[mythtv-users] Resolution

[Douglas Phillipson]

   James L. Paul wrote:
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> On Tuesday 02 December 2003 08:56, Douglas Phillipson wrote:
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>>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