How to 'soft-embedd' subtitles with python-ffmpeg

[Pavel_47]

Hello,

I've found an example on how to embed subtitles using ffmpeg from command line:
ffmpeg -i video.mp4 -i subtitles.srt -map 0:v -map 0:a -c copy -map 1 -c:s:0 mov_text -metadata:s:s:0 language=fra output.mp4

This way subtitles are embedded as metadata ... quite rapid process.

Because I need to embed subtitles in multiple files I searched a solution that uses Python.
Indeed such a solution exist: ffmpeg-python 0.2.0

But I didn't find example how embed subtitles as metadata, i.e not burn them in video.
The only example on embedding subtitles I've found is here:

import ffmpeg
input_dir = 'mydir/'
video_file = 'video.mp4'
subtl_file = 'subtitles.srt'

(
    ffmpeg
    .input(input_dir+video_file)
    .filter('subtitles', input_dir+subtl_file)
    .output(input_dir+'output.mp4')
    .run()
)

But this way subtitles are burned into video ... quite time-consuming process.

Any suggestions ?

Thanks.