DTS and AC3 decoding is audio decoding, while mpeg4 is video decoding Simply put, if there is no AC3 decoding, then almost all DVDS you will not hear the sound, all AC3 decoding is required, and DTS is usually also required, DTS is better than AC3, but only some DVDS have DTS audio tracks. In addition to about 100 yuan disc drive, this is also all mpeg4 decoding that DVD player can play on the computer more common mpeg4 format movie, this only the so-called mpeg4DVD will have, according to your own needs to choose whether to choose between these three decoding there is no so-called good or bad, my statement is, AC3 and DTS must have, mpeg4 has the best, no matter