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After running MythTV with DVB-S for many years I have upgraded to
MythTV 0.27 and cut over to a DVB-T tuner. We are seeing a lot of
video corruption in TV scenes with movement (on channels 1, 2 &
3). Typically a head or moving object will pixelate or get fuzzy
edges. This will happen every few minutes. The sound sometimes
glitches as well.<br>
<br>
I'm getting signal from Sugarloaf in Christchurch. Are other people
getting a good picture? I have spoken to a couple of people with
different tuner hardware and a different version of MythTV and they
are reporting similar issues. Is it a MythTV thing? I don't have a
reliable non-mythtv tuner to compare against. In theory the MythTV
backend is just copying the transport stream to disk, so I am trying
to figure out where things are going wrong.<br>
<br>
I've tried to re-mediate and check off possible problems:<br>
<ul>
<li>I've changed the antenna to a UHF only antenna (02MM-MDU36) -
this is higher gain that required<br>
</li>
<li>The cabling is all properly crimped and sealed<br>
</li>
<li>I do have some trees that aren't feasible to trim in the line
of sight</li>
<li>I am using a HDHomerun</li>
<ul>
<li>with the latest firmware (20130328)</li>
<li>reasonable signal strength, 100% SNR and symbol error
quality<br>
</li>
</ul>
<li>my backend recordings are on a NFS drive that can write at
greater than 40M bytes/sec</li>
<li>the network switch isn't reporting any error frames</li>
<ul>
<li>GbE switch</li>
<li>Intel NICs<br>
</li>
</ul>
<li>on the frond end, rewinding over the glitch doesn't overcome
the issue</li>
<li>copying the files to a windows machine and watching with VLC
doesn't fix the issue</li>
<ul>
<li>VLC seems to pause through the errors rather than showing
pixellation<br>
</li>
</ul>
<li>I've tried leaving a ping running against the hdhomerun<br>
</li>
<li>the backend is:</li>
<ul>
<li>a CentOS v6.4 virtual</li>
<li>MythTV 0.27<br>
</li>
<li>NFS for the video store</li>
</ul>
<li>I don't have a backout plan as the old machine has ECC memory
errors, very old disks and the DVB-S tuner is a 5volt only PCI
card<br>
</li>
</ul>
<p>Any ideas please?<br>
</p>
<p>Greg.<br>
</p>
<p>--<br>
</p>
<p># hdhomerun_config ffffffff get /sys/version<br>
20130328<br>
</p>
<p># hdhomerun_config ffffffff get /tuner0/debug<br>
tun: ch=t8qam64:594000000 lock=t8qam64:594000000 ss=93 snq=100
seq=100 dbg=-417/-12288<br>
dev: bps=26344064 resync=0 overflow=0<br>
ts: bps=26344064 ut=95 te=0 miss=0 crc=0<br>
flt: bps=2210880<br>
net: pps=210 err=0 stop=0<br>
<br>
</p>
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