Netflix has completed a worldwide technology upgrade that improves video quality for Premium subscribers viewing 4K HDR titles. The move is being hailed as welcome news in the wake of a price hike to $22.99 from $19.99 for U.S. Premium customers. Netflix used the “dynamic optimization” video encoding method to implement an HDR variant of the company’s VMAF (Video Multimethod Assessment Fusion) quality metric. The new HDR-VMAF is the result of a collaboration between Netflix and Dolby Laboratories that employs “subjective tests with 4K HDR content using high-end OLED panels,” according to Netflix. Continue reading Netflix Uses Deep Learning to Optimize Streaming in 4K HDR

After comparing 5,000 streaming clips from 500 titles using x264, x265, and libvpx codecs, Netflix found x265’s implementation of HEVC to be the most efficient while offering the highest quality. However, “whether that matters in light of compatibility and licensing issues isn’t so obvious,” notes Streaming Media. The study, which focused on VOD rather than live, compared codecs and not specifications (instead of comparing encoding specs, Netflix compared implementation of the specs). “Netflix’s tests clearly show that x265 is 20 percent more efficient than libvpx when encoding premium content using the most stringent settings, and measuring quality with VMAF.” Continue reading Netflix Video Codec Study Finds x265 More Efficient Than VP9