[mythtv-users] am i dropping frames?

Steve Smith st3v3.sm1th at gmail.com
Wed Jan 16 09:14:29 UTC 2008

On 15/01/2008, Steve Peters - Priority Electronics <
steve at priorityelectronics.com> wrote:
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Jesse Burt
> Sent: Tuesday, January 15, 2008 9:53 AM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] am i dropping frames?
> On Tue, 2008-01-15 at 10:33 -0700, Brian Wood wrote:
> > Steve Peters - Priority Electronics wrote:
> >
> > > ____________________________________________________________
> > >
> > >
> > > Beww, so are you saying that this might be normal for myth
> > > recordings? Is everyone using mythtv stuck with this kind of
> > > playback problem? It's not the artifacts that are the problem, it's
> > > the lack of smooth playback that is the problem. I just don't see
> > > how any sports fan could put up with this. I go to other people's
> > > houses and watch sports there and I think to myself...I'd better not
> > > invite them over to my place to watch sports, cause that will make
> > > my mythtv setup look really bad. -Thanks
> >
> > No, you should be able to get a recording (and playback) that most
> > viewers would not be able to tell from "live" TV, unless you have some
> > very critical (and observant) viewers.
> >
> > If you are not, the first thing to do is determine if the problem is
> > with the recording or the playback. Try playing back a known good
> > recording, then try playing back a Myth recording with something other
> > than Myth.
> >
> > The recording you posted looked pretty good to me except for the
> > interlace artifacts.
> >
> > beww
> > _______________________________________________
> > mythtv-users mailing list
> > mythtv-users at mythtv.org
> > http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> I agree with beww that with the right settings it would be difficult to
> tell
> the difference unless, as stated, someone is very critical or observant or
> the difference is being looked for. With the right settings, I find that
> image impurities that are easily noticeable on my 15" Laptop LCD or 22"
> Desktop LCD wind up looking perfectly normal on a plain old 29" CRT TV.
> Also
> is that channel (in your example clip) available as a digital channel on
> your service (probably encrypted if it is)? If so, and your TV is
> connected
> to a cable/sat box, perhaps when watching TV through it, you are watching
> a
> digital version of the analog-encoded clip you posted. If so, that could
> account for a difference in quality.
> Cheers,
> Jesse Burt
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
> -----------------------------------------------------------------------
> Jesse, Steve, Mitch, and Brian, thanks for the replies,
> I have to agree with Steve... Bob is the problem :)
> I think if I can figure out why it is not working, I'll be set. That was
> recorded from espn analog. Time warner cable in my area has teriffic
> quality
> digital cable, where it looks way better than analog. On my espn digital
> (still in sd), I get the same effect. On my espn hd channel I get the same
> effect. So I don't think it's the signal that is the issue here.
> I'm not so concerned with the image artifacts... when I watch on my 14"
> widescreen laptop, I see them, but on my 55" 480p tv, I don't notice them
> at
> all, probably cause of the resolution of the screen I am viewing.
> As to figuring out if the problem is with the recording or the playback,
> Brian recommended playing back a know good recording, then try playing
> back
> a myth recording with something other than myth. ----well...that video I
> uploaded, I played back on my windows laptop, and it looked pretty decent.
> Also, what is a known good recording? Something downloaded from the web
> perhaps? Maybe one of you guys can upload or email me a known good
> recording
> (preferebly sports) and I can play it back on my laptop and then on my
> mythtv.....? :)
> Also, is there a way to find out if I am indeed dropping frames? Because
> if
> that is the issue, then all this other troubleshooting is for naught.
> Lastly for now, any ideas on how to fix Bob? Could it be related to an
> nvidia drivers setting or something like that?
> -Thanks so much for the help/tips.
> _______________________________________________
> mythtv-users mailing list
> mythtv-users at mythtv.org
> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users


Well the first thing to do is to get some log output:

mythfrontend -v playback  >/tmp/frontend.log

Should put some useful output in /tmp/frontend.log....

I'm guessing you'll see something along the lines of....."Refresh too low
for bobdeint defaulting to onefield..."
In which case you'll need "Viktor's Patch"... search this list for posts
from me mentioning Viktor & bob and you'll find it.

(You could also try  mplayer -vo xvmc:bobdeint  FILE.mpg,  this may or may
not work depending on your setup. But if it works you'll be able to see what
bob should look like)


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