On Sun, 21 Oct 2001, Peter Surda wrote:
> On Fri, Oct 19, 2001 at 06:45:07AM -0700, Billy Biggs wrote:
> > > > The +/-5ms error here is visible, especially on big cinematic pans.
> > > I REALLY doubt what you perceive as an error is a 5ms difference.
> > No? I'll post up a good example later today. Consider a pan where
> > the time between frames goes like this: 40ms, 45ms, 35ms, 45ms, 42ms...
> > So, the second frame is shown for much longer than the first or third.
> it's a 1frame difference if you have 100Hz refresh. I REALLY doubt a human eye
> can see the difference. I bet it is something else causing you to see
> disturbances. To see the 80ms disturbance I was talking about (missed frame on
> TVout) you already have to watch out a little. 10ms (45 - 35) is 8 times as
> difficult.
>
> Please don't understand me wrongly: I agree that the current situation is
> insufficient. I simply think that the cause of your problems is not exactly
> what you think :-).
The human eye will see the difference in a specific case - stroboscope.
Imagine that you have a film where every odd frame is green and every even
frame is red. Than if it happened that the duration of odd frames is
longer than duration of the even frames you'll notice. Now, we don't have
movies like that, but you might see a fence, or bicycle wheel or something
similar in the movie. Normally, a DVD will be designed for a specific
refresh rate. I would think that the DVD player application should
recommend a specific refresh rate for the screen as well - an integer
multiple of whatever DVD was targeted for.
Vladimir Dergachev
>
> > Speaking of TV output, if you're outputting interlaced material to a
> > TV then you MUST have accurate vsync, field dominance, and some way of
> > ensuring you never miss a field. Otherwise you get crazy effects of
> > people jumping back in time when you miss a field blit.
> My ATI does this on HW (AFAIK), i.e. it understands it can't blit both on even and
>odd
> frames.
>
> > Ideally for playing 24fps on a 25fps output,
> You don't have 24fps source usually. DVDs, dvd rips and tv caps are either 25
> or 29.9 (PAL vs NTSC). But I agree that a 24fps on TV will look sucky unless
> you modify playback speed.
>
> Bye,
>
> Peter Surda (Shurdeek) <[EMAIL PROTECTED]>, ICQ 10236103, +436505122023
>
> --
> Intel: where Quality is job number 0.9998782345!
>
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