My $0.02. I've used the bit-ordering implied in the 'irrelevant' OP. 

>perl -wMstrict -le
"my $bits = unpack 'b*', pack 'N*', 0x01020304, 0x11121314;
 print qq{'$bits'};
 ;;
 $bits =~ s{ ((.) \2*) }
           { ($2 eq '1' ? '-' : '') . length($1) . ',' }xmsge;
 print qq{'$bits'};
 ;;
 my @n = map 0+$_, split /,/, $bits;
 print qq{@n};
"
'1000000001000000110000000010000010001000010010001100100000101000'
'-1,8,-1,6,-2,8,-1,5,-1,3,-1,4,-1,2,-1,3,-2,2,-1,5,-1,1,-1,3,'
-1 8 -1 6 -2 8 -1 5 -1 3 -1 4 -1 2 -1 3 -2 2 -1 5 -1 1 -1 3

[download]

Update: Maybe better: 

>perl -wMstrict -le
"my $bits = unpack 'b*', pack 'N*', 0x01020304, 0x11121314;
 print qq{'$bits'};
 ;;
 my @n =
   map { my $l = length;  chop eq '1' ? -$l : $l; }
   $bits =~ m{ 0+ | 1+ }xmsg
   ;
 print qq{@n};
"
'1000000001000000110000000010000010001000010010001100100000101000'
-1 8 -1 6 -2 8 -1 5 -1 3 -1 4 -1 2 -1 3 -2 2 -1 5 -1 1 -1 3

[download]

In reply to Re: Run length encode a bit vector by AnomalousMonk
in thread Run length encode a bit vector by Anonymous Monk

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