Differences Between H.261 and MPEG-1

Differences Between H.261 and MPEG-1

 * H.261 only encodes video. MPEG-1 encodes video and audio.
 * MPEG-1 allows arbitrary sized video (multiples of 16), but H.261 only allows 352 x 288 and half that size.
 * H.261 only allows forward prediction. MPEG-1 has forward and backward prediction (B-pictures).  D-pictures are also only in MPEG-1.