Adapter

 

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Combine an FFmpeg powered back-end with VLC rendered previews, then add in file size estimation, a gorgeous user interface and make it entirely free. That is Adapter – the ultimate converter app for Mac and PC.

 

(Enough of the sales-speak. This is one of my favourite Mac apps of all time. Installed across our school on every Mac, this is an absolute essential!)

https://www.macroplant.com/adapter/