Definitions for "I-Frame"
Keywords:  mpeg, intra, frame, motionjpeg, doesnt
The MPEG compressed video frame where redundancy between adjacent frames is not taken into account, only the information I a single frame is compressed. It is used in conjunction with the B (bi-directional) and P (predictive) frame encoding. If frames are lost during MPEG decoding, the decoder cannot fully recover until the next I frame comes along. The frequency of I-frames in a sequence determines how long it takes to get a reasonable picture after a random access or loss of data.
A.k.a. intra pictures, I-frame is typically the first frame of each GOP (apart of video compression technology used by MPEG), is moderately compressed, and serves as the reference points for random access and can be likened to images.
In inter-frame compression schemes (e.g., MPEG), the key frame or reference video frame that acts as a point of comparison to p- and b-frames, and is not rebuilt from another frame. Opposite B frame and P frame.
a picture that contains the most information that can be held in a picture using that codec