I gave up and wrote some perl to do it: 
  
 
#!/usr/bin/perl
# Splits a ".pic" file created by a Hikvision camera
# into single jpeg files
if (! (${file}=$ARGV[0]) ) {
 print "Usage: $0 filename\n"; exit 1;
}
open FILE, ${file};
while (<FILE>){
${jpeg} .= $_;
}
close ${file};
${index}=0;
while ( index(${jpeg}, "\xFF\xD8") != -1  ) {
 $start = index(${jpeg}, "\xFF\xD8");
 $end = index(${jpeg}, "\xFF\xD9");
 ${singlejpeg} = substr(${jpeg}, $start, $end);
 ${jpeg} = substr(${jpeg}, $end+1);
 open (OUTFILE, ">${file}_${index}.jpg");
 print OUTFILE ${singlejpeg};
 close OUTFILE;
 ${index}++;
}