[Feature Request] FFMpeg 'pad' command

[Selur]

Sorry, that it hinders your workflow.
I will not add support for all the options pad offers:

39.182 pad
Add paddings to the input image, and place the original input at the provided x, y coordinates.

It accepts the following parameters:

width, w
height, h
Specify an expression for the size of the output image with the paddings added. If the value for width or height is 0, the corresponding input size is used for the output.

The width expression can reference the value set by the height expression, and vice versa.

The default value of width and height is 0.

x
y
Specify the offsets to place the input image at within the padded area, with respect to the top/left border of the output image.

The x expression can reference the value set by the y expression, and vice versa.

The default value of x and y is 0.

If x or y evaluate to a negative number, they’ll be changed so the input image is centered on the padded area.

color
Specify the color of the padded area. For the syntax of this option, check the (ffmpeg-utils)"Color" section in the ffmpeg-utils manual.

The default value of color is "black".

eval
Specify when to evaluate width, height, x and y expression.

It accepts the following values:

‘init’
Only evaluate expressions once during the filter initialization or when a command is processed.

‘frame’
Evaluate expressions for each incoming frame.

Default value is ‘init’.

aspect
Pad to aspect instead to a resolution.

The value for the width, height, x, and y options are expressions containing the following constants:

in_w
in_h
The input video width and height.

iw
ih
These are the same as in_w and in_h.

out_w
out_h
The output width and height (the size of the padded area), as specified by the width and height expressions.

ow
oh
These are the same as out_w and out_h.

x
y
The x and y offsets as specified by the x and y expressions, or NAN if not yet specified.

a
same as iw / ih

sar
input sample aspect ratio

dar
input display aspect ratio, it is the same as (iw / ih) * sar

hsub
vsub
The horizontal and vertical chroma subsample values. For example for the pixel format "yuv422p" hsub is 2 and vsub is 1.

see: https://ffmpeg.org/ffmpeg-all.html#pad-1

since it would require a mayor rewrite of the internal logic of all the calculations around PAR, crop, resize to be sure everything works as it does now.


Cu Selur