Playing around, I managed to animate the rotation:

$ melt -proifle hdv_720_50p -consumer sdl2 +hello.txt -attach affine
transition.rotate_x="1=1.5;100=200"

$ melt -proifle hdv_720_50p -consumer sdl2 +hello.txt -attach affine
transition.rotate_y=4

$ melt -profile hdv_720_50p -consumer sdl2 +hello.txt -attach affine
transition.keyed=1 transition.rotate_x="0=1;100=10"

I hope this might help others too.

El sáb, 1 ene 2022 a las 23:43, Dan Dennedy (<d...@dennedy.org>) escribió:

>
>
> On Sat, Jan 1, 2022 at 2:20 PM José María García Pérez <
> josemaria.alk...@gmail.com> wrote:
>
>> I tried the following:
>>     $ melt -proifle hdv_720_50p -consumer sdl2 +hello.txt -attach affine
>> transition.rotate_x="0=0;100=340"
>>
>> I was expecting to get a rotation animation.
>>
>>
> That property does not support keyframe animation. Not all the properties
> do. So this string converts to a number as 0.
>
>
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