In one example, an action scene hit 17.2 Mb/s. for a 4K animation title episode" but Netflix noted that some scenes will also exceed 16 Mb/s bitrate, which used to be the maximum bitrate for 4K. One extreme example is "showing the new highest bitrate to be 1.8 Mbps. Other advantages of the new approach include "higher initial quality", "fewer quality drops while streaming", less rebuffering, and a reduction in "initial play delay by about 10%", according to the company. For members with constrained bandwidth we deliver higher quality at the same (or even lower) bitrate." "For members with high-bandwidth connections we deliver the same great quality at half the bitrate on average. Meaning, on average we need 50% less bitrate to achieve the same quality with the optimized ladder," the company said in a blog post. "Computing the Bjøntegaard Delta (BD) rate shows 50% gains on average over the fixed-bitrate ladder. Netflix claims that its new encoding approach can cut bitrates for 4K video in half without affecting picture quality. These principles have been applied to SD/HD resolution and 8-bit video only but are now also being rolled out for 4K, HDR (High Dynamic Range) and HFR (High Frame Rate) streams, the company said.
Netflix has been using per-title or per-shot encoding for a few years now, meaning that it takes the type of content or scene into consideration when encoding the content. The company is currently reencoding its 4K library with a focus on optimizing bitrate. Netflix is reencoding 4K streamsWhile Apple TV+ has set new standards for video streaming quality with 4K streams exceeding 40 Mb/s bitrate at times, Netflix is moving in the other direction. The company claims to be able to deliver same quality 4K video at half the bitrate. Netflix is reencoding all 4K, HDR and HFR titles in its catalog.
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