Hi,

I am upgrading an analysis from samtools version 0.1.19-44428cd to version 
1.3.1 (using htslib 1.3.1). I am trying to understand why the pileup changes so 
much in this example

samtools mpileup -s -f genomes/NC_000962.fna alignments/sample-1.bam | head
[mpileup] 1 samples in 1 input files
<mpileup> Set max per-file depth to 8000
NC_000962.3     1       T       13      ^],^],^],^],^],^].^].^].^].^].^].^],^], 
;GF/GGGGGBCDH   ]]]]]]]]]]]]]
NC_000962.3     2       T       13      ,,,,,......,,   ?GFF?GDGGBGGA   
]]]]]]]]]]]]]
NC_000962.3     3       G       13      ,,,,,......,,   DGFFDGHGHFHGG   
]]]]]]]]]]]]]
NC_000962.3     4       A       13      ,,,,,......,,   DGFFGGEGHAGGE   
]]]]]]]]]]]]]
NC_000962.3     5       C       13      ,,,,,......,,   GGADDHDHHGHGE   
]]]]]]]]]]]]]
NC_000962.3     6       C       15      ,,,,,......,,^],^].     GGGBFHGHHGBGHFA 
]]]]]]]]]]]]]]]
NC_000962.3     7       G       15      ,,,,,......,,,. ;GFFGCGGGEGHHG3 
]]]]]]]]]]]]]]]
NC_000962.3     8       A       15      ,,,,,......,,,. 0FGFG2GGGAGHGF> 
]]]]]]]]]]]]]]]
NC_000962.3     9       T       15      ,,,,,......,,,. CGGF0ECGGEGHCAA 
]]]]]]]]]]]]]]]
NC_000962.3     10      G       15      ,,,,,......,,,. ?GGFEEGGGECGG.A 
]]]]]]]]]]]]]]]

./samtools-1.3.1/samtools mpileup -s -f genomes/NC_000962.fna 
alignments/sample-1.bam | head
[mpileup] 1 samples in 1 input files
<mpileup> Set max per-file depth to 8000
NC_000962.3     1       T       0
NC_000962.3     2       T       0
NC_000962.3     3       G       0
NC_000962.3     4       A       0
NC_000962.3     5       C       0
NC_000962.3     6       C       1       ^],     A       ]
NC_000962.3     7       G       1       ,       3       ]
NC_000962.3     8       A       1       ,       >       ]
NC_000962.3     9       T       1       ,       A       ]
NC_000962.3     10      G       1       ,       A       ]

Is this change a change in the default settings somewhere such that the reads 
are filtered out?

Thanks

Adam



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