Converting hdmv_pgs_subtitle to image sequence

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Converting hdmv_pgs_subtitle to image sequence

Markus Amalthea Magnuson
I'm trying to convert an hdmv_pgs_subtitle stream in a .sup file to a
sequence of images, one for every new subtitle in the stream. Running the
following will output a huge number of images of varying size, but they are
all corrupt:

ffmpeg -i test.sup -scodec copy test_%04d.png

Is this conversion from bitmap subtitles to images supported?
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