I often have to convert sample rates or file formats of huge amounts of sound effects from one type to another. What is your favourite batch audio file converter? For a long time I’ve used Barbabatch, but that hasn’t been updated in ages with modern formats. I also use Soundminer’s mirror function at times or SoundConverter.
What app do you like? Bonus points if works with FLAC or other open formats.
Wavelab. Super solid for me when converting thousands of speech files on EA’s NHL game and in my own work with sfx and music for games. Great renaming functions and also batches sessions too which is pretty helpful. Haven’t done much work with FLAC but it should support it. I’ve also used Awave Studio when needing to convert more unique formats (around 300 supported). Awave isn’t cross-platform but might run under Wine on the Mac.
I’ve been hearing good things about Myriad from Audiofile Engineering.
To add even more options :
The batch file/item converter in Reaper should do exactly what you want but if you prefer dedicated applications you can try Myriad on macOS or AudioBot on Windows. SoX is also a great open source alternative (the sample rate converter is particularly renowned) but this is for people who love the command line.