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Hey #FFMPEG users! I know you can specify extracting #subtitles by language with a command like:

-map 0:s:m:language:eng

But how do you specify by FORMAT or CODEC like VTT/SRT?

I have files with english SRTs and english PGSes and I want to specify eng lang but not #PGS. Currently I know most of them are PGS as #subtitle index 2 so I do:

-map 0:s:m:language:eng -map -0:s:2

and that works, but I'd much rather something like:

-map 0:s:m:language:eng -map -0:s:m:format:pgs

Ideas?