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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

subtitleeditor

SUBTITLEEDITOR(1)														 SUBTITLEEDITOR(1)

NAME

       subtitleeditor - Graphical subtitle editor with sound waves representation

SYNOPSIS

       subtitleeditor

DESCRIPTION

       This manual page documents briefly the subtitleeditor command. As subtitleeditor is a GUI program, most of its options are available
       through the GUI interface, rather than the command-line.

       subtitleeditor is a GTK+2 tool to edit subtitles. It can be used to create new subtitles or as a tool to transform, edit, correct and
       refine existing subtitles.

OPTIONS

       This program follows the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options is included
       below.

       -? --help
	  Show summary of options.

       --help-all
	  Show all help options

       --help-gst
	  Show GStreamer options

       --help-gtk
	  Show Gtk+ options

Application Options:
       -p --profile=NAME
	  the name of the profile used by the config

       -e --encoding=ENCODING
	  encoding used to open files

       -v --video=FILE
	  open video file

       -w --waveform=FILE
	  open waveform file

FEATURES

       * Really easy to use

       * Can create new subtitle

       * Can be used for timing (gstreamer)

       * Can be used for translation

       * Internal format is Advanced Sub Station Alpha

       * Can edit the script header (authors, translators, timers, video informations, etc.)

       * Style Editor

       * Framerate convertion

       * Scale

       * Split subtitle

       * Joint subtitle

       * Spell check using aspell

       * Encoding support

       * Edit text and adjust time (start, end)

       * Move subtitle

       * Find and replace (can use Regular Expression)

       * Remove empty lines

       * Set All end times

       * Can play video preview (using MPlayer or other)

       Supported Formats:

       * Sub Station Alpha

       * Advanced Sub Station Alpha

       * SubRip

       * MicroDVD

       * MPL2

       * MPsub (MPlayer subtitle)

       * SubViewer 2.0

       * Plain-Text

AUTHOR

       This manual page was written by Amaya Rodrigo Sastre <amaya@debian.org> for the Debian(TM) system. It was modified by Anibal Avelar
       <aavelar@cofradia.org>.

AUTHOR

       Amaya Rodrigo
	  Author.

COPYRIGHT

       Copyright (C) 2006 Amaya Rodrigo Sastre
       Copyright (C) 2008 Anibal Avelar

								 October 29, 2006						 SUBTITLEEDITOR(1)
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