Sure, of course I’m familiar with the way NZB’s and the PAR2 issue; however, Sonarr appears to go by the published size which includes the PAR2’s. Therefore, the numbers I quote below will be based on that observation / quoting sizes with PAR2’s.
I can give you an example of where it breaks the intended functionality in my case, yes.
First, some background.
I only download episodes in SD. Recently, maybe 6 months ago, there was a change where some new release groups started putting out crap releases in smaller file sizes. For example, a one hour SD release is typically about 250 MB as published size (which includes PAR2’s on my indexers and is used by Sonarr to determine whether it should download). This is pretty consistent; however once in awhile a good one-hour release might be as low as 230 MB when including PAR2’s, which again, is the way it’s shown in Sonarr for my indexers when running a Sonarr manual search and watching the expression evaluation.
This 230 MB number is important because some of the crap releases would get up over 200 MB with PAR2’s, but they didn’t generally go over roughly 220 MB. Therefore, I had wanted to set the threshold to 225 MB, but I could only chose from 190 or 251, because of the 60-step you mention on a 1-hour episode.
If you think about that, 60 megabytes is a pretty big delta on a 230 MB target threshold. With HD it’s surely not a big deal, but at SD with the smaller x264 file sizes, it is an issue.
Just today I noticed Blacklist Ep 16 did not download because it was below the 251.66 threshold, yet it was a perfectly good/valid LOL release.
I could take it one step lower and go to 190 MB, but then I get the occasional bad release based on my experience when they first started showing months ago.
I wish I could remember some of the series/release group names I witnessed with the low-quality SD releases, but I can’t find them at the moment. I think one was something like 20-40 or something.
Anyway … short story long … if I were able to set with twice the granularity, it would work fine. Stepping 30 instead of 60, for example.
It would also eliminate the issue with 30-min South Parks not being downloaded, which is a very fine line, nearing the size of the bad releases (but still maintaining enough difference to use the rule as intended).