sub.ImageFile: Shitty fix for random access in PGS
sub.ImageFile: Shitty fix for random access in PGS

Hope that decoding the previous ten subtitles is always sufficient.

VOBSUB doesn't have this problem.

vapoursynth/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth,Kamekameha/vapoursynth,Kamekameha/vapoursynth,Kamekameha/vapoursynth,vapoursynth/vapoursynth,vapoursynth/vapoursynth