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.

[snippsat]

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

Any suggestions ?

It take 30-sec to embedding subtitles in what i use in other Thread also MKVToolNix(with Subtitle Edit if need transparent to .ass).

[Pavel_47]

It take 30-sec to embedding subtitles in what i use in other Thread also MKVToolNix(with Subtitle Edit if need transparent to .ass).

It also takes about 30 seconds for ffmpeg to embed the subtitles.
Does MKVToolNix allow batch processing, i.e. specify the directory containing multiple videos with corresponding subtitle files, then press a button and see the result after 3...5 min?