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There can be multiple frames, with non-zero duration (for animation) or with zero duration (for e.g. editing layers in graphics software or multi-page documents). Frames can be smaller or larger than the image canvas and can be blended in various ways. However, regular video codecs are still preferred for encoding realistic moving content.
Three types of pictures (or frames) are used in video compression: I, P, and B frames. An I‑frame (intra-coded picture) is a complete image, like a JPG or BMP image file. A P‑frame (Predicted picture) holds only the changes in the image from a previous frame. For example, in a scene where a car moves across a stationary background, only the ...
D frames are only used in MPEG-1 video. An I frame indicates the beginning of a GOP. Afterwards, several P and B frames follow. In older designs, the allowed ordering and referencing structure is relatively constrained. [4] The I frames contain the full image and do not require any additional information to reconstruct them.
Intra-frame coding is a data compression technique used within a video frame, enabling smaller file sizes and lower bitrates, with little or no loss in quality. Since neighboring pixels within an image are often very similar, rather than storing each pixel independently, the frame image is divided into blocks and the typically minor difference between each pixel can be encoded using fewer bits.
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iFrame video and audio is encoded using lossy compression. Only intraframe compression is enabled; every frame is a stand-alone i-frame. Video is encoded with the AVC/H.264 compression scheme. Audio is encoded with the AAC codec. The compressed audio and video are multiplexed into a QuickTime file.
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Sometimes in interlaced video a field is called a frame which can lead to confusion. [3] To increase the resolution of video images, new schemes have been created that capture full-frame images for each frame. Video composed of such frames is called progressive scan video. Video shot with a standard video camera format such as S-VHS or Mini-DV ...