BCFTOOLS filter per sample per variant

Question

[Filago]

Hello, I have a multi-sample VCF-file and want to filter out variants in single patients based on the ratio of certain quality values (which are sample specific and annotated in the FORMAT-field)

So I filtered my data like this:

bcftools view  file.vcf.gz -i '(FORMAT/quality_value1)/(FORMAT/quality_value2) > 10' -o file_flt.vcf.gz -Oz

However, this step filtered whole variants instead of single sample variant calls. Any ideas about this issue?

Best, Andreas