Am 11.10.2021 um 11:26 schrieb Paul B Mahol:
On Mon, Oct 11, 2021 at 11:15 AM Michael Koch <[email protected]>
wrote:
Hello,
I have a question about the shuffleplanes filter. In this example the
pixel format is RGB24. So the first plane is red and the second plane is
green. I want to swap the red and green planes.
ffmpeg -f lavfi -i testsrc2 -lavfi
format=rgb24,split[a][b];[b]shuffleplanes=1:0:2[b];[a][b]vstack -frames
1 -y out.png
But in the output green is swapped with blue. I don't understand why.
I'm using the latest Windows build, just a few days old.
As usual you add additional premise that does not makes sense and is
incorrect.
rgb24 is not planar but packed.
gbrp is used internally and works as expected, as filter does not care
about R/G/B/A order.
It just shuffles planes.
thanks, that explains the unexpected result. It would be helpful to add
a note to the documentation:
"The input pixel format must be planar, for example gbrp. If a
non-planar pixel format is used (for example rgb24), a format conversion
is inserted automatically and you might get unexpected results."
Michael
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