Where to get the correct codecs? Proper - place where there is everything - XDA forum.
If you like to watch movies on devices with Android probably faced the problem when your favorite video player says: "This audio format (AC3) not supported". This happens with some types of files that use certain codecs. If earlier, for example, Mx Player easily opened all formats without problems, now the codecs must be installed separately. While we often hear that those codecs, which offers Mx Player for download from Google Play Store are not suitable.