[mythtv-users] hdhomerun and 0.25 gives me artifacts on HD channels

[Dan Wilga]

On 4/22/12 6:02 AM, jakommo wrote:
> Hello,
>
> I'm having trouble using my hdhomerun (HDHR3-EU) on mythtv 0.25. All 
> the SD channels are working fine but on HD channels I get artifacts on 
> LiveTV and recordings.
> I have a dedicated frontend/backend machine where I installed 
> mythbuntu 12.04 Beta 2 (mythtv 0.25) + all updates for mythbuntu and 
> mythtv.
> On another partition of the same machine I have my old installation of 
> mythbuntu 10.10 (mythtv 0.23-fixes) where everything works fine 
> including the HD channels, so I think its not an hardware failure.
> First I thought it was an VDPAU problem but the artifacts are also 
> appearing using a non VDPAU profile.
> Using hdhomerun_config_gui and vlc from 12.04 HD works fine.
> As I'm aware that mythbuntu 12.04 is still in development I installed 
> mythtv 0.25 (atrpms) on my CentOS 6 fileserver and used my Desktop as 
> a fronted (Fedora 16 also atrpms). Same thing there, the HD channels 
> have artifacts.

Interesting. Since going to 0.25 I have noticed problems with a few OTA 
recordings, but narrowed it down to two unrelated things:

1. Transcode settings. One morning last week, I watched a cartoon with 
my kid as it was recording, and it was perfect. Later that day, he 
wanted to watch it again, but it showed artifacts during motion (he 
didn't notice, thankfully.) Despite the fact that 0.25 was using the 
same transcoding settings I had used in 0.24, it was introducing 
artifacts. So I created a new transcoding profile specifically for 
"autodetect from 1080i" and tweaked a few settings. It seems better now, 
though still not as good as it was under 0.24. I may need to tweak some 
more.

2. Weather. We've been having really bad (but much needed) rain the past 
day or two, and my OTA reception has suffered, on a channel which is 
usually immune to weather. hdhomerun_config_gui shows occasional 
dropouts. I'm going to wait and see if this clears up along with the rain.

BTW, I'm still using the older 20120128 firmware, though 20120405 does 
look like it might help in some circumstances.
-- 

Dan Wilga                                                        "Ook."