LS,

i updated samtools on my gentoo box using ethe lastest release the
portage tree in to test CRAM support and ran some test 


I used a random BWA alignment filewhich have been sorted and indexed
using samtools and noticed that two variables in field nr 12 the OPT
variable OPTional fields in the format TAG:VTYPE:VALUE have changed.
After converting the BAM file to a CRAM file and back to BAM

To be more precise: MD:Z:42 changed to MD:Z:0N4 and NM:i:0 changed to
NM:i:1 are the OPT variables that that changed. Also the format of the
line is somewhat crippled.


version:

samtools --version
samtools 1.0
Using htslib 1.0
Copyright (C) 2014 Genome Research Ltd.


original entry
HWI-ST220:133:B06F8ABXX:6:1203:19625:16148      0       chr1    10000
0       42M     *       0       0
ATAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACC      
;BBFFFFFGHHHHJJJJJJJJJIJJJ>FGGHHJIIJIIGGGI      MD:Z:42 NM:i:0  XT:A:U  XN:i:1  
X0:i:1  X1:i:581        XM:i:0XO:i:0   XG:i:0


and


processed entry:
HWI-ST220:133:B06F8ABXX:6:1203:19625:16148      0       chr1    10000
0       42M     *       0       0
ATAACCCTAACCCTAACCCTAACCCTAACCCTAACCCTAACC      
;BBFFFFFGHHHHJJJJJJJJJIJJJ>FGGHHJIIJIIGGGI      XT:A:U  XN:i:1  X0:i:1  
X1:i:581        XM:i:0  XO:i:0  XG:i:0MD:Z:0N41        NM:i:1


Is this intended or is this a bug ?

best KJF


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