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01 ·Video Codecs·★ MEMBER·10 min read Motion Compensation from Scratch — Where 90% of Video Compression Happens What decides where a video codec's bits go isn't the transform or the quantizer — it's the prediction at the front door. What block matching actually minimizes, why motion vectors are not object motion, and how P/B reference structures and GOP boundaries turn into real streaming failures. 02 ·Video Codecs·★ MEMBER·8 min read Video Compression from Scratch — Motion Compensation and the GOP Compressing thirty separate photographs a second gets nowhere near today's delivery bitrates. Why frame differencing breaks, what a motion vector actually carries, I/P/B frames and the GOP, and what CBR, VBR and CRF each hold constant — ending at the keyframe interval a delivery engineer has to choose.