Hello John,

On 05/11/15 21:49, John Marshall wrote:
> Hello Michael,
>
> On 5 Nov 2015, at 16:56, Michael Nuhn <mn...@ebi.ac.uk> wrote:
>> I am using samtools 1.2. When I run the index command like this:
>>
>> /software/ensembl/funcgen/samtools index
>> /lustre/scratch109/ensembl/funcgen/mn1/problem_bam/HEL9217:hist:BR2_WCE_3526_bwa_samse_1.unfiltered.bam
>>
>> samtools instantly terminates and generates no output. The exit code
>> does not indicate a failure
>
> The lack of error reporting here is something that has been improved since 
> 1.2.  Samtools built from the current develop branch reports for this file:
>
>       [bam_index] corrupted or unsorted input file
>
> and exits with failure.  This was 
> https://github.com/samtools/samtools/issues/362 .

Ok, cool, I have to try that.

>
>> -rw-r--r-- 1 mn1 ebiusers 34G Nov  5 11:20
>> /lustre/scratch109/ensembl/funcgen/mn1/problem_bam/HEL9217:hist:BR2_WCE_3526_bwa_samse_1.unfiltered.bam
>>
>> and has headers and alignments in it. The bam file is generated by picard.
>
> In this case, I suspect the problem is that your file is actually a SAM file! 
>  This can't be indexed with samtools index, and I'll change the message for 
> this case to make it easier to diagnose.  (A bgzipped SAM file could be 
> indexed with tabix, but unfortunately such an index can't be used with 
> "samtools view FILE REGION".)

Indeed it is! Thanks, that explains a lot.

Cheers,
Michael.


>      John
>

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