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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

ffmpegthumbnailer

FFMPEGTHUMBNAILER(1)					      General Commands Manual					      FFMPEGTHUMBNAILER(1)

NAME

       ffmpegthumbnailer - fast and lightweight video thumbnailer

SYNOPSIS

       ffmpegthumbnailer [options]

DESCRIPTION

       Ffmpegthumbnailer  is  a  lightweight  video  thumbnailer  that can be used by file managers to create thumbnails for your video files. The
       thumbnailer uses ffmpeg to decode frames from the video files, so supported videoformats depend on the configuration flags of ffmpeg.

OPTIONS

       -i<s>  : input file

       -o<s>  : output file

       -s<n>  : thumbnail size (use 0 for original size) (default: 128)

       -q<n>  : image quality (0 = bad, 10 = best) (default: 8) (only for jpeg)

       -c<s>  : override image format (jpeg or png) (default: determined by filename)

       -t<n|s>
	      : time to seek to (percentage or absolute time hh:mm:ss) (default: 10%)

       -a     : ignore aspect ratio and generate square thumbnail

       -f     : create a movie strip overlay

       -h     : display this help

AUTHOR

       Written by Dirk Vanden Boer.

REPORTING BUGS

       Report bugs to <http://code.google.com/p/ffmpegthumbnailer/issues/list>

COPYRIGHT

       Copyright (C) 2008 Dirk Vanden Boer <dirk.vdb@gmail.com>
       This is free software.  You may redistribute copies of it under the  terms  of  the  GNU  General  Public  License  (version  2	or  later)
       <http://www.gnu.org/licenses/gpl.html>.	There is NO WARRANTY, to the extent permitted by law.

															      FFMPEGTHUMBNAILER(1)
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