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Full Discussion: How to change ffmpeg default font size?
Operating Systems Linux Ubuntu How to change ffmpeg default font size? Post 302998548 by baris35 on Saturday 3rd of June 2017 12:51:02 PM
Old 06-03-2017
How to change ffmpeg default font size?
Hello,

I have a problem with Greek subtitle font size when I map a subtitle file into a video in ffmpeg.

I ran below code:

Code:
ffmpeg -i video.mp4 -sub_charenc CP1253 -i video_sub.srt -c:v copy -c:a copy \ 
-c:s mov_text -metadata:s:s:0 language=gr mapped_video.mp4

When I play it in VLC, it gives very small subtitle size.

Then I tried to increase subtitle fontsize but no luck.

Code:
ffmpeg -strict -2 -i video.mp4 -sub_charenc CP1253 -vf subtitles=video_sub.srt:force_style='Fontsize=30' \ 
-qscale:v 3 -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=gr mapped_video.mp4

Also tried this one but failed again:

Code:
ffmpeg -strict -2 -i video.mp4 -sub_charenc CP1253 -vf "subtitles=video_sub.srt:force_style='Fontsize=30'" \
-qscale:v 3 -c:v copy -c:a copy -c:s mov_text -metadata:s:s:0 language=gr mapped_video.mp4

As default fontsize in ffmpeg is 16, this time I increased fontsize from 16 to 30 in vf_drawtext.c file, then I reconfigured ffmpeg and replaced new ffmpeg binary file but nothing changed.

PS: I tested below code as -vf is invalid when -c:v copy is selected..
Code:
ffmpeg -strict -2 -i video.mp4 -sub_charenc CP1253 -vf subtitles=video_sub.srt:force_style='Fontsize=30' \ 
-qscale:v 3 -c:v libx264 -c:a copy -c:s mov_text -metadata:s:s:0 language=gr mapped_video.mp4

Could you please explain how I may do this?


Thanks
Boris
Last edited by baris35; 06-03-2017 at 04:21 PM.. Reason: last attempt
 

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LEARN ABOUT OSF1

xmfontlistentrycreate

XmFontListEntryCreate(3X)												 XmFontListEntryCreate(3X)

NAME

       XmFontListEntryCreate - A font list function that creates a font list entry

SYNOPSIS

       #include <Xm/Xm.h>

       XmFontListEntry XmFontListEntryCreate (tag, type, font)
	       char *tag;
	       XmFontType type;
	       XtPointer font;

DESCRIPTION

       XmFontListEntryCreate  creates a font list entry that contains either a font or font set and is identified by a tag.  Specifies a NULL ter-
       minated string for the tag of the font list entry.  The tag may be specified as XmFONTLIST_DEFAULT_TAG,	which  is  used  to  identify  the
       default	font  list  element  in  a  font  list.   Specifies whether the font argument is a font structure or a font set.  Valid values are
       XmFONT_IS_FONT and XmFONT_IS_FONTSET.  Specifies either an XFontSet returned by XCreateFontSet or a pointer to an XFontStruct  returned	by
       XLoadQueryFont.

       The  toolkit  does  not	copy  the  X  Font  structure  specified by the font argument.	Therefore, an application programmer must not free
       XFontStruct or XFontSet until all font lists and/or font entries that reference it have been freed.

RETURN VALUE

       Returns a font list entry.

SEE ALSO

       XmFontList(3X), XmFontListAppendEntry(3X), XmFontListEntryFree(3X), XmFontListEntryGetFont(3X), XmFontListEntryGetTag(3X), XmFontListEntry-
       Load(3X), XmFontListRemoveEntry(3X)

															 XmFontListEntryCreate(3X)
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