[mythtv-users] judder with SD material

[Igor Cicimov]

On 11/01/2013 9:21 PM, "Frank Schlimbach" <galaxy_engine at gmx.de> wrote:
>
> -------- Original-Nachricht --------
> > Datum: Fri, 11 Jan 2013 08:40:00 +0000
> > Von: mythtv-users-request at mythtv.org
> > An: mythtv-users at mythtv.org
> > Betreff: mythtv-users Digest, Vol 118, Issue 34
>
> > Message: 4
> > Date: Fri, 11 Jan 2013 09:17:18 +1100
> > From: Igor Cicimov <icicimov at gmail.com>
> > To: Discussion about MythTV <mythtv-users at mythtv.org>
> > Subject: Re: [mythtv-users] judder with SD material
> > Message-ID:
> >       <
CAAKASGxD3gak65s-8pVowYPfiVnqu8YOuomS6qhV6PE8FpfhOQ at mail.gmail.com>
> > Content-Type: text/plain; charset="iso-8859-1"
> >
> > On 11/01/2013 2:01 AM, "Frank Schlimbach" <galaxy_engine at gmx.de> wrote:
> > >
> > > > Hi,
> > > > I lately switched to using separate backend and frontend machines,
> > > > both running current mythbuntu and mythtv 0.26+fixes.  The weird
thing
> > > > I am experiencing is that watching HD material seems to work fine
> > > > while SD liveTV and recordings judder heavily (every 1-2 seconds or
> > > > even more frequently). Most discussion on this topic I found are
about
> > > > the more intuitive reverse case, where HD is the problem. The
build-in
> > > > SD test works fine and playing the same file locally with vlc also
> > > > looks good. CPU (Intel G530, no graphics card) load is low and I am
> > > > running gigabit ethernet.
> > > >
> > > > Any idea?
> > >
> > > I did some more experiments. My TV can actually play all recordings
> > directly through DLNA without any judder (it has other problems,
though).
> > > I also realized that both HD and SD recordings judder - but HD just
not
> > as strongly, but maybe more frequently. So I now suspect that this must
be
> > related with the network connection on the client side. I'll check
cables
> > tonight, but this experiment doesn't seem very promising.
> > >
> > > Any thoughts, experience, hints, ideas on how to debug this problem
are
> > highly welcome.
> > >
> > Did you read the judder free mythtv wiki page?
>
> I am sorry I didn't mention it: Yes, I did. I followed it as much as I
could (I am not using a Nvidia card) but it didn't help. I also used setuid
without any effect.
>
> Last night I made a few more experiments
> 1. I switched network cables: no change
> 2. I used VLC on the same frontend machine to get the uPnP streams from
the mythtv server: *NO* judder
> 3. I decreased the ringbuffer size in the backend: Maybe a little effect,
but maybe not
> 4. I used the OpenGL high quality setting in the frontend:
>    - higher CPU load
>    - less judder, but still visible and annoying
>
> So the current state is that it's probably not the network. Something in
the MythTV frontend seems to be responsible for this.
>
> Are there any debug flags I could try?
> Any other parameters I could experiment with?
>
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And you did set separate video mode for gui and tv playback in the setup
right?
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