I always upload FLACs to SoundCloud (and have for a couple years since they enabled lossless audio) so I think you're golden on the encoding robustness. Also, I almost never use the same source as the spreadsheet (and use a ton of SBDs, which aren't on the spreadsheet), so it seems you're golden on different sources as well. Would be cool to characterize the failures - I can likely tell you why they failed, given a list...

Also it would be fantastic to get the track timings for all past MJMs - I have many of them in text files but the data are a mess and not necessarily accurate (for reasons I won't elaborate on here only because it's not that interesting lol), and have long thought about crowdsourcing an effort to annotate them all ... but your tool would make this trivial and I could just add a column to the results spreadsheet, linking back to phish.in (which began with the set of spreadsheet sources but has diverged a bit over the years).

Really cool stuff, thanks for sharing