[FFmpeg-user] How to use drawtext to overlay dynamic text

[Zack Thevenot]

Thanks.  I really like the subtitles idea, but I'm having trouble getting the subtitles to show. I'm trying both filtering and muxing but nothing is showing.

ffmpeg -i input.mp4 -vf subtitles=sub.srt out.mp4
ffmpeg -i input.mp4 -i sub.srt -codec copy out.mp4


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I'm attaching some log files so maybe you can see whats wrong.  My subtitle files are SubRip format, but I'm also converting them to .ass and trying those as well


On Wednesday, June 11, 2014 2:22 PM, Zack Thevenot <zack924 at yahoo.com> wrote:
 


Thanks.  I really like the subtitles idea, but I'm having trouble getting the subtitles to show. I'm trying both filtering and muxing but nothing is showing.

ffmpeg -i input.mp4 -vf subtitles=sub.srt out.mp4ffmpeg -i input.mp4 -i sub.srt -codec copy out.mp4 


On Wednesday, June 11, 2014 1:11 PM, Lou <lou at lrcd.com> wrote:
 


On Wed, 11 Jun 2014 10:57:50 -0700 (PDT)

Zack Thevenot <zack924 at yahoo.com> wrote:

> 
> 

> I am trying to find a way to use filters to draw dynamic text in the
> same location on my video.  I understand how to draw static text for a
> certain duration, so my plan was to chain multiple of these filters
> together to make a dynamic text overlay, but I didn't find a way to do
> two or more drawtext filters. What is the best way to do something
> like this?  Any help is greatly appreciated.
> 
> This is the command
 I have so far to make static text
> 
> ffmpeg -i input.h264 -vf
> "drawtext=enable='between(t,0,60)':fontfile=/Windows/Fonts/Tahoma.ttf:fontcolor='White':
> text='100'" -acodec copy output.h264

You can make a linear chain of multiple filters by separating them with
a comma:

  -vf "drawtext,drawtext"

See <http://ffmpeg.org/ffmpeg-filters.html#Filtergraph-syntax-1>

An
 alternative and possibly easier method would be to make an ASS or SRT
subtitle and use the ass or subtitles filters to make hardsubs:

  -vf "subtitles=subtitles.srt"

See:
http://ffmpeg.org/ffmpeg-filters.html#subtitles
http://ffmpeg.org/ffmpeg-filters.html#ass
https://trac.ffmpeg.org/wiki/HowToBurnSubtitlesIntoVideo

Or mux the subtitles if you prefer softsubs:

ffmpeg -i video.mkv -i subtitles.ass -codec copy output.mkv

aegisub is an easy to use tool to make such subtitles.
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I'm attaching some log files so maybe you can see whats wrong.  My subtitle files are SubRip format, but I'm also converting them to .ass and trying those as well
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