Update video audio types mp3,mkv,mp4,webm, update with capital extensions

Getting results :
application/octet-stream
application/octet-stream
application/octet-stream
application/octet-stream

for all of my codes:
System.out.println(MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType("/usr/lo.cal/myfile.mp3"));
System.out.println(MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType("/usr/lo.cal/myfile.mkv"));
System.out.println(MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType("/usr/lo.cal/myfile.mp4"));
System.out.println(MimetypesFileTypeMap.getDefaultFileTypeMap().getContentType("/usr/lo.cal/myfile.webm"));