Don't treat unknown subtitle codecs as an unrecoverable error (regression in [564])
Don't treat unknown subtitle codecs as an unrecoverable error (regression in [564])

MaddTheSane/perian,MaddTheSane/perian,MaddTheSane/perian,JanX2/Perian,JanX2/Perian,MaddTheSane/perian,JanX2/Perian,MaddTheSane/perian,JanX2/Perian,JanX2/Perian,MaddTheSane/perian