Use of timeseries_filter preprocessor

[mo-abodas]

Hi, I'm trying to calculate sliding annual means from monthly mean data, but I haven't managed to get it to work. The units of the time coordinate of the input data are "days since 2000-03-01 00:00:00". According to the documentation, I have to specify the span and window in the same units as the time coordinate.
If I use days:

timeseries_filter:
      window: 365
      span: 1825
      filter_type: lowpass
      filter_stats: mean

then it fails with IndexError: Cannot index with zero length slice.

If I use months:

timeseries_filter:
      window: 12
      span: 60
      filter_type: lowpass
      filter_stats: mean

then it doesn't fail but the results are not filtered.
Any ideas about what I'm doing wrong? Thanks!

[bouweandela]

Could you please post a more complete version of the recipe that you're trying to run? You can rename it so it ends with .txt if GitHub doesn't allow uploading it. That will make it easier to reproduce the issue.