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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 DEBIAN

winff

WINFF(1)																  WINFF(1)

NAME

       winff - video and audio batch converter using ffmpeg

SYNOPSIS

       winff

DESCRIPTION

       This manual page documents briefly the winff command. This manual page was written for the Debian(TM) distribution because the original
       program does not have a manual page. Instead, it has documentation pdf format; see below.

       WinFF is a graphical user interface for the command line video converter ffmpeg. It runs ffmpeg from the command line. So, you just pick
       your files and it does the rest.

       WinFF doesn't actually convert any video files. It just runs ffmpeg. Therefore, It will convert any video file that ffmpeg will convert.
       Conversely, if ffmpeg will not convert the file, then WinFF will not either.

SEE ALSO

       For more details, you should have a look at the pdf manual, available at /usr/share/doc/winff/winff.pdf

AUTHOR

       This manual page was written by Paul Gevers <paul@climbing.nl> for the Debian(TM) system (but may be used by others). Permission is granted
       to copy, distribute and/or modify this document under the terms of the GNU General Public License, Version 3 or any later version published
       by the Free Software Foundation.

       On Debian systems, the complete text of the GNU General Public License can be found in /usr/share/common-licenses/GPL.

COPYRIGHT

       Copyright (C) 2008 Paul Gevers

								   june 14, 2008							  WINFF(1)
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