[mythtv-users] Objective IVTV quality measurement instructions

[dean vanden heuvel]

Thanks for all the advice...

I'm not really concerned about space, as I don't burn often anyway.  I'm  more concerned about getting the *best* image when I playback or watch *live tv*.  I have pegged the bit rate in my recording profile for *live tv*, and IF I cannot get any better by sampling 720x480, then I was thinking that sampling less pixels (640x480) using the pegged bit rate MIGHT improve what I am seeing...then of course, if 640 is better, then perhaps 480 might be even better yet.

I understand the advantage of grabbing 720 for direct record to DVD, and thanks for that info...I learned something new yet again.

BTW, since my source is 16x9 (from a samsung HD satellite receiver), I think there is no way I can get to *square pixels* and retain all 480 lines vertically.  Do you agree?

-dvh

On Sun, 15 Aug 2004 09:26:44 -0400 (EDT)
Cory Papenfuss <papenfuss at juneau.me.vt.edu> wrote:

>  	That's quite true.  Trouble is DVD doesn't support 480x480 which would 
> be the "right one," and 704x480 is *WAY* overkill for broadcast.  The ivtv 
> cards do a particularly bad job of capturing at low resolutions (e.g. 352x480) 
> and/or low bitrates (<4 Mbps).  That translates into 2 hours *MAX* onto a DVD 
> if you don't transcode it... and even that it difficult to get decent quality.
> 
>  	If it's just for convenience, I'd agree that burning the raw ivtv mpeg 
> onto DVD is nice.  It's just a pretty big waste of space.  I guess DVD-R's 
> aren't $1.5 apiece anymore either though... :)
> 
> -Cory
> 
> 
> *************************************************************************
> * Cory Papenfuss							*
> * Electrical Engineering Ph.D. Graduate Student                         *
> * Virginia Polytechnic Institute and State University 			*
> *************************************************************************
> 
> 
> On Sun, 15 Aug 2004, William wrote:
> 
> >> So, would your experience tell you that I can get replay that
> >> is *just as good* if I capture at 640 (or less), or should I
> >> stay with 720?  for live TV,
> >
> > If you capture at 640 rather than 720 then you will not be able to burn the
> > video to a DVD without transcoding it up to the proper resolution. If you
> > really want to save space, transcode the stuff you want to keep to divx or
> > another compressable format.
> >
> >
> >
>