After many hours of experimentation...
 

....with literally dozens of software programs...

....the one program I've found that really "converts" videos from one
format into another without a loss of quality or sound is...

....Movavi Video Convert.

The toughest test I tried was converting *.wmv files to *.avi files. My
freestanding DVD players will play *.AVI files, but not .WMV files. Most
of the converters I tried had serious problems converting .WMV files,
and if they did convert the files, they "futzed around" a bit with the
final *.AVI file format, and their *.AVI files would not play in my DVD
players, either, or the sound would go out of sync.

But...the output files from Movavi work properly.



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