Movian

MPL is just the early simplified version of SUB format. Timestamps use [] brackets instead of {} in SUB format.
Example: http://dl.opensubtitles.org/en/download/filead/src-api/vrf-18a853e962/1953220719.gz

To add MPL support to ST just change in ext_subtitles.c following function:

static int
get_sub_timestamp(const char *buf, int *start, int *stop)
{
  const char *b = buf;
  if((*b != '{') && (*b != '['))
    return -1;
  *start = strtol(b + 1, (char **)&b, 10);
  if(((b[0] != '}') || (b[1] != '{')) && ((b[0] != ']') || (b[1] != '[')))
    return -1;
  *stop = strtol(b + 2, (char **)&b, 10);
  if((b[0] != '}') && (b[0] != ']'))
    return -1;

  return b + 1 - buf;
}