Play back of DTS embedded MCH music flac files does not work

When trying to play back DTS embedded MCH music Flac files with the Z9X, my Yamaha AV processor outputs only noise.
Does anyone have an idea why Music Player does not allow this?
My Oppo-Player both do this.

 

I had some DTS files embedded in WAV files, which played on the UHD3000, but not reliable. Sometimes i also had only noise.

I gave up and converted all dts wav files in a directory to normal flac with this command:
forfiles /P "directory" /M *.wav /c "cmd /c ffmpeg -i @file -compression_level 8 @fname.flac"

 

Where exactly did you type in the command?
Are you running a windows machine?

 

Yes, on windows. The conversion makes the files bigger, but they play.

 

Sorry, I do not quite understand. Are running a dedicated software for the conversion?

 

The software is the command line tool ffmpeg. I start cmd and change to the directory of the ffmpeg program.