[mythtv-users] Resolution

mythtv mythtv at bruce.homelinux.com
Tue Dec 2 21:00:25 EST 2003


I have MPEG4 set at 720x480 at Bitrate 8000. For 1 minute of recording I get a 13Mb
file. Is this correct?
The video is horrible.  I am not sure what the deal is.
rtJpeg is much better, even at a 100 setting.

Any suggestions?

Bruce

Douglas Phillipson wrote:

>    James L. Paul wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > On Tuesday 02 December 2003 08:56, Douglas Phillipson wrote:
> >
> >>I guess I don't understand the resolution settings.  I change them and
> >>don't see any difference in video.  What am I missing?
> >
> >
> > That's a good thing. Consumer TV displays are pretty low resolution devices,
> > so without knowing how low you set yours it's hard to say what you are
> > missing. :)
> >
> > VHS is generally accepted to be equivalent to 352x240 if there are no
> > noticeable compression artifacts. SVHS is generally 352x480. If your
> > resolution is higher than this and you are using a high enough bitrate to
> > avoid compression artifacts, then it's entirely likely that the difference in
> > the results is very subtle.
> >
> > The TV out quality of most video cards isn't usually good enough to
> > distinguish the subtle differences, and scaling the video on a computer
> > monitor doesn't give a true representation of the video quality.
> >
> > My goal is to use the lowest resolution and bitrate I can without noticing a
> > quality drop. For me and my dvd player, that happens to be MPEG2 1/2 D1, so I
> > use 352x240 at about 2500k bitrate. (Which also happens to be perfect for CVD
> > and DVD which my standalone player works great with.)
> >
> > Unless you set the bitrate or resolution too low, you probably aren't going to
> > see big differences in quality. You will see big differences in file size
> > though! :)
> >
> >
> >>DSP
>
> I have all my software encoder settings set at 480x480, pretty much the
> default.  I do have a problem with the video slowing down and the audio
> chattering after 5 or ten minutes.  Might these resolutions have
> something to do with it?  I can stop and restart play and all is fine
> for another while.  I'm not running out of memory and my CPU is a 5% or
> so so it shouldn't be a CPU speed issue.  I have noticed the CPU load
> seems to go up when it starts to happen but it never gets maxed out.  I
> have a Athlon 2200+ machine with a WinTV Go card, Redhat 9 and installed
> via apt.
>
> Regards  and thanks for a great program
>
> DSP
>
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