Pros and Cons of Shot-Based Encoding
Learn more about per-title encoding at 流媒体的下一个事件.
Watch 1月时's complete presentation from 流媒体 East 2019, T103. A Survey of Per-Title Encoding Technologies, 在 流媒体 Conference Video Portal.
Read the complete transcript of this clip:
1月时: If you have one easy-to-compress segment, you have a very low bitrate. If the next one is a high motion segment, you can up the bitrate. The viewer is not going to notice any difference 在 encoding because it happens at a scene change. Whereas if you--we've all seen a keyframe 在 middle of a scene where that was noticeable because either it was a higher-quality frame or the encoding was different--that's something you eliminate with the shot-based encoding.
Netflix's point is that they don't have to use CBR or VBR, they can use QP-based encoding if they want to within a segment because it's just not that important. 好吧, 这是Netflix的数据, they call this dynamic optimization, and they found significant bitrate reductions. They're saying they're saving 17% bitrate and increasing the VMAF score by 3.7分. 3.7分 is very significant, particularly 在 context of a 17% data rate reduction.
它不依赖于编解码器. We're seeing bandwidth savings here for H.264, VP9, 和HEVC, and they're all quite significant, whether you measure them with VMAF or whether you measure them with PSNR. And again, this is a situation where traditional bitrate techniques don't apply. If this makes you nervous, shot-based encoding may not be for you. If you're okay with this, then it's a pretty good technology.
另一个问题是, I'm not aware of any third-party vendors offering shot-based technology at this point, so if you want it you're gonna have to make it yourself.
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