This is the same error, under different circumstances. So far I have found Media Center an excellent product, but this problem is driving me crazy.
Using v 15.0, even updated to the latest version of this today, I cannot convert .wav to .flac files in situ with the "use ogg as transport layer" option turned off.
When I Start the conversion, I get the same response, i.e.
"Failed to convert 11 files.
Please ensure that your files exist, and are of a supported audio format."
and the directory that contains the .wav files to be converted to .flac now contains an additional 11 files of the form "Temporary Convert File 764.ogg".
Is this option supposed to work? or do I have to do the conversion to .flac using the ogg transport layer to retain the associated metadata for each audio file in Media Center, then use another 'straight' .wav -> .flac converter, and then replace the 'ogg transport layer' .flac files with these?
Have I missed something in the documentation or forums, or has this option never worked?