Group of pictures. Defined as a sequence of video frames subject to compression encoding under the MPEG-2 standard. A GOP is characterized by one of the following: At least one I-frame, a frame having no reference frame for prediction One or more P-frames, frames based on a previous frame B-frames, frames based on two reference frames, one previous and one afterwards The SGI Media Server MFCODEC supports four distinct MPEG-2 GOP structures: I, IP, IPB,and IPBB.
Specific segment of MPEG video bitstream. From time to time, an entire spatially compressed input picture needs to be sent by MPEG encoder to the decoder, with no prediction involved. These are I (intra) pictures.
A GOP is the atomic unit of MPEG video access. In MPEG video, a GOP is one or more I-pictures followed by P-pictures and B-pictures. GOPs are limited in DVD-Video to 18 frames for 525/60 and 15 frames for 625/50.
A MPEG compression technology, the GOP concept reduces the temporal redundancy across frames (from frame to frame) for video content and consists of I, B, P frames. Video contents is streamed on a network. Bitrate is usually measure in kilobytes per second (Kbps), for example 28.8 Kbps.
Group of Pictures. MPEG video streams are made of sequences of 8–24 frames; each of these sequences is a GOP. A GOP has a single still image (the I frame). Other frames which complete the appearance of movement are created in relation to the I frame: a P frame refers only to the frame before it, while a B frame refers to the frames before and after it. By minimizing the amount of data required to create these frames, the MPEG file can be compressed substantially. An open GOP can also refer to an I frame from a prior GOP, while a closed GOP has no references to any prior GOPs.