Which of the following is not an image type used in MPEG? a .A frame b.B frame c.D frame d.P frame
The correct answer is option 1. Key Points A group of pictures can contain the following picture types: I picture or Iframe (Intra coded picture) – a picture that is coded independently of all other pictures. Each GOP begins (in decoding order) with this type of picture. P picture or P frame (predictive coded picture) – contains motion-compensated difference information relative to previously decoded pictures. Each P picture can only reference one picture, and that picture must precede the P picture in display order as well as in decoding order and must be an I or P picture. B picture or B frame (bi-predictive coded picture) – contains motion-compensated difference information relative to previously decoded pictures. Each B picture can only reference two pictures, the one which precedes the B picture in display order and the one which follows, and all referenced pictures must be I or P pictures. D picture or D frame (DC direct coded picture) – serves as a fast-access representation of a picture for loss robustness or fast-forward. D pictures are only used in MPEG-1 video. ∴ Hence the correct answer is A-frame.
