Interlacing
Interlacing (Field-Based Video)
A legacy video scanning technique that displays each frame as two interleaved fields (odd lines first, then even lines), originally designed to reduce flicker on CRT displays while halving the bandwidth requirement.
技術的詳細
Interlaced video (denoted as 1080i, 480i) splits each frame into two fields captured at slightly different times. On progressive displays (all modern screens), interlaced content shows visible artifacts: combing (horizontal lines visible on moving objects) where the two fields captured at different moments create a striped pattern. Deinterlacing algorithms convert interlaced to progressive: bob (displays each field as a full frame, doubling frame rate), weave (combines fields, visible combing on motion), and adaptive (detects motion areas and applies appropriate method per pixel). FFmpeg's yadif and bwdif filters are common deinterlacing solutions.
例
```html <!-- Interlacing: HTML5 video with format fallback --> <video controls preload="metadata"> <source src="video.webm" type="video/webm; codecs=vp9,opus"> <source src="video.mp4" type="video/mp4"> Your browser does not support HTML5 video. </video> ```