[mythtvnz] Trying to troubleshoot DVB-T artifacts

[Steve V]

                    Hi Steve

This is what I run for a test


dvbtune -c 0 666000000 -m

Signal=56797, Verror=0, SNR=65535dB, BlockErrors=0, ()
Signal=56797, Verror=0, SNR=65535dB, BlockErrors=0, ()
Signal=56797, Verror=0, SNR=65535dB, BlockErrors=0, ()
Signal=56797, Verror=0, SNR=65535dB, BlockErrors=0, ()
Signal=56797, Verror=0, SNR=65535dB, BlockErrors=0, ()

What build of dvbtune do you have?

dvbtune --version
dvbtune 0.5


Steven Ellis - Technical Director
OpenMedia Limited
email   - steven at openmedia.co.nz
website - http://www.openmedia.co.nz

Hmm I get

steve at MythBackEnd:~$ sudo dvbtune -c 0 690000000 -m
Signal=43211, Verror=2097151, SNR=0dB, BlockErrors=0, (C|V|SY|)
Signal=49585, Verror=0, SNR=0dB, BlockErrors=19, (S|L|C|V|SY|)
Signal=49553, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49626, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49580, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49569, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49602, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49576, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49538, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49574, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
Signal=49612, Verror=0, SNR=0dB, BlockErrors=0, (S|L|C|V|SY|)
^C
steve at MythBackEnd:~$ dvbtune --version
dvbtune 0.5

I am running dvbtune over a shh connection from my frontend to my backend, but that shouldn't matter should it?

The other thing I am doing is running mythtv-setup just before I run dvbtune to stop the backend and free up the DVB card. There is probably a more elegant way of doing this. Could this affect my results in dvbtune?

I also notice that not only do I get zero for SNR but I also get all the letters at the end of each line which you do not have.

Thanks for your help.


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