| Monday, June 25th, 2018, 00:04 UTC | ||
| [00:04:23] | itr2401 (itr2401!~Alex@124-149-24-216.dyn.iinet.net.au) has joined #mythtv-users | |
| [00:05:48] | itr2401: | hi – is anyone around that can advise on how to interpret the output values of tzap? specifically the signal & snr values – are they in hex or something else? |
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| [02:16:13] | mack-: | itr2401: I've never used it, but looking at the mythtv wiki article on it, it does seem to be a hexidecimal value as a percentage of ffff |
| [02:16:54] | mack-: | so to convert to a percentage, take the number it shows, convert to decimal and divide by 65535 |
| [02:17:12] | mack-: | well, 655.35 |
| [02:18:27] | mack-: | kinda weird to do something that way |
| [02:25:53] | mack-: | reading more on the linuxtv wiki, it looks like it's up to the tuner as to what gets displayed there. If the card is only supplying 8 bits of data, for example, the hex number shows repeats |
| [02:27:49] | mack-: | in general, to quote from the wiki: Not all the numbers are implemented in some drivers, but good is signal > 8000, status 1f (all bits set), snr (Signal to Noise Ratio) should be > 8000, ber (bit error rate) – low is good, unc (Uncorrectable blocks) – low is good. |
| [02:32:17] | itr2401: | mack – thanks ... im having some weird issue i am trying to track down .. very random signal breakup that only occurs under mythtv – same signal to tv no issues |
| [02:34:36] | itr2401: | signal (based on calcs) is fluctuating between 82 – 85%, SNR ~ 34.7%, ber is mainly all 0 except for the odd 00000036, 00000048, 0000000c etc every now and then |
| [02:36:09] | itr2401: | when I am watching & recording & play back the recording I am getting "[mpegts @ 0xa10f40] PES packet size mismatch", [mpeg @ 0xa18f60] buffer underflow i=0 bufi=2054 size=9657 |
| [02:36:33] | itr2401: | then ultimately a lot of these – [mp2 @ 0x7fb5bc00e680] Header missing |
| [02:37:20] | itr2401: | when when watching at the same time via a tv – there is zero digital interferance / signal loss where the actualy mythtv recording "loss" occurs |
| [02:39:30] | itr2401: | unc – is a steady 000000c0 however |
| [02:41:05] | mack-: | usually more knowledgeable people active during the week |
| [02:41:51] | mack-: | it's still the weekend for the western hemisphere |
| [02:46:35] | itr2401: | thanks .. will keep switching things around |
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