Terrible
Response from developer
Dear user, conversions in my app are based on number of frames and made in two steps: (1) 1:00:00:00 [23.98 NDF] => 86400 frames (2) 86400 frames => 00:48:00:00 [29.97 NDF] So, it works in a similar way as for example here: https://www.cinelexi.com/tc-convert