I have a program called riffstation who can recognize chords by mp3s and mp4s but it doesn’t show the videos. Could Qmidi work that way... recognizing chords by mp4 karaoke and showing the video to read the words? it would be great!!!!
Have you tried something like Rogue Ameoba's Loopback?
It strikes me you could take the audio output from QMIDI, and before it gets sent out to the audio outputs, route it through the chord recognition program...