[FFmpeg-user] proper metadata key=value for default/nondefault subtitles

[Roger Pack]

> But how to set whether the stream is on by default?  The  subtitle stream has
> the default flag, and ffmpeg recognizes it.  I've tried to turn it off with
> default=0, default=no, with and without quotes,
> default-flag, flag-default.  Whatever I've tried just gets listed as a
> metadata item, but doesn't change the actual attribute as listed on the
> Stream # line.  Does anyone know the proper key and value, or whether
> it is even possible in ffmpeg?
> Thanks

So basically you want to tweak the file so that its subtitle stream is
set to default "on"?
-r