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 -- You received this bug notification because you are a member of Mythbuntu Bug Team, which is subscribed to Mythbuntu. 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 To manage notifications about this bug go to: https://bugs.launchpad.net/mythbuntu/+bug/1333207/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~mythbuntu-bugs Post to : mythbuntu-bugs@lists.launchpad.net Unsubscribe : https://launchpad.net/~mythbuntu-bugs More help : https://help.launchpad.net/ListHelp
