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To find if our video file has a PGS or VOBSUB video track, we first need to find what subtitles are available in the video file:
ffprobe video.mkv 2>&1 | grep Subtitle
This will generate something like this:
Stream #0:3(eng): Subtitle: subrip (srt) (default) (forced) Stream #0:4(eng): Subtitle: subrip (srt) Stream #0:5(eng): Subtitle: subrip (srt) (hearing impaired) Stream #0:6(dut): Subtitle: subrip (pgs)
We're looking for a Dutch (dut) PGS subtitle, so that would be stream #0:6 in this example.
Now we can extract this PGS subtitle as a SUP file:
ffmpeg -i filename.mkv -map 0:s:6 -c:s copy -f sup output.sup
(here "0:s:6" stands for stream #0:6 - the pgs subtitle we want)
No you can use Subtitle Edit (only available for Windows, so you will need a virtual machine or a Windows PC) to convert this with OCR to a plain text SRT.
