Am 18.09.2021 um 18:22 schrieb Michael Koch:
Am 18.09.2021 um 18:07 schrieb Cecil Westerhof via ffmpeg-user:
I have several of the following (simplified):
drawtext=
enable = 'between(t, 105, 115)':
text = 'speaker':
y = main_h - (text_h * 4),
drawtext=
enable = 'between(t, 105, 115)':
text = 'subject':
y = main_h - (text_h * 2.2),
I have been carefully tweaking to get them on the correct place.
But when I was satisfied and generated all eight places where I wanted
to have them the placement of the speaker and subject text is on
different heights. Sometimes one or the other is different, sometimes
both and sometimes they are the same.
Is this a bug, or am I doing something wrong?
The content of the variable "text_h" depends on which characters you
are printing.
If you don't use "text_h", then the characters "a" and "q" are printed
at the same height:
ffmpeg -f lavfi -i color=yellow -lavfi
drawtext=text='a':x=20:y=50,drawtext=text='q':x=40:y=50 -frames 1 -y
out1.png
But if you use "text_h", then they are printed at different heights:
ffmpeg -f lavfi -i color=yellow -lavfi
drawtext=text='a':x=20:y=50-text_h,drawtext=text='q':x=40:y=50-text_h
-frames 1 -y out2.png
It gets even worse when you try to print apostrophes. It's impossible to
print all characters at the same height.
It doesn't wok without text_h:
ffmpeg -f lavfi -i color=yellow -lavfi
drawtext=text='a_':x=20:y=50,drawtext=text='_gG':x=40:y=50,drawtext=text='``':x=60:y=50
-frames 1 -y out1.png
And it also doesn't work with text_h subtracted:
ffmpeg -f lavfi -i color=yellow -lavfi
drawtext=text='a_':x=20:y=50-text_h,drawtext=text='_gG':x=40:y=50-text_h,drawtext=text='``':x=60:y=50-text_h
-frames 1 -y out2.png
Michael
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