Mon, 28 Jan 2008 07:02:00 -0800 Herman Robak wrote:
On Sun, 27 Jan 2008 18:29:58 +0100, Herman Robak <[EMAIL PROTECTED]>
wrote:
On Sun, 27 Jan 2008 15:42:17 +0100, Terje J. Hanssen <[EMAIL
PROTECTED]> wrote:
What are really "W Ratio" and "H Ratio" vs "Aspect Ratio"?
w/h ratio _seems_ like pixel aspect ratio. But I have not quite
figured out if that works the way it should.
When I feed the pixel aspect ratio for PAL into it (1.094/1.0)
it changes the X (width) from 720 to 787, which would be the
correct _display width_.
But what Cinelerra then does is to squash the 720 pixels of the
source video so that the new 787 pixel wide canvas fits within
a 4:3 box, with black bars on the sides. That's the opposite of
what I wanted. Is it me or Cinelerra who is dumb here?
I think it is me who is "dumb", because I may have misunderstood
the B/W values' intent. Jugding by their behaviour, they look like
convenience inputs that you can use to change the current width and
height by a certain factor.
Usecase: The current resolution is 640x480, and for some reason
you want it to be 1.33 times wider. You don't have to calculate
what 640x1.33 is; you type 1.33 into the "W" input instead, and
Cinelerra calculates it for you.
Do you consider this "helper" feature useful and necessary?
Herman,
I'm still confused and not sure about the intention and working set of
the B/W values.
And nn case some of our comments have been crossposted, I'll sum up the
essentials from my two last posts on this subject part:
-> selecting Set Format>Presets to 1080i results in the following video
attributes:
Frame rate: 29.9700
Width: 1920
Height: 1080
W Ratio: 2.6667
H Ratio: 1.8750
As full HD video 1920x1080 resolution already is set here, the W and H
values as I understand it cannot be any multiply (x) for these
resolutions values (?)
Playing with number ratios, also have at this calculations:
Width of 1080_HD_video/DV=1920/720 =2.6667=W_Ratio_for_1080_HD_video
Height of 1080_HD_video/DV=1080/576=1.8750=H_Ratio_for_1080_HD_video
Mere chanches or some reasonable explanation for these coincidences?
----------------
Terje J. Hanssen
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