[FFmpeg-devel] [PATCH] added expr evaluation to drawtext - fontsize

Michael Niedermayer michael at niedermayer.cc
Tue Aug 30 01:45:54 EEST 2016

On Mon, Aug 29, 2016 at 02:23:44PM -0700, Brett Harrison wrote:
> Before I fix the patch, can you clarify the intended functionality?
> The docs say that 16 is the default fontsize, however if
> CONFIG_LIBFONTCONFIG is configured and ffmpeg if called with:
> -vf drawtext=text=abc:fontcolor=white
> on my system the font used will be /opt/X11/share/fonts/TTF/Vera.ttf (the
> default chosen by libfontconfig) and the fontsize will be set to 12.
> However if ffmpeg is called with:
> -vf
> drawtext=text=abc:fontcolor=white:fontfile=/opt/X11/share/fonts/TTF/Vera.ttf
> This is the same font that libfontconfig used, however this time fontsize
> 16 is used as stated in the docs.
> The difference is this line of code in load_font_fontconfig
>   if (!s->fontsize)
>         s->fontsize = size + 0.5;

> I didn't set the fontsize in either command, but the output was different.
> Do we want to keep this as is?

I think no
can you send a seperate patch that changes this ?
(it should really not change as a sideeffect of this patch)

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

No snowflake in an avalanche ever feels responsible. -- Voltaire
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