[mythtv-users] Objective IVTV quality measurement instructions
dean vanden heuvel
deanv at cox.net
Sun Aug 15 15:07:45 EDT 2004
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.
> >
> >
> >
>
More information about the mythtv-users
mailing list