Re: Clip & Zoom questions (was: Re: [dvd::rip] (no subject))

"Brian J. Murrell" wrote:

> So now that it's working, it seems that it's chosen 56/56 for the
> top/bottom clip1.  The frame sizes however are 848x368, 704x304,
> 688x288, ...  Where do these frame sizes come from?

dvd::rip just "tries" systematically a range from frame sizes 
calculating AR error, BPP and stuff printing this in the Zoom 
Calculator's list. Probably reading this helps understanding the Zoom 
Calculator...

  http://www.exit1.org/dvdrip/doc/gui-gui_zoom_calc.cipp

> Ideally I don't
> want to scale the x axis, just the y axis, for A/R.  So seeing as the
> original is 720x480, it would be nice to have a Zoom calculation that
> does not alter the video width or height.

Then the Zoom Calculator isn't for you...

I think we're spinning around here and the discussions gets useles... 
You want (but currently cou can't):

  a) automatically clip borders in clip1
     (we know this is to be implemented after my first reply)
  b) enter a width manually (720)
  c) let dvd::rip calculate the height automatically, results
     in nearly perfect AR
  d) if you want to have fast resizing, you need to correct
     the values manually to fulfill the requirements, introducing
     small AR errors again. But probably you don't want fast resizing
     at all, since a HQ rip is apparently what you want...

> My goal is to completely preserve everything about the video and just
> better compress it into a smaller-producing codec.

Then you probably shouldn't do any resizing. Of course you have an 
anamorphic video then, which need to be resized on playback, just like 
any DVD.

> Hrm.  Now that I have played with the Zoom Calculator on this frame, and
> decided I don't like it's settings, I can't seem to choose any clip1
> values that allow Fast Resizing.  Even no clip at all (0 top and bottom)
> won't activate the Fast Resizing radio buttons -- they are greyed out.

That's because the neccessary requirements are not met.

> Lists all "perfect" A/R sizes?  Is that why the 720x??? is not listed?
> Because it would produce an A/R error?  Even though the original is
> 720x??? ?

Again: refer to the docs.

> Grabbing new frames seems to take very long now though.  I have been
> waiting 8 minutes now.  But I think eventually it will succeed as I did
> have a new frame today from a grab I did yesterday.

Did you read this?

  http://www.exit1.org/dvdrip/doc/gui-gui_clip_zoom.cipp#clip_zoom_grab

You're using the on-the-fly mode, which is known to be slow. Rip first,
and preview frame grabbing will just take a second.

Regards,

Joern

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