I am trying to add a text to a video using ffmpeg and python.
I tried to do this in the following ways, but it didn’t work.

first

(
         ffmpeg
         .input(in_video)
         .filter('drawtext',
                 fontsize=30,
                 fontfile=r"D:projectspythoneditor_botdownloadsCandara.ttf",
                 text='test test test.',
                 x='if (eq(mod(t\, 15)\, 0)\, rand(0\, (w-text_w))\, x)',
                 y='if (eq(mod(t\, 10)\, 0)\, rand(0\, (h-text_h))\, y)')
         .output(f'output-final.mp4')
         .run()
 )

second

fil = fr"drawtext=text='test test test':fontsize=30:fontfile=':projectspythoneditor_botdownloadsCandara.ttf':x='if (eq(mod(t, 15), 0), rand(0, (w-text_w)), x)':y='if (eq(mod(t, 10), 0), rand(0, (h-text_h)), y)'"
    (
        ffmpeg
        .input(in_video)
        .output(f'output-final.mkv', filter_complex=fil)
        .run()
    )

But by running this command

ffmpeg -i v1.mp4 -filter:v drawtext="fontsize=30:fontfile=candara.ttf:text='testtest test.':x=if(eq(mod(t,15),0),rand(0,(w-text_w)),x):y=if(eq(mod(t,10),0),rand(0,(h-text_h)),y)" -c:a copy -c:v libx264 -preset slow -crf 18 V13.mkv

In the terminal, what I want is done exactly

thanks