[FFmpeg-user] Strip all formatted entries from an ssa or srt stream

[bbb]

Hi,

I'm still improving my automatically added fallback subtitle stream. My 
TV doesn't cope well with formatted or positioned entries. They just 
result in a bunch of numbers and codes that fill the entire screen so 
that no meaningful part of the subtitles is visible any more. All those 
subtitle creators who mean well by translating signs in place or trying 
to sync the colour of some song lyrics are making it a pain for me to 
watch those subtitles on my TV.

I would like to be able to strip all formatted or positioned parts of 
the subtitles, so that only the speech translations remain. I already 
have an idea how to approach that, but I thought maybe somebody already 
come up with a solution that I can use or adapt.

  Kind regards,
Nils