Am 27.02.2020 um 00:14 schrieb Paul B Mahol:
On 2/27/20, Michael Koch <[email protected]> wrote:
Am 25.02.2020 um 11:37 schrieb Paul B Mahol:
On 2/25/20, Paul B Mahol <[email protected]> wrote:
On 2/25/20, Michael Koch <[email protected]> wrote:
Am 25.02.2020 um 10:40 schrieb Paul B Mahol:
On 2/25/20, Michael Koch <[email protected]> wrote:
Paul,
On 2/19/20, Michael Koch <[email protected]> wrote:
Hi,
would it be possible to allow expressions for the yaw, pitch and
roll
parameters in the v360 filter? I have a project where I need these
angles to be a function of time.
Nope, would make filter 10x times slower.
Would it always slow down the filter, or only if these expressions are
actually a function of time?
Some nice effects would be possible when the angles and/or field of
view
could be functions of time.
A "eval" option (like in "eq" filter) could be added to specify when
to
evaluate the expressions, and the default would be "init" for fast
processing.
Eval is evil. It is not gonna be added.
And what about sendcmd / commands?
Will look into adding it.
Done.
I have tested it and it works to send constant values to the v360
filter, but it doesn't work to send an expression, as in the 3rd line of
this *.cmd file. With overlay filter this method works fine.
0.00-1.00 v360 yaw 0;
1.00-2.00 v360 yaw 60;
2.00-4.00 v360 yaw 'lerp(60,120,t-2)';
I understand it doesn't work because v360 doesn't accept expressions.
Would it be possible to evaluate the expression already in sendcmd, and
then send the result to the target filter?
A workaround would be to write many lines in the *.cmd file, one line
for each frame.
I told you already that expressions are evil, slow, limited and ugly.
Evil and ugly? That's no problem for me :-) I need expressions for some
special effects and don't care about processing speed.
Regarding "limited" I have the opposite opinion. It's a limitation not
to have expressions.
Use mpv player, which have support to send commands via keybindings,
you could even write lua plugin(s).
Thanks for these hints, will have a look at them.
Michael
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