[mythtv-users] Video quality?

Kevin Page mythtv-users-list at krp.org.uk
Mon Oct 1 11:59:02 UTC 2007

(Matt, Dan, Piers: are you all using DVB? DVB-T? PAL?)

Hello Jay, all, thanks for your replies.

On Sun, 2007-09-30 at 18:38 -0400, Jay R. Ashworth wrote:
> Tell me: is it *this*?
> Frame through a recording and see if every 5 frames, the 6th frame is
> identical to the 5th frame.

I tried this earlier this morning, and I'm afraid not. Each frame is

Were you implying that Myth might duplicate a frame when recording, or
during playback? If the former, I'd expect (hope?!) that Myth is writing
the MPEG-2 PS straight to disk - it shouldn't need to mess with it at
all, should it?

> We had this problem, and it went away when we upgraded.  I *think* it
> was actually ivtv's fault, but I could never quite nail it down.

No ivtv here - at least not yet! (I have a PVR-350, and plan to use it
for a second myth box if this one works out).

I find a good comparison is watching the ticker at the bottom of a news
channel (e.g. News 24 in the UK). It's not _horribly_ jerky with MythTV,
it's just not as smooth as a STB using the same LCD monitor. Obviously
with the PC using the DVI connector and the STB using composite the STB
and/or LCD will be doing different processing on the composite feed -
but they're both receiving the same broadcast.

I wouldn't be at all surprised if this were something to do with
de-interlacing - it has the "smell" of it. Unfortunately I completely
rebuilt the OS on my PC in preparation for Myth so I can't go back and
check on my perceptions as they were before the rebuild.

To be clear: I'm new to Myth and haven't yet tried all configurations,
or searched through every nook and cranny of the documentation, wiki,
etc. I'm not using nvidia, or their proprietary drivers (nor will I).
However, it sounds like other have, and given...

On Sun, 2007-09-30 at 10:39 -0600, Brian Wood wrote: 
> That's what I meant. If the problem were inherent in the software itself
> we would be seeing a lot more complaints of this type.

...I just wanted to put my hand up and say "me too". The original poster
describes exactly what I'm experiencing.

As others have said, it's definitely something you could live with -
perhaps others are, silently?



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