Hello all,
I'm new to this list and have a question about drawtext with dynamic
fontcolor.
The first example doesn't contain dynamic fontcolor and is working as
expected.
It superimposes some text over the video with black color and 25%
transparency:
ffmpeg -i temp.mp4 ^
-vf
drawtext='fontfile=arial.ttf:text="TEST":fontcolor_expr=0x000000@0x40:fontsize=200'
^
-codec:v mpeg4 out.mp4
Now I replace
fontcolor_expr=0x000000@0x40
by
fontcolor_expr=0x000000@0x%%{e:40}
Please note that the "%" character is escaped because I'm starting
ffmpeg from a windows batch file.
Of course the constant doesn't make much sense -- I will replace it
later by a more complicated expression.
But the constant 40 is a valid expression, isn't it?
The problem is that obviously the syntax isn't accepted by ffmpeg.
What's wrong with it?
Can you please give me an example for dynamic fontcolor with correct syntax?
Thanks,
Michael
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