linux-traipu team mailing list archive

[JoseO <1333207@xxxxxxxxxxxxxxxxxx>]

** Summary changed:

- dvb-t tuner produces lots of UNC and bad MPEG streams randomly on kernel 3.2.0-64
+ dvb-t tuner produces lots of UNC and bad MPEG streams randomly (1/2 of the times, but not deterministic)

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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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