Transpose rows with columns in the input video and optionally flip it.

It accepts the following parameters:

dir

Specify the transposition direction.

Can assume the following values:

0, 4, cclock_flip

Rotate by 90 degrees counterclockwise and vertically flip (default), that is:

L.R     L.l
. . ->  . .
l.r     R.r

1, 5, clock

Rotate by 90 degrees clockwise, that is:

L.R     l.L
. . ->  . .
l.r     r.R

2, 6, cclock

Rotate by 90 degrees counterclockwise, that is:

L.R     R.r
. . ->  . .
l.r     L.l

3, 7, clock_flip

Rotate by 90 degrees clockwise and vertically flip, that is:

L.R     r.R
. . ->  . .
l.r     l.L

For values between 4-7, the transposition is only done if the input video geometry is portrait and not landscape. These values are deprecated, the passthrough option should be used instead.

Numerical values are deprecated, and should be dropped in favor of symbolic constants.

passthrough

Do not apply the transposition if the input geometry matches the one specified by the specified value. It accepts the following values:

none

Always apply transposition.

portrait

Preserve portrait geometry (when height >= width).

landscape

Preserve landscape geometry (when width >= height).

Default value is none.

For example to rotate by 90 degrees clockwise and preserve portrait layout:

transpose=dir=1:passthrough=portrait

The command above can also be specified as:

transpose=1:portrait