-, in my case,
  makes the problem reproducible 100% of the time) from channels.conf

  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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