[FFmpeg-user] How to hardcode subtitles

[Moritz Barsnick]

On Mon, Mar 23, 2020 at 20:48:01 -0400, Andy wrote:
> There are 3 subtitles in the file, how do I choose the correct subtitles?
[...]
> Input #0, matroska,webm, from
> 'LImmortale.2019.BluRay.1080xH264.Ita.AC3.5.1.Sub.Eng.Ita.mkv':
>   Metadata:
>     title           : Encoded By realDMDJ
>     creation_time   : 2020-03-14 08:39:17
>     ENCODER         : Lavf58.20.100
>   Duration: 01:55:25.15, start: 0.000000, bitrate: 3249 kb/s
>     Stream #0:0: Video: h264 (Main), yuv420p(tv, bt709), 1920x1080 [SAR 90:67 DAR 160:67], 24 fps, 24 tbr, 1k tbn, 48 tbc (default)
>     Metadata:
>       DURATION        : 01:55:25.130000000
>     Stream #0:1(ita): Audio: ac3, 48000 Hz, 5.1(side), fltp, 448 kb/s (default)
>     Metadata:
>       title           : Surround
>       DURATION        : 01:55:25.152000000
>     Stream #0:2(ita): Subtitle: ass (default) (forced)
>     Metadata:
>       DURATION        : 01:47:24.380000000
>     Stream #0:3(ita): Subtitle: ass
>     Metadata:
>       DURATION        : 01:47:25.755000000
>     Stream #0:4(eng): Subtitle: ass
>     Metadata:
>       DURATION        : 01:47:25.755000000

Kindly check the nice documentation. The subtitle filter is documented
here:

https://ffmpeg.org/ffmpeg-filters.html#subtitles-1

There's even an example:
  To render the second subtitles stream from that file, use:
  subtitles=video.mkv:si=1

Cheers,
Moritz