I've looked over the audio that Ben Roth linked in his post [230516
MMDigest]:

> https://youtu.be/8hcdoIYJcFk
 
> Tchaikovsky - Francesca da Rimini for two pianos -
> Ludmila Berlinskaia & Arthur Ancelle

I don't believe that it is going to convert well at all, and it might
be unrecognizable. I've found that piano duets don't convert well
either because notes sometimes overlap causing the program to get
confused.

I would recommend using the score and making a MIDI file from that;
it would be much more efficient than transcribing the [YouTube]
performance using the audio to MIDI procedure.

Piotr Barcz