9 Mar
2016
9 Mar
'16
3:40 p.m.
Hmm, I just tried it and at first sight, it looks as if DCP-o-matic is doing everything
right.
You are right in that there is no dedicated container format for this type of source
footage, but that is how DCI meant this to be.
DCP-o-matic applies the right scaling to 16:9, and tries to fill the chosen flat container
as much as possible. The best container for this type of footage is flat/1.85.
That leaves black bars on the sides (1920->1998) and of course the letter boxing in
place. To get rid of the side bars, you choose 'Scale to Flat/1.85', then crop
top/bottom to adjust for the slight stretch from 1920 to 1998.
It's impossible to have dedicated preset for every imaginable aspect ratio and target
size. I have opted for a universal x/y crop/scale GUI option before, but I know what
inexperienced users would make of it, so, I would rather avoid it.
It's not a bad thing to have letterboxing in your DCP - The Hateful Eight was
delivered in a 2.76 AR (4096*1484), letterboxed in a scope container (4096*1716).
- Carsten
Am 09.03.2016 um 15:53 schrieb Christian Hove via DCPomatic:
Hi,
A problem that I have run into a few times:
I can't find a convenient way to remove the black bars from letterboxed content with
non-square pixels and non standard aspect ratio.
An example:
Content with letterbox (62 pixels top and bottom) is 720x576 and has a pixel aspect ratio
of 1.42:1
Display aspect ratio is 1.78:1 (16:9), so the displayed image is 1024*576 including the
letterbox and 1024*452 with the letterbox removed. This gives a aspect ratio of 2.27:1
which to my knowledge does not fit any of the predefined containers.
- With "Scale to" set to 16:9 the picture is not distorted but shown with
letterbox and not filling the container.
- Cropping top and bottom bar distorts the image because the display aspect ratio is
fixed and not the pixel aspect ratio.
- Changing "Scale to" to "no stretch" distorts the image because the
pixels are displayed square (which they really are not).
So what I need is a "Scale to" option that keep the pixel aspect ratio fixed to
whatever is reported with ffprobe (specified in the video header?) - That way I can crop
the image without distorting it.
Have I overlooked an obvious way to make the useful part of the image fit the height of
the container without distortion?
The example content is available here:
https://www.dropbox.com/s/2qeex6oautq8vlj/06_Oscar_1.mpg?dl=0
Cheers,
Christian
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